carbide on a 10 inch atlas, am I wasting inserts

10 inch Atlas, the lighter one, not a Clausing. I've been running CCMT inserts because I don't enjoy grinding and my HSS looks like a butter knife by Thursday. Interrupted cut on a gear I'm cleaning up, and I'm chipping the corner off every other pass. People in here talk like carbide on these machines is a moral failure. Is it actually the wrong tool, or am I just ham-fisted.

On that lathe, on an interrupted gear, you're donating inserts to the scrap can. HSS will knock the corner off and keep going. Carbide wants rigidity you do not own. This isn't a religion. It's the machine.

It's the cut, not the tribe. A light Atlas and a geared interruption will chip a sharp CCMT. Drop the stickout, drop the depth, or use a tougher corner and accept a worse finish. HSS is the less annoying answer. It isn't the only answer.

I run the cheap inserts from the hardware store on everything and my finish is basically a mirror. I think people overthink this. Just go slower and don't lean on it.

Ken, a mirror you haven't shown isn't a data point. Delaney, what rpm, what depth, and how far is the insert hanging out of the holder? 'Go slower' might be the wrong direction if you're rubbing.

About 400 rpm because I got scared. Depth was probably too much, I was trying to get under the weld blobs in one pass. Stickout is maybe an inch and a half because the holder hits the gear otherwise. I can hear you all sighing.

Inch and a half of stickout on Atlas is the problem, not carbide as idea. 400 rpm can be rubbing if tool is dull-cornered and doc is big. Try 0.015 inch and shorter stickout even if you have to come at the gear from other side. Then we see if insert lives.

Or grind a knife tool and stop feeding the insert company. Both can be true. I'm not running his lathe.

Shorter stickout, lighter pass, insert survived two gears. Finish is duller than I wanted. I'm keeping the carbide for the cleanup and I'll grind HSS when I care what it looks like. Nobody won. I'm fine with that.

That's the whole argument. Leave it there.