ID cutoff tools and madness!

[Bob Engelhardt]

Wedge inserts, they are not brazed in use, there is nothing to stop someone from doing so however, this makes them difficult to change (-:

Yeah, I know. I still wouldn't get into chain buying holders trying to find one that the inserts fit. Brazing is harder than fastening with a screw, but not very hard. I'm an HSM'er and I like making-do.

[Bented]

Before I invested in a holder that the insert might not fit, I would just braze an insert on a piece of CR. My name is Bob and I'm an HSM'er

Wedge inserts, they are not brazed in use, there is nothing to stop someone from doing so however, this makes them difficult to change (-:

[Tobias-B]

Hi Bob,
as a fellow HSMer with delusions of adequacy, I was going to suggest
-gasp-
trying to MAKE a holder.

t
I can quit any time.

[Bob Engelhardt]

Before I invested in a holder that the insert might not fit, I would just braze an insert on a piece of CR. My name is Bob and I'm an HSM'er

[old mart]

Another thing that could be a clue is the shrink packing, if they were from one of the big boys, they would be in a box, that makes me think they could be GTN.

The NC3030 is a Korloy grade.

https://www.mcctcarbide.com/jv/resou...e-grade-chart/

[JoeLee]

Thats what I feared, there are several very similar things made by the big boys who like to keep their tooling proprietry. The grade number is the best chance of narrowing it down.

I found an advert with parting inserts with a 20 on them.

https://www.kbctools.ca/catsearch/14...2IC20%22%5D%5D

That looks close, I was going to say valenite.

JL.....

[vectorwarbirds]

Thats what I feared, there are several very similar things made by the big boys who like to keep their tooling proprietry. The grade number is the best chance of narrowing it down.

I found an advert with parting inserts with a 20 on them.

https://www.kbctools.ca/catsearch/14...2IC20%22%5D%5D

I believe Tomato and you have nailed it down, GTN inserts. At 20 bucks each and more where they came from I will buy a holder for GTNs instead of throwing them out, well honestly I wouldn't throw them out as I can't bring myself to do that, so drawers of stuff I don't use. Thanks much yall!

[vectorwarbirds]

If they don't fit a GTN3 holder, at least you will have no problem getting inserts for it.
Here are some pics of GTN inserts, see if they are the exact same shape.

https://www.ebay.co.uk/itm/174713129...8AAOSwmjZgY~Fm

These SP300 / NC3030 inserts are the same shape as the ones I posted earlier but are taller and they do not interchange. I have the holder for the SP300 / NC3030 inserts but not one for whatever the others are. I don't particularly want to buy holders just to guess it out. I've got enough stuff like that already!

[Bented]

Have been using insert tooling for 30+ years.

Never take the last insert out of the packaging and discard the package, this tells you who made it and what it is (-:

[old mart]

The ebay inserts are not the same as the mystery inserts. The mystery inserts have a shoulder.

Thats what I feared, there are several very similar things made by the big boys who like to keep their tooling proprietry. The grade number is the best chance of narrowing it down.

I found an advert with parting inserts with a 20 on them.

https://www.kbctools.ca/catsearch/14...2IC20%22%5D%5D

[Doozer]

I will say that the Shars paper catalogue does explain cut off inserts very well.
And other inserts too. I highly recommend it.

-D

[Illinoyance]

The ebay inserts are not the same as the mystery inserts. The mystery inserts have a shoulder.

[old mart]

If they don't fit a GTN3 holder, at least you will have no problem getting inserts for it.
Here are some pics of GTN inserts, see if they are the exact same shape.

https://www.ebay.co.uk/itm/174713129...8AAOSwmjZgY~Fm

[vectorwarbirds]

They look like standard GTN-3 or GTR-3 inserts. Very common.

Thanks TC I think you nailed it! Now I can buy a holder for them.

[J Tiers]

I have the reverse..... holder but no more inserts. May as well toss in the bin when the last insert gives up.

What you have is scrap carbide (unless you know what it fits).