Facing and Boring with 4-Jaw Chuck

[DIYSwede]

Thanks for sharing - excellent drawings in the pdf as well.
Clever and fast use of a disk spring, avoiding dovetail cutting entirely for this makeshift boring head.

Coincidentally I'm into another upcoming metrology project where I'll need a zero backlash differential screw as well
(same solution as in this post: Repeat Reading Gage - DIYSwede's "Cheap-O-Meter"):
Special RH thread M6 x 0,75 mm and standard RH thread M4 x 0,70 mm, will give a LH screw with a 0,05 mm pitch...

Proof-of-concept "acrylic vise":


ATB
Johan