walter rotary table made in china

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!

Bobs rolling table is, of course, the answer to horsing around a hefty rotary table or dividing head. (Somewhere in internet space there is a design for an elevating multiple shelf version which can successively bring any shelf to the top so that the heavy vice, rotab, dividing head or whatever on that shelf can be slid onto the mill. Gotta be the complete answer. Muggins here lost the bookmark and, so far hasn"t able to come up with a neat replication.)

In practical terms an 8" is generally too small for 12" to the foot work, especially once space lost to clamps is taken into account. Clamp losses are always vastly disproportionate to diameter for smaller tables. A 10" table has around half as much again useful; area as an 8" one whilst a 12" has nearly double. A 10" horizontal vertical is about the largest generally practical size to use vertically on a Bridgeport and tends not to be silly heavy. Its what I have and am well pleased with so possibly I"m biased.

Cost of course is an issue, especially if buying new or having shipped from a distant used dealer. An intermediate sub table is a good way of winning extra space. The 8" Vertex I have about the place will accommodate nearly 14" diameter and still permit the dial to be read, albeit with a bit of peering round the edge. Possibly a use for an old car or small truck flywheel. If the piggy bank will stand the strain the 1/2" solid aluminium breadboards sold by Thor Labs (Thorlabs, Inc. - Your Source for Fiber Optics, Laser Diodes, Optical Instrumentation and Polarization Measurement & Control) and not unaffordable. UK catalogue price for a 12" x 12" which will sit nicely on an 8" rotab is around £110, I imagine the $ price is pro rata. These are decently flat, although not perfect the 6 thou per square foot error quoted is very conservative in my experience, and have a grid of 1/4 UN tapped holes at 1" intervals which are a great help when mounting things and a great curse when de-swarfing! The anodised coating is tough too and well up to shop use.

Reversible clamp, 4th axis, rotary table, rotary dividing table, controlled rotary table, dividing attachment, dividing head, rotary indexing table rotary coupling

Univ. swivel-tilt- turntable similar to lid, Maho milling machine tablemounting table for Univ. Tool milling machineTable size 680 x 340 mmSlot width 14 mmSlot spacing 45 mm Rotatable 360° (1 turn on handwheel = 4° on table)Nonius 240 graduation lines in minutesTiltable /- 30° (drive via square with threaded spindle)Pivoting 30° (drive via square with threaded spindle)- 7x T-slot 14 mmm- Mounting plate 320 x 220 mmDimension L x W x H 780 x 470 x 320 mmWeight approx. 180 kgguter

Welding rotary tables increase work flexibility, productivity and quality. Rotary tables also support the welder at work and thus guarantee a safe working environment and better working ergonomics.

The main advantage of PEMA rotary tables is that the workpieces can always be set in the best possible welding position. This can increase welding productivity by up to 70 %.

Reversible clamp, 4th axis, rotary table, rotary dividing table, controlled rotary table, dividing attachment, dividing head, rotary indexing table rotary coupling

This article focuses on rotary surface grinding. The aim is to give the user the necessary information to set the correct grinding parameters. All parameters are directly compared to standard surface grinding to understand this process better. Apart from the rotary movement of the table, rotary surface grinding is the same a standard surface grinding. The rotary movements are converted into linear movements to support this argument of sameness. This conversion allows for a better understanding of the rotary process.

For both processes, rotary and standard surface grinding, the wheel surface speed ranges between 25 and 45 m/s, with 35 m/s being a good starting point.

The theoretical average chip thickness is a function of the depth of cut ae and the speed ratio qs. The target value of the chip thickness hm should be around 0.25 µm, with an upper limit of around 0.5 µm. At values higher than 0.5 µm, conventional grinding wheels tend to break down. The above statement is, of course, equally valid for reciprocating and rotary surface grinding.

When calculating the overlap ratio for rotary grinding, one looks at the relationship of the feedrate vw per one table revolution, as shown in Illustration 15:

Assuming the grinding wheel width bs is 25 mm, the feedrate vw is 70 mm/min, and the table rotation is 17 RPM, the overlap ud would be a factor of 6 as shown in the spreadsheet of Illustration 16:

To generate a spreadsheet from the instructions given in this article is relatively simple. The speed ratio is not constant as the table RPM of the rotary grinders known to the author have constant feedrates and constant table RPM. Hence, one must assume a "middle" or average diameter, as shown in Illustration 16. In general, the grinding would not take place in the center of the rotary table anyway. As the wheel position moves towards the center of the rotating table, the surface speed of the table decreases. However, it would be easy to make a CNC program that takes the decreasing surface speed into account and compensates by proportionally increasing the table RPM as shown in Illustration 17:

Assuming a table diameter variation from 500 mm to 100 mm, the RPM ranges from 17 to 84 RPM is one were to compensate and achieve a constant speed ratio of 72 as in this example.

Going back to reciprocating surface grinding, the calculation of the parameters is similar. However, as the table moves linearly, all the parameters are constant. Again, making a spreadsheet is not complicated.

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.

Indexing table 380 mm diameterDiameter graduation directly in 15 degree steps24 he graduation via index boltdirectly with crank and index plate7 Clamping fluteswidth 12 mmGes. height 120 mmWeight 55 kg

Compact precision small rotary table, suitable for single part or small series production in laser welding precision mechanics. A horizontal or vertical assembly is possible.

It is particularly suitable as a 4th axis on engraving and milling machines for engraving, lasering, drilling, grooving, slot milling, or for use on a tool or surface grinding machine.