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barrel question. Could a ss barrel be too hard to ream????

 
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Old 12-07-2005, 11:12 AM
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barrel question. Could a ss barrel be too hard to ream????

Question is about the 257 stw that I am having built. MY smith has had one reamer break and the other twist trying to ream out the chamber. Both reamers were brand new one broke in half, and the other twisted. My question is could the barrel be too hard to ream. I called the barrel company and they are having the barrel returned to see if they can chamber it. I am in quality controll for a living and this crap has got me thinking of the quality of work that goes into this barrel. I know that this is the last barrel that I will purchase from this company. I have not put the name of the company because I am waiting to see if they make things right. I do know the reamer company asked what barrel that was being reamed and when they heard they acted like they had this problem before. I just wish to get this thing finished so I cam start putting some round down range. Oldfamily
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Old 12-07-2005, 01:34 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

Oldfamily,
In my opinion it would be the reamer that is at fault.
Brand new sharp reamers have been known to "dig in" whilst performing a full thickness cut. This can result in chatter in the chamber and sometimes broken reamers.

On the other hand hard spots in the steel can damage tooling. but this is usually more prominent in chrome-moly steels.

Ian.

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Old 12-07-2005, 03:15 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

CM is even harder then SS so I would think it is the reamer not the barrel.
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Old 12-07-2005, 07:16 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

I had a SS 50cal bbl from a prominent bbl maker and it was almost impossible to ream, it squeeled and squeeked, had all kinds of trouble with it. Sent the reamer back to the company to have it checked, they re-sharpened it and sent it back to me, still the same thing. Then i found the bbl had tight spots in the bore, i returned the bbl, they just lapped it and sent it back. The bbl never did shoot! Hence i never bought another bbl from this company.
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Old 12-07-2005, 08:35 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

Oldfamily,

Could we get a little more information about the reamer. I would assume its a live piloted reamer but want to make sure. If its a solid piloted reamer that has a pilot diameter to large for the bore, you will snap a reamer very easily as the neck of the reamer will be stressed before the body of the reamer engages the barrel fully.

Is your smith cutting a full cut with the finishing reamer or hogging most of the material out with a drill or roughing reamer first?

You should really only remove about 0.050" in diameter with a finishing reamer. Taking a full diameter cut with a finishing reamer is much harder on the reamer. It is very easy to have the reamer bite and either spin in the reamer holder or break.

Not saying your smith is doing anything wrong, it could just be several different things causing this. Like your doing the best thing to do is see what the the barrel maker says and then try to see if it is a reamer issue.

To answer your question though, stainless steel barrels should chamber very easily with a quality reamer and proper chambering techniques. As already mentioned, Chrome Moly steel is much harder then stainless.

Kirby Allen(50)
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Old 12-07-2005, 08:54 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

[ QUOTE ]
CM is even harder then SS

[/ QUOTE ]

I'm not sure that this is true all the time. CM and stainless grades used in BBLs should be fully machinable. It isn't untill they are hardened that reaming would becom a problem. I may be incorrect but having been a machinist for a short while that is how I understand it.

This I do know though, SS will sometimes "work harden" in the blink of an eye. I have seen a knurling wheel destroyed because the machinist student made a return pass with the knurling tool while working a piece of SS. I have also seen a machinist or two totally smoke a drill bit because the feed pressure was to low.

With this in mind I think it is possible for the gunsmith to possibly bear responsibility. One attempt to feed the reamer with the lathe running in reverse while distracted with some other business or conversation may have been all it takes to litterally rub a hard spot (the size of the reamers contact area for that process) in the steel. If the gunsmith fails to notice the problem and get below the hard steel the reamer will fail to cut and will snap or twist.

In short, I would not jump on the BBL maker just yet. And I wouldn't ask the reamer company who is at fault either. Who do you think they are going to blame with the gunsmith buying their reamers.

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Old 12-07-2005, 09:07 PM
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Re: barrel question. Could a ss barrel be too hard to ream????

[ QUOTE ]
Moly steel is much harder then stainless.

[/ QUOTE ]

Not to hijack the thread Kirb but how is this true? 4140 or similar metals have a certain "toughness" to them but they are not hard per se until they are heat treated. SS is much tougher in it's annealed state and as you are well aware much stringyer (?). The chip is continuous often.

I yield back this thread to the gentleman from Montana.
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