What type of cutting tool is this?

[Oldskool FordParticipant @oldskoolford25120]

Found this in among the grease and crud at the bottom of my milling machine. Cleaned it up and it looks like some kind of cutting insert, but the only ones I have seen are held in place with a little torx bolt. Anyone know what it is?

Dimensions are roughly 11mm by 9mm

[Oldskool FordParticipant @oldskoolford25120]

[Anonymous]

Not entirely convinced, but back in the 60s and 70s there were multislot milling cutters that used serrated HSS inserts similar to that shown. The inserts were held by friction, and designed so that the cutting forces pushed the insert into the pocket. They were presumably introduced to avoid the expense of a large lump of HSS, only a small part of which was used for cutting. Easier to sharpen as well. They were soon superceded by carbide insert cutters.

Holders are still advertised on Ebay at silly prices as they're totally obsolete and the inserts are long since unobtanium.

Andrew

[Brian WoodParticipant @brianwood45127]

I remember those, usually confined to big diameter face mills. They were a job for toolroom grinding when attention was needed to get all the teeth to cut evenly again.

Brian

[larry phelan 1Participant @larryphelan1]

Return it to the crud and let it rest in peace.

[Author]

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