Redoing a crown on a bbl?

[Hiaboo]

I remember an article about redoing a crown on a barrel by getting an abrasive paste and chucking a screw in a lead roundball and coating the paste on the end of the bbl and going at it a bit at a time?


I'd appreciate an idea where this article may be or a link to a similar article or something like so!

 

[rodregier]

Dremel round or conical stone is one way, get the shaft running co-linear with the bore centre. Use a fresh stone, they aren't that expensive.

 

[zxcvbob]

I've done it before using a brass round-head screw and some JB Bore paste (fine Clover Compound would probably be faster)

 

[rcmodel]

+1

A large round-head brass screw & valve grinding compound is the tried & true old-school way.

Chuck the screw in a drill and keep it wobbling around at varying angles and it will grind a true crown.

You can't possibly do it with a Dremel grinder!

rc

 

[Seafarer12]

I wouldn't say you can't possibly do it with a Dremel.

 

[Ohen Cepel]

I've heard of folks using a marble with polishing compound on it. Slow, but they would do it while watching tv at night. Hard to take off too much which would be my concern with the Dremel.

 

[AZ_Rebel]

Dremel round or conical stone is one way...

I wouldn't say you can't possibly do it with a Dremel.

That's why gunsmiths LOVE Dremel tools! They create so much work in fixing the Dremel Dilemas caused by them.

Seriously, you cannot possibly do a consistent crown with a Dremel tool. If you think you can you don't understand the prodedure and problems.

We do them on the lathe with a round stone and lots of cutting oil - run in both directions.

 

[kwetu]

If you use a power tool like a Dremel you will get chattering which quickly gets worse. I use a hand drill and a spherical stone and just work at it slowly varying the angle all the time. I have done many rifles and pistols and never had a problem.
kwetu

 

[rodregier]

I mentioned the Dremel-manufactured stone, I didn't say run it in a Dremel tool. Apologies for not being clearer.

Lathe is the platinum standard, but not all of us have easy access to a lathe.

 

[USAFRetired]

If you DO use a "Dremel-manufactured stone" in a slower speed drill, I would definitely follow it up with lapping compound on a brass screw (or the marble method)