Glossary of clamping technology

1. Actuating torque

Torque with which the clamping device is actuated, e.g. with a torque wrench.

2. Base end-stop

Workpiece end-stop within the chuck.

3. Centrifugal force

Occurs at rotation, with a jaw chuck for example. The jaws are forced outward and the clamping force decreases. TOPlus and SPANNTOP on the other hand enclose the clamping  head with their chuck body and therefore are virtually loss-free.

 4. Clamped position

Defined position of the clamping element, in which the nominal diameter is clamped, if the workpiece does not have any tolerance deviation.

5. Clamping force, radial [frad]

Force with which the workpiece is radially clamped by the clamping device.

6. Clamping head protrusion length

Front nose extension of the clamping head that projects beyond the face of the chuck.

7. Clamping of finished material

Workpiece that is clamped on a finish-machined surface.

8. Clamping of raw material

Workpiece that is clamped on an unmachined surface.

9. Clamping range

Indicates the total range of the clamping diameters that can be covered with the respective size of the clamping device. Multiple clamping elements are required to use the entire range.

10. Clamping reserve in Ø

Additional clamping distance of the clamping device for spanning negative workpiece tolerances.

11. Concentric precision

Deviation [difference between the greatest and lowest dial gauge indication] of a test piece at rotation relative to the reference axis.

12. Draw force / compression force axial [fax]

Force, with which the clamping device is actuated, e.g. by a clamping cylinder.

13. Drawtube position

Dimensions of the front edge of the drawtube inside / outside of the machine spindle to the bolt-on surface of the clamping device on the spindle.

14. Holding power

The force with which the workpiece is clamped in the clamping device.

15. RD

Round geometry, e.g. clamping head outer geometry SPANNTOP.

16. Release stroke in Ø

Distance of the clamping element from the theoretical clamping position to the release position, in which the workpiece can be removed or the clamping element can be changed.

17. Repeatability

Deviation that can be measured as the spread of two successive assembly and disassembly processes. It cannot be corrected manually, it is intrinsic.

18. Rigidity

Resistance of the clamping device against plastic deformation due to force or a moment.

19. SE

Hexagonal geography e.g. clamping head outer geometry TOPlus.

20. Span / recommended workpiece tolerance

Clamping range, in which the workpiece tolerance should be.

21. Spindle nose

Standardized interface between clamping device and machine spindle.

22. Torsional safety

Positioning of the clamping element in the clamping device.

23. Vulcanization

Procedure for producing high-quality rubber-steel combinations. It is used with our clamping heads, for example.