Chambering question

[Plumsask]

Hello All,

I just have a question regarding chambering that I'm hoping someone can help answer. I live in Canada, wanted to support local business, I sent off a brand new reamer and go/no go guages to a well know barrel manufacturer to have a new stainless carbon fiber wrapped barrel for a hubting build on 6mm Rem AI. They had run quite a bit over on the time estimate for delivery. I emailed and inquired Bout the status. I recieved an call today and was told that the brand new Manson Reamer (HSS) had ripped the steel of the barrel and then chattered making the barrel not usable. They said they tested the reamer on another blank and it cut fine. They said they are switching to only using carbide reamers to avoid this. Is this a common issue with HSS reamers? The reamer was brand new. I kinda felt like I was being fed a line to buy them time. Any thoughts...?

Thanks

Plum

 

[ChristianSilver]

Sounds very strange.. taking you for an expensive ride. Good luck getting things sorted out.

 

[jkohler]

I just had a reamer from them that chattered so bad it cost me a blank. I tried everything under the sun to get it to stop and nothing worked. i sent the reamer back to them.

 

[WSnyder]

^^^Wow that's certainly not common but we've all heard of the anomalies here and there.

 

[TylerFromMS]

My only chattering reamer is a Manson, but it only did it on a seating die (and giraud pilot now that I think about it) and cleaned up with wax paper. It goes through barrels super smooth, though.

 

[Plumsask]

Thanks for the feedback everyone, they are going to do a new carbon wrapped barrel to my spec, so I don't believe I'll be out any $, just a longer wait. Was hoping to be doing load development by now.

 

[LVLAaron]

Sounds like a problem with the barrel steel, not the cutter.

 

[Ggmac]

I bet the new barrel is your old barrel . Always put a witness mark , known only to you and take a picture, when dealing with someone new . Just a small punch mark , file mark , sandpaper scratch, etc .

 

[Alex Wheeler]

Mansons angles are more prone to chatter in my experience. They are a little too sharp in my opinion. Its the only reason I dont buy them. However, most of them I have used do still cut well. But to say hss chatters more than carbide is not true. Its about the angles not what the reamer is made from. And if it cut good on another barrel, then the reamer is not the problem.

 

[urbanrifleman]

Mansons angles are more prone to chatter in my experience. They are a little too sharp in my opinion. Its the only reason I dont buy them. However, most of them I have used do still cut well. But to say hss chatters more than carbide is not true. Its about the angles not what the reamer is made from. And if it cut good on another barrel, then the reamer is not the problem.

I had my latest reamers "circle ground". Different grind.

 

[hoz53]

I had my latest reamers "circle ground". Different grind.

where at?

 

[Alex Wheeler]

I had my latest reamers "circle ground". Different grind.

Im not familiar with that. Pushing 150 jgs reamers without a problem so Im not keen on changing, but whats the difference in the grind?

 

[dminn1]

Doesn’t sound like chatter was the issue but rather galling. I’ve seen this rarely happen on cnc and manual machines when the flush system fails to clear the chips. Some reamers due to grind or various other reasons don’t clear chips very well. A sure sign of this is a sudden spike in spindle load often accompanied by a loud screech.

 

[B Nettesheim]

Sounds like operator error to me

 

[jackieschmidt]

Sounds like operator error to me

^^^^^^^^
i suppose one of the more difficult things to say is……”we messed up”.

 

[SKWERLZ]

Sounds like a barrel or operator issue, I did have one barrel give me a challenge on a reamer that cut a few other barrels beautifully.

 

[urbanrifleman]

Im not familiar with that. Pushing 150 jgs reamers without a problem so Im not keen on changing, but whats the difference in the grind?

The back of the blade is an arc. Gets rid of the chatter. It's the same as a Hendrickson ?? I may have that name wrong.

 

[Carl S]

It may be operator error or the grind on the reamer-may be to sharp.i would do what was necessary to correct the job and make the customer happy.it doesn't do anyone any good ripping people off.

 

[Will Henry]

Chattering of a reamer is usually caused by one (or both) of two things: the angle of the face of the cutter and/or the spacing of the flutes. All flutes should be ground ahead of center and the spacing should be staggered. For instance, the first flute would be .002 ahead of center, the next, .004, the next, .006, then .004, .002, and .004 again. No cutting edge is directly opposite the other, and all will act as a scraper, with no tendency to dig in. Some makers may set the flute at some predetermined amount ahead of center and stagger the edges radially.
I do think the best profile for the cutting edge is to have a margin of around .010" with the relief curved down.
In recent years, I bought quite a few reamers, from one maker, which had inadequate relief and would not cut without excessive pressure being applied.
I have had numerous reamers from Clymer which chattered badly, and were a trial to use. I have never had any problem with a reamer from Henriksen (the best maker out there IMO), minor problems from a Manson and one bad reamer from JGS (thirty-some years ago, mind you). That reamer was replaced and the replacement was fine. WH

 

[LVLAaron]

Try a spiral-fluted reamer sometime.