american block rotary table made in china

American Block offers a complete line of drilling rotary tables that range from 17 ½ to 60 ½ . These tables are designed to withstand the harshest drilling conditions. All rotary tables feature a fabricated frame, heavy duty main thrust bearing and precision machined spiral bevel gear that results in superior strength, toughness and durability.

American Block can also provide unitized rotary table assemblies (IRD). Our unitized skid packages are ideal for new builds or can be retrofitted to existing rigs. Featuring a heavy-duty oilfield skid and an extend life transmission. The rugged design ensures that when the equipment is mounted it remains rigid during operation and rig moves. Other rotary table options include hydraulically operated tables and high torque tables (25% more torque), which are ideally suited for top drive operation.

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Rotary table in market mainly includes 4 kinds of mechanism that is worm gear, roller cam, DD driver and harmonic structure. The following is the introduction:

1. worm gear: it’s one of  the most popular structrue in NC rotary table  because of its irreversibility and costs.The worm is generally made of bronze, but the wear resistance is poor. In order to improve the service life, some manufacturers use the alloy steel.

3.DD motor: it’s the most efficient rotary table with the highest precision. It has the highest precision because it has no mechanical structure, which is directly driven by motor , no reducer. It has high technical difficulty and high price. It is generally used for five axis machine tools.

Heavy duty servo rotary table HRTJ280 series could be freely programmed for any angle indexing, with large central opening reach to 135mm, it is quite convenient for engineers to wiring and piping in automation rotary motion and provide more options for engineers.

Sango HRTJ280 heavy duty servo rotary table is making better performance than HRT280, more output torque but keep same positioning accuracy, bigger designed loading than HRT280.

An anti-overturning stabilization ring is arranged in the center hole of the turntable of HRTJ280, which can greatly enhance the overturning moment and solve the load-bearing problems such as side mounting and hoisting. The load can be directly fixed on the hollow rotating platform for transmission, and it is suitable for servo motors and stepping motors of various brands.

We"re well-known as one of the leading hollow rotary tables manufacturers and suppliers in China for 10 years. Our factory offers high quality hollow rotary tables made in China with competitive price. Welcome to contact us for wholesale service. Semi Closed Linear Modules, Harmonic Drive Gears, Screw Driven Linear Modules

1. In the horizontal position, the left (top in the vertical position) hold-down notch has a rounded and painted surface on the top. This means the clamp bolt"s washer doesn"t sit parallel to the table. This means it has a tendency to slide around as it is tightened. I will probably mill it flat, shortly.

3. There is a fair amount of backlash in the worm gear, but I haven"t even looked for an adjustment yet. There are 2 clamps on the side of the table and these can be locked in place to deal with the backlash.

6. There are 2 clamps, 4 bolts, and 4 t-slot nuts supplied. On a 6" table, it doesn"t take a big part to run out of clamping room. I have already made a simple ring to bolt down a part that I was making.

7. In the vertical position, the base is too wide to allow both slots to be used to clamp it down to the table. This is a concern for me. I found this out today and used a couple of 123 blocks to wedge it in position. There isn"t much room to use a clamp block as the clamps that are on the rotary table swing down very close to the mill"s table as it is rotated.

9. Remember to lock the mill"s table in place or you can get some very puzzling movement due to backlash in the mill"s table. It isn"t much but it can be a headscratcher!

Quantronix has been able to reduce cycle times by using a Fadal 6030 VMC with a TR 165 fourth/fifth axis tilting rotary table to machine the frames and housings for its lasers.

Five-axis machining tends to conjure up images of pricey VMCs machining aerospace components with complex curves and undercuts. However, manufacturers and commercial job shops are finding a VMC and tilting rotary table with fourth- and fifth-axis motion can significantly reduce setup, handling and cycle times on a variety of commercial components and parts. These rotary tables can deliver higher accuracy and provide more rigidity for heavy cutting routine operations, such as facing, pocketing, drilling holes and tapping.

The basic concept is to machine parts with only one setup per part. The operator loads the part just once, pushes the cycle start button, and the rotary table moves the part in the required position. This is repeated until all sides/surfaces of the part have been machined and the cycle is finished. Or, the operator can load several parts onto the rotary table and start the machining. As one part is finished, the rotary table brings the next one into the proper position, machining begins, and so on. The advantage is that the VMC can be left unattended for longer periods of time, and less time is spent handling the part.

Whether machining one part at a time, or loading several parts on the same rotary table, the most tangible benefit is the time savings. For example, the machinists at Quantronix load a 6- by 6- by 4-inch aluminum block onto the rotary table and machine the main pocket on the part, which becomes the optical housing. Four different surfaces can be machined with only one setup—the aluminum block is held in place on two sides, so the remaining four sides can be machined—then, machined using the fifth axis starts. The part has angled compound holes with milled surfaces. Drilling these angled holes on the fifth axis eliminates four separate handlings and leads to machining individual housings in 17 minutes, instead of 1 hour. Tool changes are reduced because all of the operations for a tool are completed before the next tool is loaded.

It is important to recognize that each time a part is moved, it is impossible to position it exactly the same as before, which will affect the specified tolerances. But by handling the part once and letting the rotary table rotate the part into position, the part will be positioned within the tolerance capability of the rotary table.

The optical housings must be parallel within 0.001 inch. This parallelism is achieved with the rotary table, and housings are manufactured with tolerances of 0.0005 inch or better. Accuracy and repeatability on the rotary table are ensured with hardened and precision ground faceplates, pre-loaded bearings and CNC ground-worm shafts.

An important factor in this situation is how the rotary table and VMC work together. Knowing the rotational speed of the table and its torque is essential. The rotary table should also be able to keep up with the tolerances of the VMC. The control needs to accept the rotary table without rewiring. Many of today’s controls can be ordered prewired for rotary tables. For example, the Fadal 88HS Fanuc-compatible control on Quantronix’s 6030 can be ordered so that it can connect to four- and five-axis rotary tables for indexing and true simultaneous machining operations.

Having reduced part cycle times by more than two-thirds, Quantronix reports a revenue increase. “We’ve had phenomenal results with our 6030 and the rotary table,” says Steve Worner, Quantronix’s job shop manager. “Our Fadal 6030 has helped us grow our business beyond what we had expected, and our productivity has shot up.”

The stage includes an optical rotary encoder with a digital TTL output signal. After 400x interpolation, the resolution of one encoder count = 0.07 arc-sec (0.33 µrad). Very fine encoder resolution is necessary to enable smooth velocity control by the servo system.

Of utmost importance to this application was the very low error motion of the air bearing. Measurements were taken using a master ball and a capacitance probe. The master ball was mounted 50mm above the air bearing tabletop. Total radial runout error motion measured was less than +/-25 nanometers.