4: INSTALLATION
To Set the Backlash by Positioning the Backlash
Adjustment Screw
1. Identify the backlash adjustment screw: Remove the
protective cover screw on top of it, or loosen a jam nut.
Figure 4-107: Backlash adjustment screw on a
standard rotary table.
Figure 4-108: Backlash adjustment screw on a tilting
rotary table.
Figure 4-109: Backlash adjustment screw on a super
spacer rotary table.
2. Loosen the backlash adjustment screw six turns
counterclockwise.
3. Disengage the eccentric lock and clamp handles.
4. Engage the worm gear: Rotate it completely
(counterclockwise on standard and tilting rotary tables;
clockwise on super spacer rotary tables).
5. Verify that the rotary table does not turn. It doesn't turn
when the motor is engaged.
6. Use one hand to put counterclockwise pressure on the
motor (clockwise on super spacer rotary tables), and
slowly tighten the set screw until you feel resistance to
the pressure you're applying.
Tip! Move slowly — the resistance could be
subtle.
The set screw is just against the worm drive.
7. Tighten the set screw a quarter-turn. The motor rotates
slightly, and creates a gap (for an oil film) between table
and worm gear.
8. Replace the protective cover screw.
To Set the Backlash by the Numbers
Adjust for a minimum backlash of 30 arc-seconds.
Measured at the outer circumference of an 8-in.
diameter circle with a dial indicator, 30 arc-seconds will
be 0.0006 in. of lost motion.
Setting the backlash to 60 arc-seconds will sustain a thicker oil
film, yielding lower friction and longer life. Measured at the
outer circumference of an 8-in. diameter circle with a dial
indicator, 60 arc-seconds is 0.0012 in. of lost motion.
We do not recommend setting the backlash greater than 90
arc-seconds (1.5 arc-minutes). It won't improve the life of the
mechanism, and could result in chatter during machine
operations.
Mount the Rotary Table
1. Prevent rust from forming on the machine table from
trapped water-based coolants: put a thin film of oil (WD-
40® or similar) on the surfaces.
2. Depending on your rotary table, do one of the following:
l
Standard Rotary Table (6 in. or 8 in.) Put the
rotary table on the left side of the machine table.
l
Super Spacer or Tilting Rotary Table (6 in. or 8
in.) Put the rotary table on the right side of the
machine table.
©Tormach® 2023
Specifications subject to change without notice.
Page 81 Tormach 1100M® Operator's Manual (Version 1223A)
For the most recent version, see tormach.com/support
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