centering workpiece on rotary table pricelist

Most small rotary tables have some sort of center hole, sometimes with a cylindrical bore but often with a Morse taper. If the part you"re wanting to center has its own center hole, you might be able to make a plug that fits the rotary table center hole and the part center hole.

The more common way of centering a workpiece on a rotary table requires that you measure the difference between workpiece radii that are 180 degrees apart, and then adjust the workpiece location on the rotary table to split the difference. The most common tool used to make the measurements is a dial gage or dial indicator that must be held stationary; most often the dial gage is anchored to the machine spindle while the rotary table base is clamped to the table.

After you center the work on the rotary table by eye, set a dial indicator up to probe the reference surface. Adjust the indicator holder or move the table so that the dial gage plunger is pressed about half way into its range of travel before zeroing the indicator. Now turn the rotary table top and workpiece (as an assembly) a half turn before reading the dial gage.

Now you want to move the workpiece relative to the rotary table surface until the dial gage reads one-half of the second value. Let"s say your two dial gage readings are A. 0.000 inch, and B. 0.138 inch . . . you want to move the workpiece until the dial gage reads 0.069 inch at BOTH positions A and B.

Next, you need to repeat the measure-rotate 1/2 turn-measure-split the difference process at positions C and D, which must be on a line perpendicular to that connecting A and B.

Since it"s about impossible to move the part on the table exactly the right amount in the right direction, it"s vital that you recheck and readjust A and B after you adjust along C and D . . . and then you"ll need to check and readjust C and D again, and so on and so on. While you"re learning, it"ll seem like you"re chasing your tail, but it is a skill you"ll learn.

To reiterate, the important part is that when adjusting the part on the table you need to rotate the part and table together when you make your measurements, NOT the machine table.

Then later, if you need to center the table under the spindle, you rotate the spindle to measure and move the machine table, which has the rotary table and part bolted to it, to make the adjustment.

When using a rotary table on a mill, whether to mill an arc or drill holes in some circular pattern, there are two things that must be done to set up the workpiece. First, the workpiece must be centred on the rotary table. Second, the rotary table must be centred under the spindle. Then the mill table can be moved some appropriate distance and you can start cutting.

You could centre the table under the spindle first, by indicating off the hole in the centre of the table. Then you could mount the workpiece on the table and indicate off the workpiece. There are two problems with this approach. First, you are assuming that the hole in the table is true and centred. That may or may not be true. Second, this approach risks a sort of accumulation of errors, as you"re measuring from two different features (the rotary table"s hole and some feature on the workpiece). My suggestion is to centre the workpiece on the rotary table first, and then centre the rotary table under the spindle.

As shown in this photo, a DTI has been positioned with its tip against the inside of a hole in the workpiece. The DTI is held in the mill spindle, but that"s just for convenience. (When I do this, I put a little wooden wedge between the spindle pulley and the headstock, to make sure the indicator remains stationary.) It could as easily be held on a test stand. Indeed, the measurement doesn"t have to be done on the mill at all.

To centre the workpiece on the rotary table, spin the rotary table and watch for deflection of the indicator pointer. Adjust the chuck jaws as required, until the needle no longer deflects.

After the workpiece is centred on the rotary table, you now turn the spindle by hand, so the DTI tip sweeps the inside of the hole. Adjust the position of the mill table as required until no needle deflection is noted.

Again in this photo, a DTI is measuring from the inside of a hole. As in the previous illustration, the rotary table is spun and the workpiece"s position on the rotary table is adjusted until the DTI shows no deflection.

After the workpiece is centred on the rotary table, you now turn the spindle so the DTI tip sweeps the inside of the hole. Adjust the position of the mill table as required until no needle deflection is noted.

You can, of course, use the pointed end of a centre finder to position over a point on the workpiece. When centring the table under the spindle, if you are indicating off a larger hole or other curved feature, you may need to mount the indicator on a short arm, so you can sweep a large enough radius.

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then, to centre the workpiece itself, you first decide what accuracy level of centring you need.....just using a pointy mill wiggler in the spindle and aligning it with scribed lines on the workpiece can get you within .005 if you"re careful.

if you need to be closer, take a step back in history....."button up" the job with a toolmakers button......drill and tap for the button in the workpiece"s approx centre, snug up the button, adjust the button to the exact desired relationship with whatever surface or other feature of the workpiece defines your centre, and tighten up the button.

when your workpiece is placed on the rotary table, sweep the button with an indicator in the spindle, adjust position til your indicator zeroes out, and you"ll have it centred within the possible accuracy of the setup.

