The Xpandrel method of expanding mandrels was introduced in the mid-1990s.
2.
Original expanding mandrels have a slightly tapered wedge that will expand to hold the item.
3.
Dr Church had invented an expanding mandrel for fixing boiler tubes, and it was the first tank engine to have a multitube boiler.
4.
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 ).
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