
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. It is recommended by ABB for M6-M20 screw joints. 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.
Generally, screws are lubricated with
Gleitmo 603
mixed with
Geomet 500
or
Geomet 702
in proportion 1:3.
Geomet
thickness varies according to screw
dimensions, refer to the following.
Geomet thickness
Lubricant
Dimension
3-5 μm
Gleitmo 603
+
Geomet 500
M6-M20 (any length except
M20x60)
3-5 μm
Gleitmo 603
+
Geomet 720
M6-M20 (any length except
M20x60)
8-12 μm
Gleitmo 603
+
Geomet 500
M20x60
6-10 μm
Gleitmo 603
+
Geomet 720
M20x60
Tightening torque
Before tightening any screw, note the following:
•
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%
!
Product manual - CRB 15000
1085
3HAC077389-001 Revision: L
© Copyright 2021 - 2023 ABB. All rights reserved.
9 Reference information
9.4 Screw joints
Содержание CRB 15000
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