emco rotary table free sample

This post shows what I did to add a stepper motor indexed drive to an EMCO 150mm Rotary table, and how I added a "Grip-True" style adjustment to the attachable 125mm 3-Jaw and 5C chucks.

I decided to follow MichaelG"s route of using a rotary table as the gear blank active axis, and began modifying my rotary table. The main reason for the test bed requirement is that it is very difficult to test the software in simulation as far as accelerations are concerned.

This is an issue when doing continuous hobbing, as the blank has to spin up synchronised to the hob, when starting and stopping the hob spindle. If the inertial mass and friction exceeds the steppers capability, steps are lost and sync as well, with gear teeth misaligned. Some electronic hobbers have very little blank holder inertial mass to spin, while using a rotary table is probably the most mass you could apply..

The Worm stub external to the table is short and of not a very practical shape to attach the stepper - I decide to go for belt drive as even with a NEMA23 stepper, if the stepper shaft were aligned with the worm drive, the stepper body would protrude about 16mm below the underside of the table"s base.

That makes it difficult when placing the table on the bench, mill table, etc - spacers are needed and so on. I made an adaptor for the pulley, which includes a shaft preload to remove worm shaft end-play.

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The Sinumerik ONE is the universal and flexible CNC system. With a wide range of functionality, it is suitable for use in almost all technologies. The Sinumerik ONE sets standards in terms of dynamics, precision and integrability in networks.

EMCONNECT is included in the standard machine. Switching between emcoNNECT apps and the control system is possible with a single click. All production-relevant data can be displayed in full-screen or sidebar view.

Whether prototype construction, maintenance or, most importantly, training - EMCO"s conventional and cycle-controlled machines manage the balancing act and offer maximum accuracy in the smallest possible space and flexibility down to the last detail. Highlights of the EMCOMAT 17D- Main spindle DIN55029- Tailstock (eccentrically adjustable)- Simple steel holder (clamping claw)- Belt drive for feed gear- Chuck protection with electrical limit switch- Optional equipment such as coolant device, slid...

A rotary table is a precision work positioning device used in metalworking. It enables the operator to drill or cut work at exact intervals around a fixed (usually horizontal or vertical) axis. Some rotary tables allow the use of index plates for indexing operations, and some can also be fitted with dividing plates that enable regular work positioning at divisions for which indexing plates are not available. A rotary fixture used in this fashion is more appropriately called a dividing head (indexing head).

The table shown is a manually operated type. Powered tables under the control of CNC machines are now available, and provide a fourth axis to CNC milling machines. Rotary tables are made with a solid base, which has provision for clamping onto another table or fixture. The actual table is a precision-machined disc to which the work piece is clamped (T slots are generally provided for this purpose). This disc can rotate freely, for indexing, or under the control of a worm (handwheel), with the worm wheel portion being made part of the actual table. High precision tables are driven by backlash compensating duplex worms.

The ratio between worm and table is generally 40:1, 72:1 or 90:1 but may be any ratio that can be easily divided exactly into 360°. This is for ease of use when indexing plates are available. A graduated dial and, often, a vernier scale enable the operator to position the table, and thus the work affixed to it with great accuracy.

Rotary tables are most commonly mounted "flat", with the table rotating around a vertical axis, in the same plane as the cutter of a vertical milling machine. An alternate setup is to mount 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 tailstock can also be used, thus holding the workpiece "between centers."

With the table mounted on a secondary table, the workpiece is accurately centered on the rotary table"s axis, which in turn is centered on the cutting tool"s axis. All three axes are thus coaxial. From this point, the secondary table can be offset in either the X or Y direction to set the cutter the desired distance from the workpiece"s center. This allows concentric machining operations on the workpiece. Placing the workpiece eccentrically a set distance from the center permits more complex curves to be cut. As with other setups on a vertical mill, the milling operation can be either drilling a series of concentric, and possibly equidistant holes, or face or end milling either circular or semicircular shapes and contours.

with the addition of a compound table on top of the rotary table, the user can move the center of rotation to anywhere on the part being cut. This enables an arc to be cut at any place on the part.

Additionally, if converted to stepper motor operation, with a CNC milling machine and a tailstock, a rotary table allows many parts to be made on a mill that otherwise would require a lathe.

Rotary tables have many applications, including being used in the manufacture and inspection process of important elements in aerospace, automation and scientific industries. The use of rotary tables stretches as far as the film and animation industry, being used to obtain accuracy and precision in filming and photography.

To me, this table is just the right size and weight, not so small as to be a mere toy, but not too large, heavy, and expensive for my simple needs. I have had it for three weeks now and decided to review it after completing my first project.

When I first examined it I noticed that is seemed very well made and operated very smoothly. It definitely exceeded my expectations. I noticed it had a backlash of 20 minutes of arc, which I considered this totally acceptable. Accurate work is always done by turning knobs in one direction only. This table has a convenient knob to hold the position when it is reached. You can set the angle to about 1 minute of arc, and hold it there.

For my first project I made a couple of simple fixtures. One was a centering hold down, the other was an aluminum sub base. This is especially useful for mounting the table vertically in my drill press cross vise.