Bruce Barnett wrote:

Hollowing - for the most part, starting from the middle out.
So one disk will nest inside a second disk.

I would suggest making a mandrel. Have some piece of round mild steel,
make a round recess on it's front where the disk fits into and glue it
in with LockTite. After the work, heat it up to about 150°C and the glue
will release.
Of course, you can use a magnetic chuck (with most steels) or a vacuum
chuck.


Nick
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