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Short QC Biltz type tapping chuck

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PekkaNF:
All starts with a wrong type spring that has right wire size, but is bit too small: OD25 mm, ID21 mm over a 28 mm OD pipe. Whole set into 290C oven for an hour.

After taking it off OD grew to 29,5 mm and ID 25,4 mm. Interesting.

Little deburring and parts start to look ready to assemble.

PekkaNF:
Turned a simple bushing to keep the spring from doing springy stuff and to locate the sliding /locking outer bushing in check. Simple job made out of acetal (POM) and then it was time pres the locking bushing into MT arbor.

It works better than I expected, spring forces are good and ejection of the QC-holder is positive but not with terminal velocity.

Nice excercise and learned bit more about the springs.

Pekka

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