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
Just read through the section on cutting the recess in the back of the holder at 13 mm, and the explanation is just plain wrong. It is based on a failure to understand the precision that can be reached on these simple machines, a lack of appreciation of the actual clearances in standard screw threads and the clamping action when tightening the thread. All the experienced engineers I work with understand these things, and have no problem grasping how the 12 mm register achieves concentricity.
