Planmeca ProMax 3D Max with ProTouch Technical Manual page 185

Technical manual
The lift screw mechanism includes a friction pad, as well as a spring inside
the adjustment screw shaft to control the friction.
Adjust the lifting screw friction pad mechanism with care to avoid over-
tightening.
1. Tighten the adjustment screw by hand (1 in the figure above) until the
spring inside is fully depressed.
The spring depresses to its full extent and the adjustment screw cannot
be easily tightened by hand.
CAUTION
Do not tighten using an Allen key or other tools, as over-tightening will
cause damage to the friction pad or the screw threads.
2. Release the adjustment screw by a few turns, until the screw turns more
freely but there is still some tension on the screw.
3. Tighten the locking nut by hand (2 in the figure above) against the
mechanism base to hold the adjustment screw's position.
6 Patient support arm
Planmeca ProMax 3D Max 179