Mystery tool: What is it??

[AdeV]

When I bought my Bridgeport, it came with a small selection of tool holders. The strangest, and only one I can't identify is this one. Does anyone know what it's for?







The holes on the top & bottom surface go all the way through, and are angled outwards to the bottom edge (i.e. not perfectly vertical - bottom face has a larger PCD). They look to me like they've been drilled, followed by a 9/32" or 8mm square broach.

The letters "N S P" have been stamped or engraved near 3 of the holes (one letter per hole), but I assume this is the manufacturer rather than anything relating to those holes specifically... No other letters or markings are visible.

Any ideas?

[Brass_Machine]

A large fly cutter that uses some kind of insert?  

Eric

[jim]

is it an early "tipped" face mill??

[Stilldrillin]

is it an early "tipped" face mill??

Yes!

Even older than me...... I saw one in a pile of scrap, when I was a new apprentice. It used square section "tools".

Some time previous, we'd gone over to modern throwaway tip cutters.

David D

[AdeV]

 

I'd better get it down to Antiques Roadshow then, that should confuse them 

Thanks chaps. I'm guessing it's not really worth keeping. I don't have any suitable inserts, and I already have a 2" shell mill which does most of my surfacing work (which takes standard triangular inserts).

[andyf]

.... I'm guessing it's not really worth keeping....

But it's bound to come in useful sometime, so I'm betting you don't throw it away

Andy

[AdeV]

.... I'm guessing it's not really worth keeping....

But it's bound to come in useful sometime, so I'm betting you don't throw it away

Damn, rumbled!

Actually, I've got a monster roughing cutter which needs to be mounted on an R8 collet; it's currently on an INT50 (no use to me)... so I can at least re-use that much of it. I guess the rest will make an excellent paperweight!