Mounts directly to a rotary table, Fixture Pro® Riser or any QLS Grid. Reduces distortion of parts like standard vises. Requires very little material (0.060” or less) to clamp. By cutting a 10º angle ...

Mounts directly to a rotary table, Fixture Pro® Riser or any QLS Grid. Reduces distortion of parts like standard vises. Requires very little material (0.060” ...

... gripping equipment. Detailed documentation is provided on request.These vises are exclusively intended for use as a static locking unit (mounting on CNC rotary tables, with rotating tools); ...

... gripping equipment. Detailed documentation is provided on request. These vises are exclusively intended for use as a static locking unit (mounting on CNC rotary tables, with rotating ...

High pressure ARNOLD TWIN vices are capable of clamping two pieces simultaneously.- Accuracy of 0.01 mm in clamping repeatability.- Suitable for working in horizontal and vertical machining centres.- Grinding of all ...

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Large Through-Hole Provides versatility in machining of more complex and/or long parts. Easier to install peripheral parts for multiple applications. Extremely Rigid Spindle Spindle is extremely rigid because of it"s constructed with three (3) roller bearings. Highly Accurate Brass Worm Wheel & Worm Shaft Zero-backlash is obtained using patented brass worm wheel and two-part worm shaft; made by German company "OTT". The backlash of wheel and shaft can adjust to a minimum of 0.003mm.

Strong Clamping Force Brake System Hydraulic pressure pushes the thin brake wall against the spindle. Brake Diaphragm Brake System NC Rotary Tables Provide: ☆ Durability & Longevity ☆ Compact Designs ☆ Strong Clamping Force ☆ Highly Responsive ☆ Low Mainte

NC Rotary Tables Enhance Your Machine Tools MC : Machining Center EDM : Electric Discharge Machine MDH P6 Horizontal Special-Purpose Machine Horizontal only Horizontal High-Speed Machine Vertical only Vertical only

Dielectric Fluid only Vertical or Horizontal EDM for Wirecutting & Small-Hole Drilling Deionized Water only Vertical or Horizontal Direct Drive Motor (1-axis) Direct Drive Motor (2-axis) Tail Stock Table Accessories Air-Hydraulic Booster Dimensions for T-Slot / Clamping Bolt

Vertical or Horizontal Position ・Highly Accurate, Rigid, & Durable ・Most suitable for vertical machining center 　→ Less interference between spindle and work-piece ・Zero-Backlash Worm Gear system ・Compact external form ・Large through-hole provides increased versatility Note1: ( ) = higher indexing accuracy model with rotary scale. In this case, the outside drawing will change slightly. (T.I.R) ■Specifications Item Note2: Option: Built-in rotary joint is possible. Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Gear Ratio Servo Motor (FANUC*)...

Vertical or Horizontal Position ・Most suitable for vertical machining center 　→ Less interference between spindle and work-piece ・Zero-Backlash Worm Gear system ・Compact external form ・Large through-hole provides increased versatility Note1: ( ) = higher indexing accuracy model with rotary scale. In this case, the outside drawing will change slightly. (T.I.R) ■Specifications Item Note2: Option: Built-in rotary joint is possible. Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Servo Motor (FANUC*) Gear Ratio Indexing Accuracy Clamping Torque...

Vertical Position ・Most suitable for horizontal machining center 　→ Less interference between spindle and work-piece ・Zero-Backlash Worm Gear system ・Compact external form ・Large through-hole provides increased versatility ※ Optional machines models MDU632RG and MDU802RG with greater rigidity for incredible power and precision. Note1: ( ) = higher indexing accuracy model with rotary scale. In this case, the outside drawing will change slightly. (T.I.R) ■Specifications Item Note2: Option: Built-in rotary joint is possible. Table Diameter Vertical Center Height Horizontal Center Height...

