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0.750x40 tpi thread.

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mick70	08/01/2017 11:46:50
524 forum posts 38 photos	in MEW there is project for screw modification tool that is threaded 0.750x40. i know in article it says use what you have but my taps go up m16 then start again at m24 or english equivalent. couldn't see that size on tracey tools when i looked. prob me not looking right. what size is it?
Russell Eberhardt	08/01/2017 12:04:49
2785 forum posts 87 photos	Tracy tools catalogue 2010 ( my latest) lists 3/4 in x 40 tpi under Brass, Cycle, and special. Russell.
Ady1	08/01/2017 12:08:34
6137 forum posts 893 photos	If you count it up then 0.75mm x 40 =30mm Since there are 25.4mm in an inch then it's deffo not TPI So it's a 40mm bar, threaded 0.75mm In metric parlance, M40 x 0.75mm Quite a rare beast, if I've read you correctly Edited By Ady1 on 08/01/2017 12:14:39
mick70	08/01/2017 12:15:14
524 forum posts 38 photos	sorry missed the " off 0.750.
Ady1	08/01/2017 12:19:33
6137 forum posts 893 photos	Aha!, I did wonder. A fraction also makes discerning metric/imperial a bit easier 3/4" x 40TPI kinda thing
HOWARDT	08/01/2017 12:30:19
1081 forum posts 39 photos	If you read the article, John says he would make the thread 32 or 26tpi if he was making it again or 1mm pitch for metric. So M18 X 1 or use whatever you have, or cut on the lathe.
Ian S C	09/01/2017 09:01:20
7468 forum posts 230 photos	Quite an easy size to handle in the lathe. Ian S C

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