Quote:
Originally Posted by marki
Yes Peter I have the 12mm set to suit the lathe. I am not happy with the thread form in the fine pitch's so am going to grind my own. I am finding cobalt tool steel cuts a lot cleaner then the carbide tips as the speeds are too low.
Cheers
Mark
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In my experience it depends how deep you cut each pass so I now take 4 or 5 passes to cut these threads trying the fit between each pass as I've also found there is a huge variety in t-threads between different manufacturers. I always run the final cut twice at the same depth setting. I finish off with some very fine wet and dry over the top of the thread to round off the ridges as the cutting tool won't do this.
I'm running the lathe at min RPM (70 I think) when cutting threads.