Special collets, three-part expanding collet

We manufacture three-part expanding collets according to Nann designs or customer drawings. These expanding collets are used if the customer already has a fixture for drawback collets and wants to internally clamp a workpiece on this machine.

This type of expanding collet consists of a body which has the same dimensions as the suitable drawback collet. On the shaft side the part with the external thread is cut off and extended with an intermediate section, so that the required mandrel can be screwed in from the front. For installation of the complete mandrel the free bore of the collet is ground, and the mandrel is secured against distortion. The body is extended forwards, and the front part is adapted to the workpiece that needs clamping and is then slit.

To activate the expanding collet, pull on the thread section; the mandrel opens the expanding collet attached to the fixed body and thus clamps the workpiece. Expanding collets of this type are available in all kinds of different variants.

Please don’t hesitate to contact us. We will be glad to provide tailormade clamping devices for your requirements.