Manual Lathe Job, Start To Almost Finish

Almost finished after 22 hours including setup, the mill work has yet to be done however.

rings_zps5vba9ryc.jpg
 
Pretty wild, interesting to see the end result. 3 rings cut from a one piece blank. Forgive me, what is the proper term for the blank.

That is harder then it looks I know that. How did you separate each part? A cutoff tool and if so how did you keep the part from being launched across the shop.
 
pepi said:
Pretty wild, interesting to see the end result. 3 rings cut from a one piece blank. Forgive me, what is the proper term for the blank.

That is harder then it looks I know that. How did you separate each part? A cutoff tool and if so how did you keep the part from being launched across the shop.
Click to expand...

Not so hard as you might think, 4 individual laser cut blanks, 25 1/2" OD X 23 1/2" ID from 1/2" plate. Holding them was the challenge they also moved around enough to give the average tenth seeking hobbyist nightmares. All parts are the same size within .015 when clamped, afterwards it is not my problem.

They came out well, holding the Z axis dimension was a bit difficult however.

Speeds and feeds were 28 RPM's (about 200 FPM), .008 IPR feed and a .05 DOC for roughing, .012 DOC, .006 IPR for the finish using a TPG 432 insert with molded chip breaker and TIN coating, the chips were a constant battle from start to finish. Normally I would push the feed and DOC until the chips break but was uncertain of the setup and decided not to overload the clamps holding the parts. They were Laser or Plasma cut blanks so had to deal with the interrupted cuts at the HAZ inside and out, this took its toll on inserts.
 
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