Engine boring bar inserts

[jl1132]

can you get diamond inserts for it?

Im not sure, I am not that familiar with inserts.

 

[Larry Dickman]

Im not sure, I am not that familiar with inserts.

Neither am I. This has nothing to do with engine work, but we run a couple parts that are very abrasive cast aluminum. Carbide inserts would wear, so we had to constantly adjust size (+/-.0002)
Then I tried using PCD inserts. No comparison. Finish like a mirror, haven't had to adjust for size in a couple years.

FWIW, the inserts I'm using are Sumitomo.

 

[CarbideBob]

Hi Bob, those numbers are pretty close to what I'd expect for a 1/4" I.C. and a 1/32 corner radius. And he's already confirmed the I.C. and thickness (3/32")

Perhaps your definition of close and mine are different in the insert world. .. I might be too picky about such.
Numbers work out to .260 IC and .037 corner rad.
Why strange? That is outside the world of even poop "M" inserts. It is at the low end of a "R" which means somebody forgot to grind the IC.
It is near a 21.52, this a common brake drum/disc insert.
Looking for in stock somewhere on the planet with a 3 or 4 in the rad shows nothing. I'm still searching.

This rad should in a perfect world should only leave less than a tenth peak to valley. Given the unground and holder layout a .001/.002 back side burr would not be unexpected.
Options: Try a C or P insert. Note that the back wall of the holder is zero so care when loading.
Send me some used or new inserts to me and I can grind the IC and some different rad sizes to try. I can do this....OP will have to pay shipping costs.

I expect that is steel sleeved two strokes. If so PCD is not going to work. The interruption on the ports another problem for tool edge.
T land helps this but still the added and released tool pressure not so good for roundness.
Bob

 

[jl1132]

Perhaps your definition of close and mine are different in the insert world. .. I might be too picky about such.
Numbers work out to .260 IC and .037 corner rad.
Why strange? That is outside the world of even poop "M" inserts. It is at the low end of a "R" which means somebody forgot to grind the IC.
It is near a 21.52, this a common brake drum/disc insert.
Looking for in stock somewhere on the planet with a 3 or 4 in the rad shows nothing. I'm still searching.

This rad should in a perfect world should only leave less than a tenth peak to valley. Given the unground and holder layout a .001/.002 back side burr would not be unexpected.
Options: Try a C or P insert. Note that the back wall of the holder is zero so care when loading.
Send me some used or new inserts to me and I can grind the IC and some different rad sizes to try. I can do this....OP will have to pay shipping costs.

I expect that is steel sleeved two strokes. If so PCD is not going to work. The interruption on the ports another problem for tool edge.
T land helps this but still the added and released tool pressure not so good for roundness.
Bob

Thank you, I'll send you a PM as to where I could send you some of these.