HYDROK – Safety
Spread of the
clamping force
Chuck size
SPANNTOP
Radial clamping
reserve in
diameter [mm]
Clamping force
spread factor S
3
Clamping force
spread factor S
»verified«
4
32
1,0
2,8
5
1,3
42
1,0
2,0
5
1,3
52
1,0
2,0
5
1,3
65
1,0
1,6
5
1,3
80
1,0
1,6
5
1,3
100
1,5
1,45
1,3
125
2,5
1,45
1,3
140
1,5
1,45
1,3
160
1,5
1,45
1,3
Table 2: Spread of the clamping force
Forms of contact
Snug fit
Saddle seat
Edge seat
Fig. 3: Forms of contact between smooth top jaws and workpiece
Contact case
Snug fit
The clamping diameter of the clamping head is equal
to the clamping diameter on the workpiece.
Saddle seat
The clamping diameter of the clamping head is
greater than the clamping diameter on the workpiece.
Edge seat
The clamping diameter of the clamping head is less
than the clamping diameter on the workpiece.
3 These values are based on a regularly maintained and lubricated operating status as specified in the
operating manual.
4 If the radial clamping force is measured before each commissioning, and continuously every 100
clamping set-ups, with a measuring device that is suitable for this purpose, then work can be per-
formed with the reduced clamping force spread factor shown.
5 If due to more dimensionally accurate workpieces the radial clamping reserve of the chuck [see Ta-
ble 2] is only utilized up to a limit of 50%, the clamping force spread factor can be reduced by a fac-
tor of 0.85 [example:
Order h49 7144.907-333
25
Jaw
Workpiece
