Between Centres Mandrel
The nut operated between-centres expanding mandrel is generally mounted between 60 degree centres, and can be driven from the drive flat with a carrier or drive plate. It is possible to attach a simple component end locator, if required, at diameter L.
There is a ground diameter G to adapt this mandrel to face-plate mounted, if required, by use of an adaptor plate. Adaptor plates made to suit the machine mounting can be manufactured by PTG Workholding Ltd., or the customer. Component end locators, solid-type or compensating (for out-of-square locating faces) can also be supplied, or manufactured by the customer.
These mandrels are generally used for small-batch grinding operations. These mandrels are hand-operated by use of conventional spanners, and are often used for inspection purposes.
For maximum efficiency, expansion sleeves should be pre-loaded to maintain contact with mandrel double-angles at all times.
