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ChrisH	22/12/2014 11:19:39
1023 forum posts 30 photos	Recently have successfully done a large metric thread - 45mm OD x 3.5mm thread, both external and internal - following the instructional video's from Tom's Techniques. He advocates setting the top slide over to 30 degrees, not any other number, taking the vast majority out of the thread using the top slide and for maybe the last 10 thou (maybe more, forgotten already!) taking it with the cross slide so the tool, ground as a form tool, will form the final thread shape. All I can say is that it worked very well for me and no problems setting the cross slide to 30 deg any more than it would have been for 29 deg, easier in fact! But I do understand exactly what Marc L'ecuyer is saying. Will now watch more of his videos Sorry, this post seems to have gone 'off thread' - no pun intended! Chris
Vic	22/12/2014 11:32:34
3453 forum posts 23 photos	Thanks for that link Ian, I've seen it explained on paper but that was pretty good. Only problem is the scale on my machine is printed and got largely wiped off in cleaning. I'll have to make a 29° Angle plate!

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