Re: Designing an M48 0.75 Tap
hy what are photography threads ?
is not only hardness or angles, but more edge sharpening and resistance, thus what matters more is final tool condition
i have crafted reamers, centers, threading holders for indexable inserts, etc
once you start wish to diy, is all about the level of quality that you wish to achieve :
... something low : simply do whatever you wish, and what you do is what you get
... high quality : get material for tooling, rough, heat threat, then grind; contact a local tool manufaturer/sharpner, so to only quote the grinding after heat treat, and discuss with him geometrical conditions that your part must met before sending it to him
about rake angles, i can tell you that there are tools with non standard angles that still work; for your exact application, i could contact someone and find exact technology details, but until then, i will take a look inside a manufacturing catalogue for taps and dies, that, lucky for you/me, i have in house : voila, that u shape is not an u
the od of the tap is not a revolution shape, and that groove is an u with curved sides; from this consideration, you could simply deliver a revolution shape with a normal u groove to your tool sharpener, and he should take care of the details / kindly
Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg