3.5 Clamping of the workpiece 3.5 Clamping of the workpiece In order to secure the workpiece in the located position whilst under the action of the cutting force, inertial force and gravity force, a clamping device must be incorporated into jigs and fixtures. As the machining quality and production efficiency are directly related to the clamping device design and selection, therefore, the following requirements must be ensured in clamping device design, namely: accurate ,rapid, secure and solid