I've noted in a collection some taps /dies with a constant 32 TPI ove
the smaller sizes 1/4 through 5/8, some have WF on them, make is mostl Totem. These appear to have come from the UK, anybody know for what the were used ?. I can't find any info in the Machinery Handbook. Thanks
-- Alan in O
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Thanks.
In message , Alan in Oz writes
The WF could be Whitworth Form (55 degree). If so then in those sizes they are probably part of the ME (Model Engineer) range which dates from
1912. They range from 1/8" upwards in 40, 32 and 26 t.p.i depending upon diameter.These are the 32TPI version of Model Engineer's threads. There is also a
40TPI version. They are 55 deg form. Not Cycle thead.3/8" x 32 t.p.i. is still the standard thread for bushes for 1/4" shaft potentiometers for volume controls etc.
Thanks for the replys, learn something new everyday
-- Alan in O
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