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Source for 1" x 12 tpi Whit taps and die.

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Bluechip:
Eugene, Matthew ..

It is as far as I know.
I can't think of anything else it could mean.
I have B.S.Brass Thread stuff marked eg 1/2" x 26  WF but I prefer W.F. as Whitworth Form ..
As Matthew says  55o and with the root / crest radii etc. to spec.

Dave

awemawson:
Whitworth defined not only the 55 degree angle, but also the percentage of rounding of the crests and troughs, so theoretically any diameter and pitch could be Whitworth Form. Then a standard series of preferred diameters was established, each with a corresponding Hex size of head / nut. However the hex sizes were later reduced by 'one size' as a material reduction exercise (WW2 I think).

Eugene:
Thanks men,

We're somewhere close then; I'll give them a bell tomorrow and get the full SP.

Eug

Pete W.:
Hi there, Eug,

I suggest that you have a think about using chasers.  They know that they are available for 12 tpi Whit Form, I have a set.

You'd need to 'creep up' on the final diameter but they's handle the thread form part of the exercise.

If you start the thread by single pointing, you could change to the chaser to finish - registering the thread shouldn't be too difficult at 12 tpi. 

Eugene:
Gents,

Thanks for all your help.

Tracey Tools confirmed today that "Whit Form" is just their designation for parts that are not listed within the normal BSW or BSF range. The threadform is indeed "proper" Whitworth 55 degree, roundy tops and all, and is applied to "specials" which a 1" x 12 tpi is.

When the time comes I'll order some up.

Eug

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