Horizontal Position ・Outstanding Flexible Manufacturing System (FMS) ・Best for production line, mass production of parts ・Most suitable for horizontal machining center ・Zero-Backlash Worm Gear system ・Compact external form ・Built-in rotary joint (4-12 ports) ■Specifications Item Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Gear Ratio Servo Motor (FANUC*) Indexing Accuracy Clamping Torque Clamping Pressure Permissible Machining Torque of Wheel Permissible Load Max. Machining Force at Clamping Permissible Work Inertia 12

MDVi TYPE Vertical Position ・Features high-precision OTT Worm Gear for greater power transmission ・Ideal for Scroll Machining or high speed applications ■Specifications Item Note1: Rotary scale is attached to『 i 』model. (T.I.R) Note2: Option: Built-in rotary joint is possible. Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Gear Ratio Servo Motor (FANUC*) Indexing Accuracy Clamping Torque Clamping Pressure Permissible Machining Torque of Wheel Permissible Load Max. Machining Force at Clamping Permissible Work Inertia 14 *Application for other...

MDAT TYPE NC Tilting Rotary Table ・Designed for 3D cutting, processing ・Most suitable for high-tolerance, five-axis machining ・High-precision OTT Worm Gear results in superior performance in rotary and tilt operations Note1: ( ) = higher indexing accuracy model with rotary scale. In this case, the outside drawing will change slightly. (T.I.R) Note2: Option: Built-in rotary joint is possible. Table Diameter Tilting Axis Center Height Table Height in Horizontal Through Hole Gear Ratio Tilting Axis Tilting Axis Tilting Axis Rotary Axis Tilting Axis Rotary Axis Tilting Axis Rotary Axis Tilting...

Precision Spinning Table Vertical or Horizontal Position ・High precision, high speed system ・Most suitable for grinding center and jig grinder ・Recommended for machining of ceramic and glass ・Able to attach special controller ■Specifications Item Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Gear Ratio Servo Motor Rotating Accuracy Indexing Function Clamping Torque Clamping Pressure Permissible Machining Torque of Wheel Permissible Load Max. Machining Force at Clamping Permissible Work Inertia

NC Rotary Table for Electric Discharge Machine EDM - Dielectric Fluid Vertical or Horizontal Position ・Most suitable for electric discharge machining of large-diameter plates ・Fully submersible in dielectric fluid ・Zero-Backlash Worm Gear system ■Specifications Item Note1: ( ) = higher indexing accuracy model with rotary scale. In this case, the outside drawing will change slightly. (T.I.R) Table Diameter Vertical Center Height Horizontal Center Height Through Hole Guide Block Width Gear Ratio Servo Motor (FANUC*) Indexing Accuracy Clamping Torque Clamping Pressure Permissible Machining...

Fig. 4—On this tilting rotary table, one servo controls rotation, another controls tilt. Both servocontrols are slaves to the CNC with RS-232 communication, providing five-axis capability from a standard three-axis CNC.

Fig. 1—Modern rotary tables such as this one from SMW Systems have large, widely spaced spindle bearings, large diameter wormwheels and built-in spindle brakes.

If you want to make parts similar to the complex valve body (upper left), an indexer using M-code, RS-232, or “full fourth axis” control is appropriate. Only positioning and rotary cutting moves are required. The center workpiece is a cam that requires simultaneous rotary and linear moves. You’ll need full four-axis control for such workpieces. If you want to do parts similar to the impeller on the right, the contour cutting will require simultaneous five-axis machining.

Many plant managers and shop owners dream of having the latest horizontal machining center (HMC) with all its features, benefits and sophisticated capability. While typical HMC features such as an automatic pallet changer and a 100+ cutting tool magazine are valuable, perhaps the most valuable characteristic is the HMC’s ability to machine on more than one side of the workpiece due to a built-in indexer or full fourth axis.

On complex workpieces that require machining on surfaces not 90 or 180 degrees from each other, indexing or fourth-axis rotation is almost essential to produce the piece. Even when rectangular workpieces with all surfaces 90 or 180 degrees from each other are put on a tombstone, the HMC’s built-in fourth axis of rotation creates a productivity advantage. This is true even if machining on more than one side of the part is not essential.

Any time you can increase the “run cycle,” do more cutting in one operation and avoid handling the workpiece, productivity goes up. Workpiece accuracy also improves. Unclamping and refixturing a workpiece to present a different surface to the cutting tool is always going to introduce some error.

The high cost of horizontal machining centers compared to the incredible values available today in vertical machining centers puts horizontals out of reach for many shops. Fortunately, today there are several suppliers of quality accessories that allow the VMC shop to equip its verticals with indexers, fourth axes and tombstones. These add-ons really work and give many of the benefits of an HMC at a fraction of the price.

