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schunk.com XND.00005.022_A – 10/2018 34
6 Troubleshooting, eliminating faults
Vice is hard to operate
Dismantle, clean and the damaged surfaces must be carefully levelled off with a honing
stone.
Setting ring does not move
Variation 1: setting ring has been turned in too
far
Gap A is approx. 0 mm. To release the setting ring,
turn it anti-clockwise.
Variation 2: setting ring has been turned out
too far
Gap A is approx. 2 mm. To release the setting ring,
turn it clockwise.
Insufficient clamping force
Remove the spindle assembly.
Clean the guides of base plate and spindle nut.
Insert the spindle assembly.
Re-attempt clamping.
If necessary, contact your Schunk representative in view of replacing the mechanical force
cassette or spindle assembly.
Important: do not disassemble the mechanical force cassette and spindle
assembly as this will void your guarantee.
The clamping force setting changes of its own accord
If this happens during clamping or releasing, there is increased friction of the seal in the
knurled knob. The cause is that the sealing ring under the setting ring has swollen due to the
effect of the cooling liquid, soiling or similar.
Remove the spindle assembly.
Hold the spindle assembly with the knurled knob in
a vertical position.
Lubricate the area between the setting ring and the
bearing bush with thin lubricating oil.
Turn the setting ring back and forth several times. If
necessary, contact your Schunk representative in
view of replacing the spindle assembly.
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