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Model G0768/G0769 (Mfd. Since 8/15)
Loosen one gib adjustment screw (see Figure
145) and tighten the opposing screw the same
amount to move the gib, while at the same time
using the handwheel to move the headstock until
you feel a slight drag in the path of movement.
Adjusting Z-Axis Way Gib
Figure 145. Location of top Z-axis way gib.
Z-Axis Way Gib
(1 of 2)
The rigidity of the half nut engagement is adjusted
by tightening or loosening the half nut gib screws.
Adjust the half nut if it feels too loose or too tight
when being engaged. Movement that is too stiff
will accelerate wear. Movement that is too slop-
py will produce inaccurate turning or threading
results.
Tools Needed Qty
Open-End Wrench 7mm .................................... 1
Hex Wrench 3mm .............................................. 1
To adjust half nut:
1. DISCONNECT MACHINE FROM POWER!
2. Disengage half nut.
3. Loosen thread dial cap screw, tilt dial out of
way, then secure to access gib screws and
nuts (see Figure 146).
Adjusting Half Nut
4. Loosen gib nuts and adjust screws in small,
even increments so one end of the gib does
not become tighter than the other.
5. Engage/disengage half nut several times and
notice how it feels. The adjustment is cor-
rect when half nut firmly and easily engages
leadscrew while opening and closing.
6. Repeat Steps 4–5, if necessary, until satis-
fied with feel of half nut engagement.
7. Re-install thread dial so teeth mesh with
leadscrew, then tighten cap screw.
Figure 146. Half nut gib adjustment set screws.
Cap Screw
Gib
Screws &
Nuts