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Screw cutting

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colin hamilton25/09/2021 19:28:02
43 forum posts
19 photos

Thanks everyone, I was getting confused between 60 and 30 degrees. I reset the angle to 60.5 and followed Chris suggestion for a no calculation method and it worked fantastically.

I was so enthused I've moved onto making a new arbour for my table saw so I've started on a 5/8 11tpi witworth for my second screw attempt. What could go wrong!!

colin hamilton25/09/2021 22:15:20
43 forum posts
19 photos

Great advice, I had mixed up my 30 & 60 degrees. I followed Chris's no calculation method (above) and it worked out fantastically. I really like the fact that I dont need to remember where I got to, just keep cutting until the top slide gets back to zero. I think it's going to be my 'standard's method.

It went so well I've decided to make a new arbour for my table saw. Next thread is a 5/8 11tpi left handed thread; what could possibly go wrong!!

John Reese27/09/2021 22:51:23
986 forum posts

The older lathes made in the US and I assume also in Europe had 0 deg. on the compound when the compound was perpendicular to the spindle axis. It seems that Chicom lathes read 0 when the compound was parallel with the spindle axis. That caused a lot of problems for beginners who read the old how to books and tried to follow those instructions on a Chicom lathe.

On fine threads plunge feed with the cross slide works fine. On coarser threads flank feed with the compound usually works best. An easy way to remember how to set the compound angle is that it should be parallel with the trailing flank of the tool. Actually it should be adjusted 1/2 to 1 degree closer to perpendicular. That assures the trailing flank od the tool takes a slight cut.

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