What is this tool

[benmychree]

Doesn't make sense for a valve seat reamer. I've done the job hundreds of times and without a pilot I can't imagine it would work right. Also the angle is way to steep for any engine I've worked on.

I tend to agree with Ulma Doctor, it looks like a purpose built tool, maybe one that never quite got finished.

Chuck it up and see what it does....

John

Many devices have valve seats besides engines.

 

[Aukai]

I can see you have a point there, that broadened my horizon.

 

[Suzuki4evr]

A look at the cutting edge profile, will make its rotating direction a bit more obvious.

Looks like a valve seat reamer, but they usually have a guide to center them on the valve stem guide.

View attachment 319122

None that I have seen before when I was still in the automotive engineering trade.

 

[Chipper5783]

Did the previous owner run a CNC mill? As stated above, that would work great as a chamfer mill (I have a couple that look like that).

 

[Aukai]

Don't know, it was with an Ebay lot

 

[Janderso]

I agree, a valve seat reamer

A valve seat reamer has a guide rod to keep perpindicular/square?????

 

[brino]

A valve seat reamer has a guide rod to keep perpindicular/square?????

Jeff, the suggestion was made above (first by @whitmore I believe) that it could be a seat reamer for a recessed valve seat like in a fluid/steam fitting.
The shank of the reamer riding against the ID of the pipe could be the guide.

-brino

 

[Aukai]

Not sure it was an Ebay lot Chipper

 

[mmcmdl]

It's a form tool used in a lathe or mill .

 

[Suzuki4evr]

A valve seat reamer has a guide rod to keep perpindicular/square?????

Yes

A valve seat reamer has a guide rod to keep perpindicular/square?????

Yes