Earlier rotary tables and indexers didn’t have the accuracy, rigidity or control flexibility of today’s models. Many shops that tried using indexers in the past had been disappointed in the performance of the older models and abandoned their use in favor of multiple operations, multiple holding fixtures and multiple handlings of the workpiece. They decided that the manual, multiple-operation process was better than trying to use ineffective early model indexers and rotary tables. Today, the situation is different. Manufacturers now offer units that are very accurate, very rigid and have a variety of control and interface options.

The best indexer and control system for you depend on the work you need to do. As with most things, different designs compromise certain capabilities to gain others. Unless you understand these trade-offs, you are at risk of selecting something other than the best system for your requirements. Let’s see what’s available, review the differing capabilities and discuss the advantages and disadvantages of each design. Once you understand the options, you can evaluate them against your requirements and then consider prices and suppliers.

Of course, such a system does not exist. Add the “lowest price from the supplier that gives the best service and support” component and it probably never will exist.

Terminology in the area of indexers is not standard. Terms such as fourth axis, indexer, rotary table and so on are used interchangeably by different machine tool and accessory companies. So, when selecting and buying, you must ask a few questions before assuming you know what you’re going to get. Also, beware of terms such as “precision,” “high precision,” “accurate,” and “rigid.” Is the “brake torque” specification some absolute break away spec or the torque at which some “unacceptable” amount of rotary deflection occurs? Is the “ten arc seconds” accuracy specification certified every one degree, or is it inspected only every 15 degrees? There are no industry standards for specifications and testing. So ask questions and deal with a supplier in which you have confidence, or buy with a guarantee of performance to make your parts.

We’ll start with the mechanical hardware and discuss the electronic control options later. There are at least three common mechanical indexer/rotary table types.

These tables provide infinite positioning as well as the possibility of rotary cutting. A servomotor controlled directly either by the CNC or by a secondary servocontrol rotates a wormscrew, which drives a wormwheel on the rotary table spindle.

The absolute position accuracy of these systems is a function of the quality (precision and accuracy) of the wormgear set (wormscrew and wormwheel), the accuracy and resolution of the servosystem, and the means of servoposition feedback. Most of these servosystems utilize an encoder to monitor the position of the motor rather than the rotary spindle directly. To eliminate any inaccuracies in the wormgears and servo system, some high-end systems use a glass scale or other encoder directly on the rotary spindle to monitor actual rotary spindle position. Figure 1 (at right) shows a typical wormgear rotary table cross section.

If controlled directly by the machine tool’s CNC, they are most commonly referred to as a “full fourth axis.” A full fourth axis has the advantages of having only one CNC program, no programming required by the operator on the shop floor, minimum chance of a crash due to operator error, and the ability to make simultaneous rotary and X, Y or Z moves to do true helical milling operations as required by some more exotic workpieces.

Claims of position accuracy are often misleading since there are no industry standards. Although some manufacturers test and certify absolute position accuracy every one degree, most do not state exactly what their specification means.For all except those few expensive systems with glass scales directly on the rotary spindle, any accuracy specification is for a new table before it has been subjected to any “crashes,” which are not uncommon. Even seemingly small crashes can damage wormgear sets.

Typical infinite positioning wormgear systems utilize a friction brake to hold position against cutting forces. When cutting forces are applied directly on the rotary spindle centerline, friction brakes are generally adequate for most work. However, when cutting forces are applied to workpieces far off centerline, such as on the edge of a part on a tombstone fixture, the resulting torque on the rotary spindle can cause it to deflect. This result is especially likely when heavy cuts produce high thrust forces.

These indexers offer discrete positioning only. Depending on the number of teeth on the face gear, the minimum increment of index might be 15 degrees, 5 degrees or 1 degree. Whatever the minimum increment, only workpieces with angles representing some multiple of the minimum can possibly be machined.

Face gear mechanisms used in indexers are similar to those most commonly found in the turrets of CNC lathes, which by function must index very accurately and very rigidly to withstand the high cutting forces the lathe turret encounters. Face gear mechanisms generally fall into two categories, the two-piece and the three-piece design. Two-piece designs require the face plate of the indexer to “lift” to disengage the face gears. Three-piece designs maintain the same accuracy and rigidity of a two-piece without the need to “lift” the faceplate. In Figure 2 (at right), note the massive face gear that locks the indexer spindle in position.

Assuming it’s a quality face gear set, absolute position accuracy is superb and is maintained for the life of the indexer almost in spite of any “crashes” that might occur. Units with true absolute angular position accuracy of 5 arc seconds or less are available. These units are ideal for the highest precision work such as line boring half way from one side, then indexing 180 degrees and line boring half way from the other side.

