Nor-Cal PMXYZ Series Precsion Manipulator - Manual (Page 6)

High-Vacuum Containment and Control
Lubrication
All exterior bearings, micrometers, lead screws and guide rods are lubricated
with GHT-2 high temperature lubricant. The user will need to add more lubricant
from time to time, depending on the frequency and temperature of bakeouts and
operating environment.
**************WARNING************
Additional lubricant must be added to the lead screw (or Z axis micrometer
threads) as the use and environment requires. The standard lifting mechanism is
a bronze acme thread on a burnished steel acme lead screw. This is a sliding
contact, requiring lubrication. Equipment overloading, heavy use, high
temperature bakeouts, environmental conditions, etc. can and will remove the
lubricant from this interface. THIS WILL CAUSE PREMATURE WEAR. If this is
continued to an extreme, the nut will fail and allow the stage to suddenly drop.
THIS SITUATION IS DANGEROUS TO EQUIPMENT AND PERSONNEL AND
MUST BE AVOIDED. Inspect this mechanism and relubricate as needed. The
Acme screw/nut mechanism should have 0.002" to 0.006" vertical (axial)
backlash maximum. If more is detected, consult the factory for suitable repair.
************** WARNING *************
This lubricant has been tested to 230 C. We recommend limiting the
temperature of the lubricant to 200 C or less.
Avoid inhalation of decomposition products formed above 300C.
This material may give off toxic gasses at elevated temperatures.
Bakeout procedure
We recommend limiting the temperature of the lubricant and the bakeout
temperature to 200 C or less.
See safety warnings under "Lubrication".
Do not run uncontrolled bakeouts or bakeouts approaching 300C