Hi Rich
I firstly did not want to confuse one topic with another, which I think I did, my apologies for that.
I did a little testing of my own, after reading countless threads, on this this subject, and I do understand your meaning of running the spindle independent of mah. My problem is I want my cake and eat it too, I want to have it the run fully from the PC.
OK I started again from scratch and setup everything as you have written in the lathe threading DOC. I must say I have read through it in past but for some reason my mach setup was less then advisable. After altering quite a few different config settings I noticed a huge improvement in the way the lathe behaves while it tries to cut thread. I cut a thread using the wizard M12x1.5 using 16 passes in a mild steel rod, 400rpm and a 0 as the lead in, I’m surprised the thread actually turned out as good as it did , pic shows thread compared to the same size tap.
One other thing that I tried on another scrap piece was turning a thread at different speeds, I turned a thread at 300rpm then left it in the chuck and returned it at 200 rpm then 400rpm, what I noticed all three turned the thread properly but the start point was not in the same position on each of them, the slower turn started the thread earlier on the same piece and the faster later, no doubts the thread was ruined but interesting test non the less.
I will have a go at SS to see if it makes any improvements or not, if not its not a waste as I can simply use it on a Bridgeport mill I’m currently converting.
Thanks muchly
Katoh