stuart Posted January 13, 2021 Report Share Posted January 13, 2021 21 minutes ago, RogerH said: there is also 26tpi in ME (like the 20tpi) but is not standard. Roger I thought 26TPI was more for Cycle thread. Stuart. Quote Link to post Share on other sites
RogerH Posted January 13, 2021 Report Share Posted January 13, 2021 There are only two standard ME thread TPI - 32 & 40 and have the Whitworth thread angle of 55' Cycle threads are set at 26tpi and have an angle of 60' So if you have the odd situation where you need 26tpi but with 55' angle then up pops a 'special' Why didn't they just stick to BA Roger Quote Link to post Share on other sites
RobH Posted January 13, 2021 Report Share Posted January 13, 2021 4 minutes ago, RogerH said: So if you have the odd situation where you need 26tpi but with 55' angle then up pops a 'special' Or BSB? All 26tpi and 55 degrees Quote Link to post Share on other sites
stuart Posted January 13, 2021 Report Share Posted January 13, 2021 And then theres Tecalemit thread Stuart. Quote Link to post Share on other sites
RogerH Posted January 13, 2021 Report Share Posted January 13, 2021 4 minutes ago, stuart said: And then there's Tecalemit thread Stuart. Has this now turned into a competition How about this for a Whitworth thread - Whitworth Instrument at 400tpi Roger Quote Link to post Share on other sites
stuart Posted January 13, 2021 Report Share Posted January 13, 2021 Just now, RogerH said: Has this now turned into a competition How about this for a Whitworth thread - Whitworth Instrument at 400tpi Roger Well you lot started it Stuart. Quote Link to post Share on other sites
Ralph Whitaker Posted January 13, 2021 Report Share Posted January 13, 2021 6 minutes ago, RogerH said: Has this now turned into a competition How about this for a Whitworth thread - Whitworth Instrument at 400tpi Roger I bet no one keeps those taps and dies. Thats 0.0025 pitch. Ralph Quote Link to post Share on other sites
MilesA Posted January 13, 2021 Author Report Share Posted January 13, 2021 48 minutes ago, RogerH said: How about this for a Whitworth thread - Whitworth Instrument at 400tpi Roger Probably on my car somewhere! Miles Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 13, 2021 Report Share Posted January 13, 2021 1 hour ago, RobH said: Or BSB? All 26tpi and 55 degrees ...and that is what the die I have marked ME is. I have re measured the pitch with a bright light and magnifier. My die is 7/16 x 26 ME so we deduce it to be Whitworth form 55 degree, rather than cycle which is 60 degree. The one with the brass scarf is the 26tpi. T’other is 32 tip. Both marked ME Peter W Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 13, 2021 Report Share Posted January 13, 2021 23 minutes ago, MilesA said: Probably on my car somewhere! Miles Miles, am I still looking for a gearstick or are you sorted? Peter W Quote Link to post Share on other sites
MilesA Posted January 13, 2021 Author Report Share Posted January 13, 2021 (edited) Peter Many thanks definitely not now needed. Smeared the inside of the new knob insert thread with JB Weld. Twenty four hours later, tapped it with my just-delivered 7/16 x 20tpi BSC tap. Walked the mile to the lock up in sunshine this morning. New knob threaded on like a dream. The end of a quite a few weeks head scratching this problem. Miles Edited January 17, 2021 by MilesA Quote Link to post Share on other sites
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