What would you say this is?

[tab_a]

This came with some other stuff I bought--lathe parts, end mills, etc., and I'm not exactly sure what it is. About 8" long, shank is 1 1/4", cutting diameter measures about 1 5/64 (or more accurately 1.080). Is it just a plain large drill bit, and if so why this point angle?

 

[Ulma Doctor]

it appears to be a tool reground to its present condition
it may have had a very different profile, pre-regrinding

 

[JimDawson]

Looks like an aluminum cutting, Weldon shank, bullnose endmill

 

[FOMOGO]

Is the body on that tapered? Mike

 

[Billh50]

It's an endmill with radius corners. These are used when there is a call out for a radius inside a corner. Used to hand grind and stone a radius on many endmills like that through the years.

 

[David S]

Does the body have a taper? I am with Bill. We used something similar when we were making plastic injection moulds. Ribs always have a taper and can be formed by a tapered end mill. And to provide better drop test performance on our tools we would specify a radius at the bottom of each rib. This was a pita for the machinists and often were not included. If it is indeed tapered it is often stated on the flat of the weldon shank where the set screw lands.

David

 

[tab_a]

Does the body have a taper? I am with Bill. We used something similar when we were making plastic injection moulds. Ribs always have a taper and can be formed by a tapered end mill. And to provide better drop test performance on our tools we would specify a radius at the bottom of each rib. This was a pita for the machinists and often were not included. If it is indeed tapered it is often stated on the flat of the weldon shank where the set screw lands.

David

No it's not tapered. Thanks.

 

[Bob Korves]

I have quite a few milling cutters like that which were pretty obviously reground to the rounded corner configuration to give them new life after the original square corners got chipped off. No reason to throw them away, and better for roughing work.

 

[Billh50]

Bob,
I remember doing a quick radius by hand to touch up a dull endmill because the place didn't have a way to sharpen endmills. They always sent them out fo resharpening.

 

[Silverbullet]

I agree we use to hand grind them for some cast iron milling.