Some face gear systems use a servodrive to achieve approximate position and then rely on the face gear for final accurate positioning. These systems are bi-directional and fast. Any random move can be programmed with one simple command. Some other systems use a pneumatic piston to rotate to the approximate position. Typically, these systems rotate only in one direction. All moves must be equal and may require a pause to utilize more then one M-code signal to achieve position. These work but can be tedious to program, set up and operate. They are more prone to crash due to operator error then servodriven units.

These indexers are becoming a thing of the past. They have all the disadvantages of the pneumatic piston driven incremental face gear indexers. Plus, compared to face gear units, they are neither particularly accurate nor rigid. Index positions are usually limited to 15-degree increments. Position is controlled by a pin in a hole or more often by a dog in a notch on the outside of a ring.

Whether you select an infinite positioning wormgear rotary system or a facegear system as the best mechanical design for your work, your next decision involves how you will control the rotary axis.

With a pneumatic incremental indexer, you probably will have no choice. Your machine’s CNC will control the indexer by communicating with a special indexer control via an M-code.

If you select a system with a servodrive, you have three choices: 1.) direct “full fourth axis” using only the machine’s CNC, 2.) an M-code command from the CNC to a separate rotary control, or 3.) RS-232 communication between the machine’s CNC and a separate rotary control. Each of these choices has advantages and disadvantages.

A single, four-axis CNC is the easiest to use and provides the most control. Four-axis CNC is best for certain kinds of workpieces. Full four-axis control systems are usually ordered for delivery with a new machine. Systems can be retrofitted; however, retrofitting is complicated and expensive. The advantages of a single four-axis control are numerous, and the disadvantages are primarily related to cost.

The single CNC constantly tracks all three linear axes (X,Y,Z) and the rotary axis. This provides the ability to do precise helical cutting with simultaneous rotary and X, Y or Z moves.

While a few machine builders offer a full four-axis control with rotary table for about 10 percent of the base price of the machine, most charge more than 20 percent.

Very few machine builders make it easy to retrofit a full four-axis rotary table. For most builders, retrofitting is a complicated process, and the cost typically exceeds 30 percent of a base machine price.

The motor for the rotary axis must be matched to the servodrive of the CNC. Because cable connections are not standard from one machine builder to another, rotary tables can not generally be used on more than one machine.

Some applications may require the accuracy and rigidity of a face gear system. However, many machine builders don’t offer face gear systems with a full four-axis control, although such systems are feasible.

An M-code actuated system provides a fourth axis of motion by combining a standard three-axis CNC with a rotary table or face gear indexer that has its own separate rotary servocontrol. The rotary program is entered and stored in the separate rotary servocontrol. The CNC communicates with the rotary control via an M-code. When the rotary control receives the M-code signal, it executes the next rotary move stored in its memory, then sends a signal back to the CNC, telling it that the move has been completed.

Typically, the rotary program includes many separate rotary moves. One move might be a simple index to position at full rapid speed. Another might be a slower rotary move to machine a groove or other feature on the workpiece. Figure 3 (at right) shows a typical rotary servocontrol system.

High quality M-code controlled systems are available from several suppliers for a price of about 10 percent of a base machine price. (For example, a 5C rotary system at $6,000; a 6-inch faceplate system at $7,000; a 9-inch system at $10,000; and so on).

Requiring only one M-code, 110V power and an air line for operation, these systems can be retrofitted to almost any CNC machine, typically with less than a day of downtime.

Systems can be moved from one machine to another as long as the next machine can issue M-codes. A shop with multiple machines and multiple rotary systems can select the best system for each job regardless of the machine. For example, a small indexer can be used for small parts to avoid cutting tool interference problems and to minimize indexing times. A big indexer can be used for big parts. A face gear indexer can be used when the maximum in accuracy and rigidity are needed and the work can be accommodated by multiples of 5 degrees of index.

The machine operator needs to enter the rotary program into the rotary servocontrol, or select the right program if it’s already stored in the rotary control’s memory. This takes some time, and there is the chance of an error.

If the machining cycle is ever interrupted in mid-cycle, such as to inspect a workpiece feature or replace a worn cutting tool, the operator must be sure to back up the rotary program and the CNC program to a point that keeps the two programs in sync. This step can be confusing, and any error can result in a “crash,” with a cutting tool coming down to a workpiece rotated to the wrong position.

