scope:

Introduction

Technical progress in the development of machine tools and tools keeps enhancing cutting performances. The clamping device, which connects the machine tool with the workpiece, has to meet everincreasing requirements concerning the achievable accuracies and clamping forces. Especially in jaw chucks on turning machines, centrifugal and machining forces affect the effective clamping forces, which means that the clamping forces applied to the workpiece change with the spindle speed and the machining parameters. For reasons of safety at the workplace, knowing the effective clamping forces is particularly important, especially where spindle speeds are high. This means that the minimum clamping force required for the machining task will often limit the maximum permissible speed of the clamping device, and hence the head spindle.

The permissible speed is mainly determined by the required clamping force which the chuck must transmit to the workpiece to take up the forces and torques acting during cutting, and to ensure slipfree locking of the workpiece.

This guideline on the determination of permissible speeds applies to hand- and power-operated jaw chucks for turning.