Hi All

Has anyone come up with, or seen, a novel way to make an automatic lathe
chuck?

These devices, hydraulic or pneumatic, are eye wateringly expensive. Getting
something in and out of the chuck is one of the main sticking points in a
small scale automation lathe.

While one could often get away with two fixed jaws and the third activated,
it still requires a lot of fiddling between jobs.

Collet draw-in chucks are too limited in their scope.

Possibly the easiest way is to have a motor with reduction drive mounted on
the carrige at centre height, and perpendicular to the Z.  The drive shaft
is ended with a square. The chuck would rotate into position, and the drive
shaft motioned into place and the chuck opened and closed much as one would
do manually.
This way, you could;
- tighten each jaw if you wanted to
- control the clamping force
- open/close the chuck over it's full range without having to adjust jaws
between jobs
- still allow manual operation

Any ideas?

Regards
Roland

PS, the load/unload robot is a seperate issue;)
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