Although it is possible to perform simultaneous rotary and X, Y or Z moves, they are not recommended. If you have patience and can afford to scrap a few parts, you can use trial and error to find the right rotary speed to match the linear move and determine starting points that match.

Recently developed, RS-232 communication between a three-axis CNC and a rotary servocontrol offers advantages of full four-axis and M-code operation. RS-232 is the commonly used, standard electrical interface for connecting peripheral devices to a computer. Personal computers often use the RS-232 communication protocol to send information to a printer. Another common use for RS-232 communications is connecting a PC to an external modem.

Nearly all CNC units have an RS-232 port, and it is commonly used to exchange CNC programs between a computer system and the CNC. More recently, RS-232 connections have been used by CNCs to communicate with robots and rotary tables. To communicate with the rotary table’s control, a special line of code is inserted into the CNC program. This line of code sends a string of numbers and letters through the RS-232 port to the rotary table control, which translates the string of code into rotary moves.

RS-232 communication between a three-axis CNC and a rotary servocontrol provides much of the best of both worlds of full four-axis and M-code operation. Both the linear and rotary moves are stored in the CNC as part of the workpiece program. When a rotary move is required, the CNC sends the commands for that one move (rotary speed and angle of rotation) through an RS-232 line to the rotary control.

The rotary control executes that one move and sends back a signal to the CNC, indicating that this move has been completed. The CNC then commands its next linear move. The separate rotary servocontrol simply works as a slave to the CNC. The machine operator turns the rotary control on in the morning and does not need to attend to it the rest of the day. Figure 4 (at right) shows a tilting rotary table system utilizing two rotary servocontrols with RS-232, providing five-axis capability from a standard three-axis CNC.

Crashes are nearly as unlikely as with a full four-axis control. The correct rotary program is always selected because it is part of the total workpiece program stored in the machine’s CNC. Note: Rotary moves should be programmed in “absolute position” so that if the machining cycle is interrupted, the operator can back up the CNC program to just in front of a rotary move, then safely resume the program.

Retrofitting is easy provided the machine’s CNC has an RS-232 port and appropriate communication software, which may already reside in the CNC or be available from the machine builder.

With RS-232, two rotary controls can be operated by most three-axis CNCs with only one RS-232 port. Five-axis capability with a tilting rotary table setup can be retrofitted to a three-axis machine for about $25,000 (a new, full five-axis VMC option is typically priced at $95,000).

Both the work you need to do and the machines you own or intend to purchase will influence what you select for a rotary axis. These guidelines summarize what you should consider.

When buying a new machine, get prices on everything the builder offers, no matter what kind of workpieces you’ll be machining. If the builder offers a full four-axis system with a high-quality, infinite-positioning rotary table at a price of about 10 percent off the base machine, this system will probably be your best choice.

If your workpieces can take advantage of the accuracy and rigidity of a face-gear system, and you can live with the 5-degree minimum increment, a face gear system controlled by RS-232 or M-code is a good choice. A few builders offer a face gear system with true four-axis control.

If you’re doing a variety of work that requires simultaneous rotary and linear helical moves, you’ll probably want a true four-axis system regardless of the cost. However, you should consider a more economically priced RS-232 or M-code system when you are retrofitting an existing machine and have only a couple of jobs requiring these moves, especially if these jobs are long run and you can afford some extra programming and setup time. These systems are worth considering if you simply can’t afford the price of a true fourth axis.

If you’re retrofitting existing machines, especially if you have several and want to do rotary work on more then one of them, check with the builder on the cost of upgrading to full four axis. You may conclude that the cost and flexibility advantages of RS-232 or M-code will make one of them the best choice.

Adding a rotary axis to a VMC is worthwhile whether you want to do full four-axis simultaneous machining of exotic workpieces, simple indexing of parts that need machining on surfaces not at 90 degrees from each other, or tombstone processing of rectangular parts that benefit from a longer unmanned machining cycle. Today, many good options exist. If you’re buying a new machine, have the builder quote the optional systems it offers. If you’re going to retrofit an existing machine, contact either the original supplier or the companies that offer complete indexer and rotary table systems. Retrofitting is highly affordable. (Systems from SMW Systems, for example, generally cost a little over $1,000 per inch of faceplate diameter, including installation and training.) MMS

Mitee-Bite Products’ fixtures demonstrated their powerful clamping support in a project with Akron Gear & Engineering to vertically hold a 1-ton ring during machining.

