Reamer leaving burr
- Thread starter BCP1980
- Start date
DShortt
Gold $$ Contributor
I'd say it's either that your lubricant is ineffective, which means your reamer is now dull. Or your speed is too high, which means your reamer is dull. Or your reamer was dull to begin with.
As to what to do with it now? I'd try the shoot once, clean including bronze brush and solvent, repeat 10x minimal approach and see what you have afterwards.
Thank you for your response…..the reamer is brand new and seems to be really sharp and the last .005 was cut by hand so speed definitely wasn’t a factor, boelube was used as lubricant.
Sounds like the shoot, clean, etc method might be in my future.
TylerFromMS
Gold $$ Contributor
Where's the burr? Where it's kinda crunchy looking on the land on the side towards the top of the picture?
Driving the reamer too slow will dull one in a heartbeat.
I have one reamer on which it appears the corner of the stone on the grinder was rounded off. A QC issue. Consequently, the throat portion wouldn't cut and smeared the lands just like yours is doing. I need to send my reamer back to the maker but just haven't gotten to it. I already have another. WH
What brand is the reamer? Looks like possibly the cutting oil is breaking down or this was cut dry?
Paul
DaveTooley
Gold $$ Contributor
What was your procedure? Was the chamber roughed in before reaming or did you cut the chamber full length with the reamer?
Another question- Was this barrel new?
Another question- Was this barrel new?
Last edited:
My guess is because the picture is taken by using a mirror is the reason it would look backwards.
I would hate to think how long it would take to ream the chamber turning it backwards, Might be a little oversized too! 2000 rpm and some Nasa Spacelube and it should be done in about a week. Haha
This is a 6ppc….entirely cut with reamer and the barrel is new.
Thanks for your time and input.
DaveTooley
Gold $$ Contributor
Under magnification look at the throat area. Primarily the leade. Looking at the flute face has the edge deteriorated showing a shiny line instead of clean cutting edge?
and a couple of other things besides the burr, where its cutting the groove dia. is pretty nasty also and you need a smaller bushing there is the beginning of galling in front of the leade..
DaveTooley
Gold $$ Contributor
Following the lower edge of the land to the left. It appears there is a corner where the land narrows.
Am I seeing that correctly?
Alex Wheeler
Site $$ Sponsor
Those angled cuts in the groove lead me to believe the throat is off center. They both point to that land instead of in the same direction if it was just ratchet. I bet 180 from that we would see lapping almost back to the neck. Either way that reamer is dull. New or not.
It does look like a dry cut to me, but it also could be stopping, then plunging
again with out clearing the chips.
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