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Hard turning?

scott-ak

Plastic
Joined
Oct 12, 2021
271668219_10228009469528604_3175573053818775486_n.jpg

Truck transmission parts. I need to make the long one shorter. All I've got are average carbide inserts. Any guidance to keep from fubaring this part would be appreciated
 

partsproduction

Titanium
Joined
Aug 22, 2011
Location
Oregon coast
Ceramic inserts, up to 60 Rc, not happy with interrupted cuts. 2000 FPM so the chip rises red and loops over turning darker before it hit's the lathe, around .010" max DOC and a fine feed, watch your insert nose, but they last quite a while.

Also, regular negative carbide inserts run around 100 FPM, still can't take deep cuts but still works under 50 Rc OK, of course the speed shouldn't make the light grayish blue.
I don't claim to know it all but these things seem to work well for me.
 
Joined
Apr 14, 2018
Location
Airstrip One, Oceania
Truck transmission parts. I need to make the long one shorter.
Just the cylindrical part at the top ? Should be a picnic. Tranny gears are normally carburized, use any old carbide, take off .050 or so on a side, and the core should be about 35 Rc. I usually nail it in one pass with negative rake. After that anything works.
 

Orange Vise

Stainless
Joined
Feb 10, 2012
Location
California
Just use carbide. Chances are you'll get through the whole job on one edge. Worst case two or three.

Carbide is plenty capable of hard turning. It's just not ideal for production applications.
 

scott-ak

Plastic
Joined
Oct 12, 2021
Carbide cut it just fine, it wasn't nearly as hard as I thot it would/should be. Recutting a taper to the internal spline was a pita.

Thanx
 








 
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