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* pL SOLUTIONS Shanghai Co. Ltd is part of a network of locally owned, independent representatives and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS India/SEAis part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS Italia is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS Japan is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS USAis part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS India/SEA is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS USA is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS India/SEAis part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS South Korea is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS India/SEA is part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS USAis part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

* pL SOLUTIONS India/SEAis part of a network of locally owned, independent distributors and service specialists dedicated exclusively to the sales, service, and support of CNC rotary tables designed and manufactured by the Swiss firm Peter Lehmann AG (pL)

VEVOR is a leading brand that specializes in equipment and tools. Along with thousands of motivated employees, VEVOR is dedicated to providing our customers with tough equipment & tools at incredibly low prices. Today, VEVOR has occupied markets of more than 200 countries with 10 million plus global members.

VEVOR is a leading brand that specializes in equipment and tools. Along with thousands of motivated employees, VEVOR is dedicated to providing our customers with tough equipment & tools at incredibly low prices. Today, VEVOR has occupied markets of more than 200 countries with 10 million plus global members.

The vertical & horizontal rotary table, one of the main accessories of the milling machine, is a precision work positioning device. This machine is widely used in metalworking, enabling the operator to drill or cut work at exact intervals around a fixed axis.

It can be mounted "flat," with the table rotating around a vertical axis, in the same plane as the cutter of a vertical milling machine. Or, mounted the rotary table on its end (or mount it "flat" on a 90° angle plate) so that it rotates about a horizontal axis. In this configuration, a tail stock can also be used, thus holding the workpiece "between centers."

HT200 casting has excellent casting performance, shock absorption performance as well as high strength heat resistance. It ensures the superior performance of the machine and provides you a good sense of use.

The dial is divided into 360 degrees in total. The minimum scale can be accurate to seconds. All of these help you handle more complex and more precise tasks. Spindle end is applied accuracy bearing. Can be assured to keep very steady under load cutting

It"s not difficult for you to adjust the rotary table milling machine. What you should do is to adjust the handle to the position where you want because the precise scale is marked on the dial.

Except for the 5.9""(150 mm) rotary machine table, we also offer you four locating blocks. The center can be corrected quickly and accurately by the Key guide block.

G234 Tool Center Point Control (TCPC) lets a machine correctly run a contouring 4- or 5-axis program when the workpiece is not located in the exact location specified by the CAM-generated program. This eliminates the need to repost a program from the CAM system when the programmed and the actual workpiece locations are different.

G234 Tool Center Point Control (TCPC) is a software feature in the Haas CNC control that allows a machine to correctly run a contouring 4- or 5-axis program when the workpiece is not located in the exact location specified by a CAM-generated program.

This eliminates the need to repost a program from the CAM system when the programmed and the actual workpiece locations are different. The Haas CNC control combines the known centers of rotation for the rotary axes (MRZP) and the location of the workpiece (e.g., active work offset G54) into a coordinate system.

TCPC makes sure that this coordinate system remains fixed relative to the table; when the rotary axes rotate, the linear coordinate system rotates with them. Like any other work setup, the workpiece must have a work offset applied to it. This tells the Haas CNC control where the workpiece is located on the machine table.

TCPC is activated with G234. G234cancels the previous H-code. An H-code must therefore be placed on the same block as G234. G234is canceled by G49, G42, and G44.

TCPC G-code is programmed from the tool tip. The control knows the centers of rotation for the rotary axes (MRZP), the location of the workpiece (active work offset), and the tool length offset. The control uses this data to calculate the position of tool tip relative to the active work offset and maintains a static tool tip position through rotary feed moves.

G234 Tool Center Point Control (TCPC) is a software feature in the Haas CNC control that allows a machine to correctly run a contouring 4- or 5-axis program when the workpiece is not located in the exact location specified by a CAM-generated program. This eliminates the need to repost a program from the CAM system when the programmed and the actual workpiece locations are different.

The Haas CNC control combines the known centers of rotation for the rotary table (MRZP) and the location of the workpiece (e.g., active work offset G54) into a coordinate system. TCPC makes sure that this coordinate system remains fixed relative to the table; when the rotary axes rotate, the linear coordinate system rotates with them. Like any other work setup, the workpiece must have a work offset applied to it. This tells the Haas CNC control where the workpiece is located on the machine table.

