a question about dies

Gallery, Projects and General > How do I??

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BaronJ:
Hi Guys,

I think you may find that the notch and dimples are used during the manufacturing process to secure the die blank in forming and grinding stages. Simply a convenience that they are there.

vtsteam:
Having seen the second photo now, I'm voting or Fergus opinion that it's thread chaser since it seems to lack taper. It looks like there's a little relief on one side to start without cross threading, but no taper.

Arbalist:
I've got a couple of solid dies that have leads on them for cutting new threads so it's not just split dies that have them. One of my best dies was a solid M6 encapsulated into a plastic handle with a guide bush. Sadly I broke the handle in a senior moment... I still have an M4 combined die and stock somewhere that I bought from Buck & Hickman.

Fergus OMore:
Actually, a die with two dimples and a slit are intended to hold the die with the two dimples and for the slight- and I mean slight opening of ONE of the holes to do the first -or initial cut and then when reversing back, to release the pressure to cut a gnat's cock more. Obviously, this initial cut puts the whole thing out of square or round but is properly formed -going back out.

I have to point out that quite a lot of cheap taps and dies have no leads to speak about. This is where one has a tool and cutter grinder- however crude- to grind the tapers on the leads of the cheap taps- or sharpens the blunted ones. One of my old diseased mates used to put the edges back on the leads of his taps with a triangular hand stone. Me, Oh Hell, I've sort ignored the so called advice of lots of experts( in their opinion) and I made up diamond dresser to shape the grinding edges of some of my wheels. If your inverted rear parting tooling has a 140 degree 'female' vee along the cutting edge, I don't know any other solution.

Regards

Norman

Houtenkrullen:
Hello everyone,
If I may add nu two cents...
I live in the Netherlands, and haven't seen a split die in all my life. Have read about them though.
Over here all regular dies (as far as I know) are of the type as discussed. We have dies with hex exteriors for rethreading damaged threads, although I haven't seen many of those. Most people use a regular die for rethreading (including myself. If anyone knows a reason not to, please let me know) All my dies have all the holes yours have. And all my holders have screws for all the holes (which I find a bit peculiar)
I can't say for sure that yours are the same kind, but you might just give it a try. Maybe you ended up with a "continental set", but it might just work fine as is.
Cheers,
Peter

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