Point Form Cutters

[IllinoisCoyoteHunter]

Yep we use CBN for turning and boring quite a bit here. Definitely faster than grinding, but the tooling is $$$ lol. Nothing in small bores like we’re talking about though.

[Willbird]

Yep we use CBC for turning and boring quite a bit here. Definitely faster than grinding, but the tooling is $$$ lol. Nothing in small bores like we’re talking about though.

I did a lot at one job with PCD inserts. Worked with a salesman from Clapp Dico.

PCD poly crystalline diamond is not supposed to be used on ferrous metals because the carbon in the ferrous metal interacts with the carbon in the diamond and IMHO pulls the Diamond particles out.

BUT he said for low speed stuff like older machines in automated manufacture they had used PCD on cast iron and it worked just fine.

I think a solid carbide bar like was modeled up previously would be worth a try...especially using a form tool to rough the cavity...worst case it just does not work.

I thought it was amazing that they were boring holes as small as .03 or so with solid carbide boring bars....they make them even smaller than that too.

The guy who makes point form dies all day is probably LOL because the way he has always done it works great .

Bill

[IllinoisCoyoteHunter]

Main Body of the die


Ogive section of die that threads into press


Assembly to be held together with 3 1.25” long 8-32 SHC

Will turn a .2235 gage pin with the bullet profile to use as an alignment pin for assembly.

[Willbird]

One thing I remember from the multi part carbide die parts we made that were held in due cases is that part of the “body” would extend into the “nose section” if we were talking a point form die. So say 1/16” of .375 would extend into the nose portion then the ogive would start. If we were making a .375 bullet.

They must have done that for a reason. These were bolt header dies I think in most instances.

[IllinoisCoyoteHunter]

I plan on have a very short section of body diameter in the “nose” (ogive) piece that I will use to know when I’m at the right diameter. Then that will get faced off and then surface ground off after heat treat.