Chambering question

[Will Henry]

I have some spiral fluted throaters but have never used a spiral chambering reamer. The throaters work fine and are the answer to trying to ream a throat in a 5R barrel. WH

 

[DaveTooley]

I've had issues with chatter on reamers with 40' shoulders going into a roughed out hole. I mostly solved that problem by initially cutting about .100" of the body for support prior to the roughing operation. When I get chatter I wrap the reamer in wax paper and that calms them down.
Just my opinion but if you wreck a barrel and blame the reamer you weren't paying attention.

 

[WayneShaw]

I recently had Manson make a throater to my spec, and it came spiral cut. I never had a problem with chatter with a throater running 100+rpm, but this one did. I slowed down to 60-70, and it cut smooth. Finish was as I expected, but it just wouldn't take the rpms.

 

[jkohler]

Dave on the one I had trouble with it was drilled and bored reamer was well supported in the chamber a good .250. As soon as I started reaming the chatter started. I tried wax paper then cleaning patches different speeds and feeds nothing would work on that one.

 

[Alex Wheeler]

I have had 3 barrels chatter. Not 5r tool push off, actual chatter. In all three cases I tried everything I could, I pulled the barrels out of the lathe before it was too late and ordered a new reamer. In all three occasion's the instant the new reamer started to cut the chatter was gone. With my setup and a good reamer I cant make them chatter if I want to. So when I get chatter, I know its the reamer.

 

[jkohler]

I screwed around with this one longer than I should have for sure. It was a 4 groove barrel. I later put it back in the lathe and run a different reamer in and cleaned it up.