expanding mandrel

The Xpandrel method of expanding mandrels was introduced in the mid 1990s.

Also available with a 'slider and link' precision expanding mandrel suitable for applications not requiring such a large expansion range.

Original expanding mandrels are slightly tapered with a tapered wedge that will expand to hold the item.

Dr Church had invented an expanding mandrel for fixing boiler tubes, and it was the first tank engine to have a multitube boiler.

In addition to the outside-holding collets, there are collets used for holding a part on its inside surface so that it can be machined on the outside surface (similar to an expanding mandrel).