Keith, I just came across the thread so here is my input. I had the same problem a few years ago and ended up converting my 10x22 lathe to a ELS (Electronic lead screw)for short money by purchasing a kit. It worked great but got me spoiled and ended up converting it to full CNC. I then installed the ELS on a HF 7x10 mini lathe which is my go-to lathe for small AG parts. I like the Z axis fine control, of the ELS, for turning and threading.
Hi Keith, Are you sure the error would be cumulative? The distance between the threads should stay the same, regardless of the length of the thread. HTH
James is spot on , otherwise , youd have variable pitch on a manual machine which until now has only been accompllished on cnc
You could always turn 10 revolutions and check with calipers, 50 turns would be better but now you are sacrificing a lot of stock.Just a scratch pass should be enough to measure and see what the result is going to be.
Quote from: Rob M on June 05, 2021, 04:33:58 PMJames is spot on , otherwise , youd have variable pitch on a manual machine which until now has only been accompllished on cncI still am having trouble understanding.1.5mm = .0590625 inchWith Transposing Gears for 1.5mm = .060576 inch10 x .0590625 = .59062510 x .060576 = .60576.60576 - .590625 = .015135 difference from start