For clarity, the illustrations in this section do not depict workholding. Also, as conceptual, representative drawings, they are not to scale and may not depict the exact axis motion described in the text.

The straight line edge highlighted in is defined by point (X0, Y0, Z0) and point (X0, Y-1., Z0). Movement along the Y Axis is all that is required for the machine to create this edge. The location of the workpiece is defined by work offset G54.Location of Workpiece Defined by G54

TCPC is invoked in . The Haas CNC control knows the centers of rotation for the rotary table (MRZP), and the location of the workpiece (active work offset G54). This data is used to produce the desired machine motion from the original CAM-generated program. The machine follows an interpolated X-Y-Z path to create this edge, even though the program simply commands a single-axis move along the Y Axis.G234 (TCPC) On and the B and C Axes Rotated

Invoking G234 (TCPC) rotates the work envelope. If the position is close to the travel limits, the rotation can put the current work position outside of travel limits and cause an over travel alarm. To solve this, command the machine to the center of the work offset (or near the center of the table on a UMC), and then invoke G234 (TCPC).

CNC rotary table is a device used to assist the workpiece in multi angle machining on the machining center. One-time clamping and multi-faceted machining can ensure the position accuracy between workpiece features and improve the use efficiency of the machine tool. In contrast, the standard machining center has only three axes x, y and Z. after adding four axes, it can process workpieces with complex features, such as blades, cams, etc.

In practical application, it is necessary to match with some additional accessories to meet the requirements, such as disc tail stock, chuck, zero point system,  controller mode, braking device, etc

If the work piece is made of aluminum, copper materials, and the machining cutting force is small, you can choose harmonic gear, DD motor type rotary table, or choose worm or roller cam structure, and use pneumatic brake.

If the parts are made of cast iron, steel and other materials, it is recommended to select the rotary table with worm or roller cam structure, and judge whether to add hydraulic brake according to the cutting force.

2. If it is odd and abnormal, and more than 2 workpieces are processed at one time, please purchase additional disc tailstock. In addition, L-shaped block, large base plate and medium plate can be made according to actual needs

(1). Worm, roller cam and DD motor rotary tables have different accuracy and retention life.which should be determined according to the workpiece accuracy

(2).If accuracy specified in mm, check for the diameter at which the accuracy is required.Convert Indexing Accuracy of the Rotary Table specified in arcsec to mm at the diameter where the operation is to be carried out,(A = Tan Ө x R),Ө = Indexing Accuracy (Ex: +/- 15” (30”sec)),R = Radius at which the operation to be carried out ,A = Accuracy in μ

(2) Confirm the total load that the machine tool can bear, and then add up the weight of the preselected rotary table, tail stock, L-Block, medium plate (bridge plate), base plate, work piece, fixture and so on,

(3) If it is overweight, judge the material of the workpiece first. If it is aluminum alloy or other light materials,which caused by the long shape support joint or large rotation diameter of the work piece, you can change the indexing disc to a smaller model and add a cushion block to reduce the weight, so that the price is low and can meet the requirements of the rotation diameter of the work piece.

After moving the Y-axis of the machine tool to the origin, measure the distance from the center of the worktable to the metal plate of the moving door of the machine tool, check the size from the center of the disk surface of the indexing plate to the tail end of the motor cover, and judge whether the motor cover will interfere with the metal plate of the machine tool. If there is interference, change the motor cover

First confirm the length of the machine tool workbench, especially when the scheme of disc tail stock and bridge plate is selected, the bottom plate is 200mm larger than the machine tool workbench at most, that is, 100mm will protrude on both sides, which is the maximum allowable protruding position

The rotary table is generally composed of several parts as shown in the figure below: ① rotary table house, ② motor of the fourth axis, ③ cable with sheath, ④ cable without sheath, and ⑤ driver. In addition to the five major hardware, the interface must be reserved for the fourth axis on the machine tool.

(2).If the machine tool does not have interfaces reserved for the fourth axis, but wants to add the fourth axis later, please ask the machine tool manufacturer to open the interface or select the single axis controller, but the single axis control system cannot be linked with any axis of the X, Y and Z axes of the machine tool. Only after the rotation of the fourth axis is completed, the other three axes can operate.

when purchasing rotary table and disc tail stock, and designing the cradle type fixture, when eccentric machining is caused by the force arm (A) exceeding the disc surface (the higher the cushion is, the longer the force arm A is, which is not the load of mechanical common sense), it will seriously wear the rotary table reducer. Please be careful