Inspired by Rivett608’s thread about making small screws (see Why does steel split like this? Very small parts.), I had to see if I could cut such a tiny thread – M0.7 x 0.175 – on my HLV-H
The closest I could get to 0.175mm pitch, without buying another gear, was 0.1778mm.
I had to dig out my wonderful Russian Lomo microscope to check the cutting tool edges (where do you get super fine abrasives for this type of sharpening?) and I broke several part threads before realising I have to make a close-up steady rest.
Not really up to Rivett’s standards, but this is my first attempt with the steady (see attached)
(it looks like I cut it a little too deep )