reamer issue

[Jay Christopherson]

This is off one of my reamers. Everything was normal, then it started doing this. I've not seen this come off a reamer before. It sounds like the reamer is scraping the chamber, rather than cutting.

 

[Alex Wheeler]

Just one flute? Misaligned reamers become single point form tools. Some barrels cut crappy too. Bet I can guess what one your chambering.

 

[Danny1788]

yikes, ive never seen that from a reamer. Maybe its dull or glazed over?

 

[Jay Christopherson]

I've cut two chambers previously with this reamer and both came out very nice (6XC). One second it was cutting cleanly and the next it sounded like an excavator scraping asphalt.

I don't see anything obviously wrong with the reamer. I'm leaning towards the barrel somehow.

 

[Jay Christopherson]

I figure a hard spot in the steel? I decided to finish the chamber, figuring it would just be a learning opportunity from this point. Another .100“ on and the reamer went back to cutting cleanly.

The finished chamber is so-so. The lands are cut square, but the body shows marks that I don't usually see. It'll probably be shoot able, but it's not my finest work. :-/

 

[JasonT]

Are you cutting stainless? Or chrome-moly? Sounds like you hit a concentration of chromium carbide if it's a chrome-moly...or if it's stainless, maybe it's a Lothar Walther...they always seem to cut really hard, like 17-4 or grade 5 Ti

 

[Jay Christopherson]

Are you cutting stainless? Or chrome-moly? Sounds like you hit a concentration of chromium carbide if it's a chrome-moly...or if it's stainless, maybe it's a Lothar Walther...they always seem to cut really hard, like 17-4 or grade 5 Ti

Stainless. It's the same operation I've done dozens of times previously. The only thing I can think of is a hard spot. I chambered another barrel right after and it went like normal.

 

[DaveTooley]

Some reamers just go bat sh!t crazy for some reason. That looks like fine chatter to me. An old trick would be to wrap the body in wax paper, head back in and see if it settles down.

 

[Jay Christopherson]

Some reamers just go bat sh!t crazy for some reason. That looks like fine chatter to me. An old trick would be to wrap the body in wax paper, head back in and see if it settles down.

I remembered that trick and I did try it. No luck though, there was no change at that point.

 

[X Ring Accuracy]

Not pertaining to your issue but as some have said, SS does have hard and soft spots.

 

[Ksracer]

My 6.5-284 reamer cut like that. I blamed it on the tall flutes being able to flex. The reamer guy thought maybe it was sharpened to aggressively. Too hungry is what he called it. Reguardles, it went back to normal as soon as I hit the end of my prebore and the shoulder started taking a heavy cut. The chamber looked fine the whole timt though.

 

[hoz53]

I remembered that trick and I did try it. No luck though, there was no change at that point.

thanks for sharing that

 

[gme]

416 can have inclusions
https://www.sciencedirect.com/science/article/pii/S0010938X11004100

 

[clowdis]

Reamer chatter?

 

[Shrek]

I think the consensus is the barrel had a hard spot in the steel. I’d be interested in how the barrel ends up shooting. Do harder inclusions effect achievable accuracy ? Do they make for inconsistent harmonics ? As a one off it’s not really anything scientific but the anecdotal information would be interesting to me.

 

[Stan Taylor]

My 6.5-284 reamer cut like that. I blamed it on the tall flutes being able to flex. The reamer guy thought maybe it was sharpened to aggressively. Too hungry is what he called it. Reguardles, it went back to normal as soon as I hit the end of my prebore and the shoulder started taking a heavy cut. The chamber looked fine the whole timt though.

Thanks for sharing what you just said.

 

[spitfire_er]

I've seen some barrels with so so chamber work shoot very well. Test it out and see what it does.

 

[Will Henry]

Did you find the pressure required to get the reamer to cut to be greater or lesser than usual? I would set the reamer up between centers or on a test fixture and indicate the cutting edges to see if they are even, If not, I would hone the reamer until they are.
Although my posts may not reflect this, I have had some chambers which didn't come out the way I might have liked. Sometimes, it seems like the more I do, the less I know. WH

 

[Jay Christopherson]

Did you find the pressure required to get the reamer to cut to be greater or lesser than usual? I would set the reamer up between centers or on a test fixture and indicate the cutting edges to see if they are even, If not, I would hone the reamer until they are.
Although my posts may not reflect this, I have had some chambers which didn't come out the way I might have liked. Sometimes, it seems like the more I do, the less I know. WH

No, varying pressure really made no difference. I'm satisfied at this point that it was a hard spot. It's cut two. other chambers that were perfect. It also cut a seating die after that barrel that was perfect. I don't think there's any way to blame the reamer. It was pretty freaky while it happened though.

 

[Dusty Stevens]

I used to get that a lot with a certain barrel brand. Extreme hard spots