Reamer chip loading

T

terry sims

Guest
I have noticed that chips load up on my 6PPC and 6 BR reamers principally behind two opposing cutting edges when advancing the reamer a short distance near the finish of the chamber. This I assume is due to the normal grind of the reamers. What bothers me is when the chip load is slightly different behind the two opposing cutting edges when I take the last 1-2 thous cut. The chambers are drilled and bored before reaming and seem to shoot fine. Is this anything I should be concerned about?
 
Chip loading reamers..

There is a reason for chip loading. 1. Poor or improper lubrication, heat reduction and/or 2. The rake is cut wrong, or 4. A combination with the wrong cutting feed and speed. and one of the other issures.

Rustystud
 
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Rustystud said:
There is a reason for chip loading. 1. Poor or improper lurication, heat reduction and/or 2. The rake is cut wrong, or 4.A combination with the wrong cutting feed and speed. and one of the other issures.

Rustystud
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Nat, most of my reamers only cut on 1-3 flutes for the most part. He asked if he should be concerned about it and I don't think it's anything to worry about. You made me go back and read his post and I would ask him to define 'chip loading'. If he means that chips only accumulate behind a couple of flutes I think that's normal. If by 'chip loading' he means they get packed in then his chambering technique is flawed, don't you think?
 
Chip Loading

Rusty and Mickey what I meant by ” chip loading” is the accumulation of chips behind the flutes. I pull the reamer frequently and re-lube the reamer and chamber with dark cutting oil while cutting at 180 rpm, so I don’t think I have a problem in that regard. Chip loading may mean something different to a machinist and a machinist I am not. Every thing I know about barrel chambering has been gleaned from this web site and I thank you guys and the numerous others for your contributions.
Terry
 
A reamer that is ground CORRECTLY will cut on all of the flutes evenly. I had the same problem earlier until I went with Kiff's reamers.
 
The only thing that pushes chips rearward is the chips that continue to be made during the cut. A constant flushing system, through the bore, often keeps the chips flowing without a buildup.
My first chambering with a flush system was a 6.5-284. I was so intrigued by the oil and chip flow that my first depth check revealed that I had gone about .028 too deep.
It works so well that I think that it might just suck the reamer into the barrel. just kidding....
 
Jkob said:
A reamer that is ground CORRECTLY will cut on all of the flutes evenly. I had the same problem earlier until I went with Kiff's reamers.
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Jim, I agree but very few of my reamers, even those from Dave Kiff, cut on all flutes the same. I do use a barrel flushing system by Greg Tannel and it works very well but I still only go about .050 before backing the reamer out and brushing the big chips off the reamer. Never had the nerve to run it in full depth. Just call me 'chicken'. ;)
 
Reamer chip loading.

I use Greg Tannel's flush system also, using high sulfur dark cutting oil at 60 psi. I've found that if I'm getting chips loading a particular flute, taking a Dreml composite cutoff tool and deepening the oil groove slightly corrects the problem. Be sure to stone off any burrs before refitting the pilot. The normal situation for me is no chips at all when I stop to check progress and clean chips from the catch pan screen.
 
Chip loading or chip welding?

All reamers that cut will load up with chips if you don't clean or flush them frequently. I thought the gentleman was refering to what I call chip welding.
That ruins just as many if not more chambers than packed chips.

Rustystud
 
I did say a "correctly" ground reamer when I should have said "perfectly". But then again, with the staggered flute arrangement on all perfect reamers, it would cause a difference in chip loading from one flute to the next, theoretically.

Jim
 
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