Mandrels and Drives
HEAD AND TAIL STOCK DRIVES
This type of drive is usually used if the mandrel is too long or heavy to mount on a cantilevered drive. A centre axle support fits inside the shaft that is secured at both ends. A motor, attached at the head stock, provides the power that turns the mandrel on the drive while the head and tail stocks support the mandrel. To unload the mandrel, the operator simply supports it with a bridge crane or cart and then pulls the tail stock away from the mandrel. It is then possible to pull the mandrel off the drive and either hoist it with a crane or take it away on a cart. To remove a part, such as a tank, after collapsing the mandrel: the operator pushes the tail stock back from the mandrel and then slides the axle support out from the tail stock end. It is then possible to push the tank off the mandrel.
Supports for mandrels that range in diameter from 2 inches (5.1 cm) to 16.4 feet (5 metre).
With this drive, mandrels are mounted to a long support tube. In operation, a chain feeds around a sprocket on the mandrel to turn it. A simple pull of a lever collapses the mandrel so the part can be easily pulled off. Then, to unload the mandrel from the drive, you simply loosen the chain connected to the sprocket, and remove a nut fastened to the mandrel’s centre bearing. It is then possible to slide the mandrel off the drive and load another.
SOLID AND COLLAPSIBLE MANDRELS
Standard mandrels are designed to your particular specifications and many include any diameter or length that can be shipped legally from our factory. For mandrels 600mm (24″) and above, the mandrels have a quick release pneumatically powered collapsing shell with special peeling action that makes separation of the part quick and easy. A single break line with close fitting machine cut allows parting film to bridge the crack without the usual additional prepping of the mould. This allows a part that appears to be made on machined and ground moulds. The mandrels are constructed by assembling water jet cut ribs on the centre shaft. The final OD of the ribs are then machined ground to the required OD. After this, the sheet metal skin is applied and painted. An additional option of a flat bottom or dome shaped end can be added to the cantilevered mandrel end. This mandrel bottom/top will collapse around the knuckle and would be provided with pneumatic blow out holes for ease of part extraction/removal.