5.1 MAINTENANCE
Read the following sections to understand how to maintain the 4th
Axis:
l
l
"Adjust the Lock Nut" (on the next page)
l
"Adjust the Rotary Table" (on the next page)
l
"Examine the 4th Axis for Coolant Resistance" (page 11)
l
"Examine the Locking Lugs" (page 11)
l
"Examine the Motor Coupling" (page 12)
l
"Lubricate the Rotary Table" (page 13)
5.1.1 Adjust the Backlash
NOTICE!
You must complete the steps in this procedure to
adjust the backlash. If you do not adjust the backlash, it could
result in premature wear on the rotary table.
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 5-1: Backlash adjustment screw on a standard
rotary table.
Figure 5-2: Backlash adjustment screw on a tilting rotary
table.
Figure 5-3: 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.
Page 9
©Tormach® 2019
Specifications subject to change without notice.
tormach.com
TD10552: Owner's Guide: 4th Axis (0919A)
TECHNICAL DOCUMENT
