High Temp 330 Stainless Bar

[Toolman]

This is a motor shaft that drives a gigantic fan blade in a high heat condition. The bar is too big to fit through the bore of my Lathe so I got to use the steady rest for a change. Used my indicator base with the push through pins to locate on the Bedways and get the bar true to the bed ways before I spin it up. Faced the end and put a center in it.The material is pretty tough and Iscar carbide tool company came by the shop and gave me a couple inserts to try out. I got the whole job done with just one edge on one insert. The piece of aluminum sheet stock where the bar meets the lathe Chuck is there to keep the machine from shoving the bar back into the Chuck.

 

[Toolman]

Good chip break. I think I need a overhead crane for this Lathe. Lol

 

[joecfd1]

I had a Romi for 30+ years or so. Great machine. I sold it a few years ago when I retired.

 

[Toolman]

I had a Romi for 30+ years or so. Great machine. I sold it a few years ago when I retired.

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I think they’re one of the best lathes ever made. I especially love the carriage stop system.

 

[mattyc]

This is a motor shaft that drives a gigantic fan blade in a high heat condition. The bar is too big to fit through the bore of my Lathe so I got to use the steady rest for a change. Used my indicator base with the push through pins to locate on the Bedways and get the bar true to the bed ways before I spin it up. Faced the end and put a center in it.The material is pretty tough and Iscar carbide tool company came by the shop and gave me a couple inserts to try out. I got the whole job done with just one edge on one insert. The piece of aluminum sheet stock where the bar meets the lathe Chuck is there to keep the machine from shoving the bar back into the Chuck.

Any trouble with chatter in the middle of that long bar?

 

[Toolman]

Any trouble with chatter in the middle of that long bar?

I had expected some chatter but got none. I used a .015 radius tip which probably helped. I used a .050 depth of cut and a .010 finish. I had a .012 cross travel per revolution and fractured the insert from the side load. I cut it down to .008 per revolution for the rest of the job. This stuff was pretty tough.