Screw Joints - ABB CRB 15000 Product Manual

9.4 Screw joints

General
This section describes how to tighten the various types of screw joints on ABB
robots.
The instructions and torque values are valid for screw joints comprised of metallic
materials and do not apply to soft or brittle materials.
Gleitmo treated screws
Gleitmo is a special surface treatment to reduce the friction when tightening the
screw joint. Screws treated with Gleitmo may be reused 3-4 times before the coating
disappears. After this the screw must be discarded and replaced with a new one.
When handling screws treated with Gleitmo, protective gloves of nitrile rubber
type should be used.
Tightening torque
Before tightening any screw, note the following:
Product manual - CRB 15000
3HAC077389-001 Revision: A
• Special torques are specified in the repair, maintenance or installation
procedure descriptions. Any special torque specified overrides a standard
torque!
• Use the correct tightening torque for each type of screw joint.
• Only use correctly calibrated torque keys.
• Always tighten the joint by hand, and never use pneumatic tools.
• Use the correct tightening technique, that is do not jerk. Tighten the screw
in a slow, flowing motion.
• Maximum allowed total deviation from the specified value is 10%!
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9 Reference information
9.4 Screw joints
623