ACTUATION METHODS

Craftsman can design an Expanding Mandrel system to suit your exact production requirements. Listed below is a selection of the common actuation methods for energising the mandrel. These can be combined with most mounting and holding methods to produce a complete mandrel to your specification.
Drawbar actuated : This method allows automatic, in-cycle clamping of the part. This is particularly useful when combined with robotic loading and un-loading. Operation is by the drawbar through the spindle to a rotating cylinder and the back of the machine. This allows accurate control of the clamping force and is useful for thin and delicate components.
Thread actuated : This manually operated method is suitable where drawbar actuation is not available. The sleeve is energised using a threaded nut on the front of the mandrel. This method is not usually suitable for mountings with tailstock support, but can be arranged in certain circumstances.
Cantilever Nut actuated : This style is used where drawbar actuation is not available and front access to the mandrel is not possible, due to for instance mounting into a blind hole in the component. A large nut situated behind the sleeve provides actuation and a component back stop is usually included for accurate positioning.
Opposed Tapers : This method is particularly suitable for gripping a variety of components with a wide length range. Variation in component length (and diameter) is accommodated by a series of sleeves and appropriate spacers. Each individual sleeve sits between the same tapers for actuation, allowing quicker changeovers between parts and sizes.
Other actuation methods can be customised to your exact needs. Craftsman Tools Ltd have over 50 years experience and can design a solution for almost any problem.