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Threads for screwed shank End Mills and Slot Drills

Where to obtain taps and dies

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Jerry Wray26/04/2015 15:04:13
84 forum posts
4 photos

I need to clean-up some threads in screwed shank collets and end mills.

I believe these threads are Whitworth form of 20 tpi with diameters equal to the shank, either imperial or metric THe tread form and pitch are the same for both.

Harold Hall's Metalworkers Data Book confirms these dimensions.

Can some one advise me where I can obtain taps and dies to these sizes. I have tried the usual sources.

Thanks

Jerry

DMB26/04/2015 15:41:40
1585 forum posts
1 photos
Tracy Tools?

Edited By DMB on 26/04/2015 15:42:18

Jerry Wray26/04/2015 16:27:14
84 forum posts
4 photos

Tracy were my first thought. If I consider for example a 6mm shank 20 tpi is 1.27 mm pitch (25.4/20 ). I don't know if this i sufficiently accurate as a 6mm collet has an internal thread of almost an inch.

Jerry

Bazyle26/04/2015 19:28:49
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6956 forum posts
229 photos

Thread chaser perhaps, or even thread file (from Chronos)

JasonB26/04/2015 19:34:17
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25215 forum posts
3105 photos
1 articles

Could you not grind up the screwed shank of a blunt cutter to make a "tap" to restore the internal threads and a thread restoring file as Bazyle says for the external threads

Jerry Wray26/04/2015 20:15:06
84 forum posts
4 photos

Thanks Bazyle and JasonB,

I have a very worn 6mm shank End Mills which I will try to grind into a (hopefully) suitable form to act as a tap. I also have some files which was my father's which he used to use to cut large Whitworth threads for earth moving machinery. I just need to dig them out, from his toolboxes (not from the earth).

Good job I am now retired.

Jerry

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