GRESSEL AG Centros Instructions De Service page 29

Power grip jaw for increased clamping force
Work-piece support
By turning the support jaws 3, a span of 3 or 5 mm can be achieved.
Ideally, the clamping stroke should be kept as low as possible.
(Ideal relationship between clamping force and spring force)
The high clamping force results in a Z- and X-adjustment by
bending the basic jaw. Clamping using constant tightening
torque (torque wrench) ensures repeat accuracy.
Simple clamping
The clamping jaw 4 stroke ranges from 0 to 4 mm, to allow
clamping without using the spindle 8 on the centros
Centric clamp
The following sequence is important!
1. Clamping jaw 4 must be pushed back completely.
2. Clamp using spindle 8, with min. torque 40 Nm.
3. Clamp using the increased clamping force on differential screw 5,
max. 60 Nm.
The basic jaws are already resting on the work piece in the above
procedure. When the force is increased using the clamping lever,
the left and right jaws bend correspondingly. Using this clamping
sequence, you can achieve a central positional accuracy of
+/- 0.2 mm.
Loosening:
1. Loosen the increased clamping force completely.
2. Loosen the basic spindle of the centros
Warning: Centric clamping with the power grip jaw
If you do not prestress using the basic spindle centros
a one-sided bridging of clearances occurs, which results in
a centre adjustment.
Maintenance/Lubrication
Lubricate the threads and pressure surface below the clamping
screw 5 at least once a week.
To lubricate the lower pressure surface, clamping screw 5 can be
loosened.
Cleaning/Breakdown:
Clamping jaw 4 does not spring back:
Blow out the swarf under the clamping lever 6
Unscrew the front spring plate 7, turn clamping lever 6
downwards, clean, and remove swarf.
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