Mystery Sandvik inserts

I have already asked about these Sandvik inserts on the HSM forum without success so far. I got some of these in different sizes included, loose, in a job lot of inserts which I bought on ebay. Yesterday, I came across some for sale in their original box, but even googling and finding a reference to them on a Sandvik website, there is no description of what they are made for.

**LINK**

Hi om,

My best guess would be industrial/production broaching inserts.

Hi i think these are not inserts but are the clamp tops with an adjustable top.The steel clamp goes into the groove and it is adjusted closer or further from the cutting edge to get betterchip clearance on a large turning tool.

David

These are some spares I had when I did real work.

David

I can't quite see how they would work, the ones I have are carbide. Are you saying they deflect the chips coming off a cutting edge they are clamped on top of?

Yes they sit on top of the insert and the clamp holds them in place. You adjust the top plate nearer or further from the cutting edge, to get best chip break, which were flat triangular tips with about a 1.5 to 3mm tip radius negative rake and no front clearance except for tip angle so you can use both sides of tip 6 cutting edges. I could take 0.250" cut feed about 0. 050" at 3000 rpm Roughing out. The chips fly and the tool got hot evan with coolant.

David

They are very old technology, then, dating back to the first of the indexable inserts.

They're chip breakers, depending on the material and depth of cut they were positioned close or away from the cutting edge using the racks. I can remember when they were state of the art but nobody really knew how to use them to the best advantage as the lathes had speed ranges of 1000 rpm tops as they were designed for HSS

That also explains why the table on the back of the packet has been left blank which confused me .