On Sat, Aug 13, 2022 at 10:30 PM, g steinback wrote:
Many years ago Doug Collinge produced a nice tutorial on machining a collet holder -
/g/Unimat/files/ER-16%20Collets/Unimat%20ER-16%20Collet%20Holder.pdf
All very well, but he makes the recess in the back 13 mm diameter, thus losing a major location. I always aim for 11.99/12.00 mm, achieved with a slightly worn machine reamer and verified with a bit of 12.0 mm (actually 11.99 mm) silver steel (drill rod) and aluminium foil. I made various holders from brass, and the first time they were screwed on they were stiff, and left a witness mark of brass on the 12.00 spindle nose. This was before final machining of the holders or whatever I was making.
I have yet to set up for the equivalent for the U3 - so far I have not made any special tooling for it.
