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colchester bantam threadcutting

Need to cut 13tpi

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Martin Peck	29/11/2014 22:37:43
20 forum posts	I need to cut a 13tpi thread (1/2 in UNC). This size does not appear on the chart, but 26tpi does. My thoughts are as follows:- On the other charts A on the 3 position lever is slowest, B is twice as fast as A and C is twice as fast as B. The setup for 26tpi uses A1, so if I use B1 wil I get 13tpi? Anyone know the answer?
John Stevenson	29/11/2014 23:39:46
5068 forum posts 3 photos	To cover all bases and be far quicker than wading though conflicting advise would be to do a scratch cut on a lump of bar and measure it with a pitch gauge
Martin Peck	30/11/2014 09:59:44
20 forum posts	Thanks John, I tried it this morning and it works perfectly!

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