One half of a gas check

[btroj]

Rick, are you gonna call them "Half-*** checks"?

[Blammer]

I'd keep a few of those cast boolits on hand just for fun.

got a pic of them?

[geargnasher]

Miha's blocks are intended to be identical. They are machined one half at a time, and the alignment pins are put in later. It's done so well that they all match up. He has a long video on his site showing one block being finished. What amazes me is how he can turn out a run of moulds in less than two lifetimes, there must be fifteen tool changes per half just on the cavity face side.

Gear

[Garyshome]

I think I'll start writing half checks.

[338RemUltraMag]

Miha's blocks are intended to be identical. They are machined one half at a time, and the alignment pins are put in later. It's done so well that they all match up. He has a long video on his site showing one block being finished. What amazes me is how he can turn out a run of moulds in less than two lifetimes, there must be fifteen tool changes per half just on the cavity face side.

Gear

The part he doesnt show is ALL mold halves are run before changing tools. Or it would take "forever"

[geargnasher]

The part he doesnt show is ALL mold halves are run before changing tools. Or it would take "forever"

Not seeing that in the video, or how swapping out and re-zeroing each piece for every operation is faster than automated tool changes, but I'll take your word for it. However he does it, I'm certainly impressed. The repeatable precision and backlash figures on that equipment must run into five decimal places to make the cavities line up so well.

Gear

[cbrick]

Ok, here is what a boolit looks like when ya really, really hafta save on gas checks.



Rick

[ASM826]

If I had got going, I would likely have about 200 of them and being trying to decide if i was going to try loading some or just dump that back in with the sprue for next time.

[OuchHot!]

Skeeter Skelton could have written a whole series of "Jug" invention stories on those boolits. I miss him.

[btroj]

The fact you took half of two different moulds and they lined up that well. Now that is some slick machine work. I am in awe of that kind of precision.

Thanks for the photo Rick, it makes me appreciate my Miha mould that much more.

[Blammer]

I'd use that picture as my Avitar.

[drinks]

Purdy, perhaps not too useful, but cute!

[cbrick]

Purdy, perhaps not too useful, but cute!

Useful? Hhmmm . . . I think if you read post #1 of this thread the usefulness of this boolit may become apparent. But then, maybe not huh?

Rick

[runfiverun]

i'd have to make up a couple hundred and then shoot some groups with them it would at least partially answer the question "can we shoot a gas check boolit without a gas check"

[btroj]

Run, that would only answer half of the question......

[cbrick]

i'd have to make up a couple hundred and then shoot some groups with them

I can't see that being very productive. I am of the school of thought that the base steers the boolit not the nose. I can't believe that this boolit would be anything but EXTREMELY unbalanced in flight, then consider the moment one side of the boolit base is still in contact with the muzzle (crown) while the other side is completely free of the bore yet still has gas pressure behind it. I think a scatter gun would be bench rest accurate compared with these boolits, the only surprise would be if one actually hit the target.

Their most valuable use is having some fun with this thread.

Rick

[cbrick]

Ok, ponder this . . . IF you actually did hit the target with one of these . . . Which side of the boolit was responsible? Plain base or gas check?

Rick

[btroj]

Yes???

[Freightman]

I can't see that being very productive. I am of the school of thought that the base steers the boolit not the nose.



Rick

Think you are right in this.

[btroj]

Try orienting them to see if you can shoot a target with two distinct groups.