Sorry about that: I forgot that it's a private group (it was early and I'm old).
Here's the photo:
Dude wants to take 1/4" off the OD.
I was referring to the sketchy way he has it in the chuck (plus negligible clearance to the ways). Several folks suggested a faceplate. Here is a sampling of the comments, some good, some no so:
Carry it to a real machine shop (as opposed to some random dude with a Grizzly lathe on a heavy table like me).
Ask if you can watch (or record) from a safe distance.
Then pay them.
Change that Chuck
my word, we could be watching an example of the Darwinian theory of evolution before our very eyes
Seriously, this is bonkers.
To machine that case hardened crownwheel, you need CBN even with the interrupted cut, but taking into consideration of your setup, I doubt you’ve ever heard of CBN
I cut gears for 28yr. Anything from the space shuttle to Milwaukee hand tool. The guys are right, their going to be case harden approximately .030 -.040 case roughly 36rc on c scale and higher. Plus core hardness. It's going to be an interrupted cut on the gear teeth,this will beat the hell out of the turning tool (carbide insert) the tool post will take a beating also. Not to mention by shorting the gear teeth you'll be adding more stress to the heel of the gear tooth it self by removing the case hardness. The bearing load contact on the tooth under will put more stress at the heel.
Bearing contact under heavy load should be full length on tooth. By shorting the gear tooth you just removed the case hardness their making it weaker. If the gear will run under light load you may get away with this , but if it will be under a high shock load from start up load. I'd think twice about it.
9" Angle grinder
My favorites:
Buy one.
It’s called parts store
This is why "I don't do the FaceBook."
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