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What is this weird reamer?

So I found this in the shop the other day. It looks like a normal reamer but it's not round. Four flutes extend to a larger diameter while four extend to a shorter diameter. The shorter flutes are sharpened just like the outer ones so they were clearly designed to cut something, even though they appear to have no clearance with which to do so. The tool has a keyed taper meaning it was intended for use in a heavy machine. The dimple in the tip of the tool does not go through the tool body.  Can anyone identify this weird tool? None of the professors or machinists I have shown it to have any idea what it is. 

Topic by ilpug    |  last reply


Do the bridge pin holes need to be tapered?

I am replacing a bridge, on an acoustic, the new bridge does not the peg holes drilled out yet. I found one site that says to ream with a tapered reamer from some company. This has got me worried because I have drilled the holes to 3/16" but the pegs don't go all the way down. I have not gone to my go to guy yet cuz its almost twelve thirty at night, please help.

Question by addicted2paintball    |  last reply