Reaming a barrel bore

homebrew.357 · Aug 19, 2020

Hi guys, I`m getting a T/C pull through reamer from U S and will be mounting on a steel tube to ream from .443" to .450", so a .0035" cut with oil through to flush out chips. Now the way I do this is with the barrel turning in the lathe at slow speed, slow infeed, is this ok ? as most say the reamer should be turning and barrel still :nono:

. Barrel steel is 4140 and takes me three days to hand ream one, so this finishing reamer will be a god send, one pass through and job done. :cool:

. Homebrew.357.

gappmast · Aug 20, 2020

It makes no difference which one is turning

homebrew.357 · Aug 20, 2020

Yes, that's what I thought, thanks mate and stay safe over there.

kenton · Aug 20, 2020

I was under the impression the optimal situation was both spinning to help cancel out any alignment errors on either the tool or work piece.

I think that is for gundrilling mainly, it probably won't make a ton of difference for reaming.

Butch Lambert · Aug 21, 2020

kenton said:
I was under the impression the optimal situation was both spinning to help cancel out any alignment errors on either the tool or work piece.

I think that is for gundrilling mainly, it probably won't make a ton of difference for reaming.

Barrelmaking shops that I have been in had the barrel turning, but not the drill.

gappmast · Aug 21, 2020

Having both turning in opposite direction does help alignment when drilling a hole. In this case the hole has been established a reamer will only follow a hole.

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Reaming a barrel bore

homebrew.357

Aluminum

gappmast

Cast Iron

homebrew.357

Aluminum

kenton

Stainless

Butch Lambert

Titanium

gappmast

Cast Iron

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