(57) A compression tool comprises a tool head (12) and a pair of dies (24, 26) mounted
in the tool head for compressingly, surroundingly engaging a generally tubular workpiece.
The dies (24, 26) define a minimum opening and a maximum opening therebetween for
accommodating workpieces over a corresponding range of sizes. A fluid operated drive
(30) urges the dies (24, 26) inwardly to compress the workpiece and a fluid pressure
control (42) is provided for controllably varying the maximum pressure of the fluid
supplied to the fluid operated drive (30) in accordance with the size of a workpiece
to be compressed.
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