Where to obtain taps and dies
Jerry Wray | 26/04/2015 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 |
DMB | 26/04/2015 15:41:40 |
1585 forum posts 1 photos | Tracy Tools? Edited By DMB on 26/04/2015 15:42:18 |
Jerry Wray | 26/04/2015 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 |
Bazyle | 26/04/2015 19:28:49 |
![]() 6956 forum posts 229 photos | Thread chaser perhaps, or even thread file (from Chronos) |
JasonB | 26/04/2015 19:34:17 |
![]() 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 Wray | 26/04/2015 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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