Apr 1, 1996 — Commonly used inserts for hard turning are CNGA, DNGA, VNGA, CNMP and TNG styles. Positive inserts for hard turning are CCMT, CPGM, and DCMT. Mr ...

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Do you have an adjustable die wrench? If you look at some of the dies (not all, but some) the round die is split, like a “C”, and there’s a teeny little screw in there to tweak the gap in the “C”. Which tweaks the size of the thread, ever so slightly. If so, yours could be mis-set. Probably too far open. (There are reasons why you might want to do that, but unfortunately, they don’t normally mention that the dies can be tweaked, so nobody realizes what’s going on if they get out of adjustment.) Sometimes there’s an adjustment screw on the die wrench too, so you can tweak it twice, if you’re not careful.)

Buy proper hss ground t and d’s, and youll find your results will be what others have done. Cheap far east t and d’s are a waste of time.

I have never tried threading gold before but I have Sterling. I find Sterling threads pretty well but I have only planned on the threads to have a one way application. I occasionally make small pendants for funeral ashes and once the container is threaded shut I slightly deform the device to keep it threaded tight.

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Keith has been helping clients with their retirement needs since 1988. His primary goal is to help people protect their money from market volatility.

Cutting threadby hand

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I am cutting threads like a nut and bolt for threaded earrings. Each piece comes out nicely, sharp clean cuts. The problem is when I screw them together they round. The pieces are not heat treated or hardened. Is that the problem? I’m mostly doing 14kt and casting both pieces, but it seems to happen in any metal so I’m sure it’s me. I’m using the jewelry tap/die tool, a little burr lube, the correct size, both pieces are 1.9mm. I’ve seen some other pieces that others have done and they are crisp.

I help people determine how much risk is appropriate for their personal financial needs. I work with the following types of plans:

Cutting threadtypes

Mar 21, 2024 — This process involves determining the optimal rate at which the end mill rotates (speeds) and the rate at which it advances through the material (feeds).

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1.9mm is a strange size as most metric t and d’s are either 1. 1.5 2 etc in finished thread size. Then you need to look up engineering tables that give you the material thickness to start with for the male, ie bolt and and the drill size for the female to use.

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Charlie- It’s best to use drawn and wok hardened wire not cast. Cast metal is softer and more porous. Nickle white gold would be the best.

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From what you describe, I suspect that its the tap and die are not matched. you say jewellery? t and d? didnt know there were such things, as I use proper engineering t and d’s.