Rotary Table Information
The Tormach Motorized Rotary Tables are designed and built for machining operations that involve large forces, cutting fluids, and frequent operation. These are the same tables used to create the PCNC 1100 4th axis option. The tables are popular with machine builders, manufacturing engineers, and OEMs.
Rotary Table Design
The tables utilizes a direct drive principle instead of a belt drive. This approach avoids the problems of side loading on the worm screw bearing. Motorized tables include a Tormach MTM series (Machine Tool Motor), specially designed for operation in a metal cutting environment. It is totally sealed against cutting fluids, chips, and dust. The motor mount has a sealing O-ring at the face. In horizontal operation the oversized coolant channels direct the coolant to your table channels. In vertical operation the table offers flat surfaces for rigid clamping both in front and behind.
The backside clamping surface is a feature that some rotary table designs do not offer. T bolts, nuts, and low profile clamp bars are all included. There is no need for unwieldy step blocks; the low profile clamps allow for extra work piece clearance.
Rotary Table Features
- Horizontal and vertical operation
- Removable 5/8” locating key
- Adjustable worm gear for backlash correction
- Pre-wired AMP CPC power connector (motorized only)
- High performance, direct drive motor (motorized only)
- Dual anti-rotation locks
- Quick release of worm gear for free rotation
|
Specifications
|
30194
|
30267
|
| Table Diameter |
200 mm
|
160 mm
|
| Taper of Center Hole |
3MT
|
2MT
|
| Width of T-slot |
12 mm
|
10 mm
|
| Adjacent Angle of T-slot |
90°
|
90°
|
| Width of Locating Key |
5/8"
|
5/8"
|
| Worm Ratio |
90:1
|
90:1
|
| Graduation / Vernier |
1° / 10"
|
1° / 10"
|
| Angle per Full Step |
0.02°
|
0.02°
|
| Motor Steps |
200/rev
|
200/rev
|
| Motor Winding |
2 phase
|
2 phase
|
| Motor Inductance |
3.5 mH
|
5.73 mH
|
| Motor Resistance |
0.42 Ω
|
1.34Ω
|
| Motor Phase Current |
5.5 A
|
2.8 A
|
| Motor Holding Torque |
4.6 Nm
|
1.9 Nm
|
| Motor Mount |
NEMA 34
|
NEMA 23
|
| Motor Shaft |
1/2"
|
1/4"
|
| Cable |
10' high flex
|
10' high flex
|
| Shipping Weight |
89 lbs
|
70 lbs
|
Application Note on the Rotary Table
Customers have asked us to supply tables with standard NEMA motor mounts so they can use their own motors. While we are happy to supply these, there is a caveat on motor speed. We do not set a specific speed limit, but integrators should be aware that higher speeds increase wear. In our own applications we limit motor speed to a very conservative 450 RPM, 5 RPM table speed. A 5000 RPM servo motor without speed limits could probably kill a rotary table in short order.
Rotary Table FAQ
The single most frequent question we receive is "How can they be so cheap?" This question is normally in the context of a comparison with models offered by Haas, Yuasa, or others where similar size tables start at $5000 to $7000. Our tables are an outstanding value where they suit the application, but they are not suitable for all applications. The Tormach rotary tables have differences which can be important in certain situations. The more significant differences are noted here.
- Haas and other manufacturers
quote 15 arc seconds backlash.
Our tables will have 30 arc
seconds of backlash. On an 8"
table 30 seconds of angle amounts
to 0.0006" at the outer edge
of the table.
- Any table should be locked
in place during heavy milling.
Conventional CNC tables have
integral pneumatic table locks,
designed to be automatically
actuated. Tormach has manually
operated levers for the table
locks.
- Tormach tables use hydrodynamic
bearings. There are no ball
or roller bearings internal
to the table.
- Tormach rotary tables move 1800 degrees per minute (5 RPM). Most servo driven tables move much faster.