Single Point Diamond Turning
Single Point Diamond Turning
(OP)
Is it possible to machine a series of very small "v" grooves on a maraging steel roll with single point diamond turning? I understand that SPDT cannot be done on steel because of the carbon content. We have already had a roll with an electroless nickel deposition machined and it looked great. But when heat treating (at 590 deg F for 3 hrs.) it developed fine cracks. When we made a trial run trying to roll the form into solder coated copper wire (.085 x .017), the EN began to disintegrate, falling off the substrate roll.
I have been reading about maraging steels. Would one of these alloys be a candidate for directly turning of the grooves using the SPDT? From what I've read, carbon content is nil. I am looking for a finished roll with a hardness somewhere around a Rc 54 to 56.
I appreciate the knowledge and experience so many of you have demonstrated in your replies to other questions. Surely one or several of you will be able to point me in the right direction in solving this problem.
I have been reading about maraging steels. Would one of these alloys be a candidate for directly turning of the grooves using the SPDT? From what I've read, carbon content is nil. I am looking for a finished roll with a hardness somewhere around a Rc 54 to 56.
I appreciate the knowledge and experience so many of you have demonstrated in your replies to other questions. Surely one or several of you will be able to point me in the right direction in solving this problem.





RE: Single Point Diamond Turning
We made very small grooves in different steels using several different methods,single point and multi point tools.
RE: Single Point Diamond Turning
> SPDT is done on EN, which can be quite hard, so it's unclear why that wouldn't work on steel
TTFN
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RE: Single Point Diamond Turning
The other critical area centers around surface finish on the roll. We need to maintain an Ra of 3 or less. It looked like SPDT on the EN deposition really was going to meet our criteria for this project, but apparently the EN would not hold up under a production environment.
RE: Single Point Diamond Turning
The carbon concentration for maraging steels is intentionally low, but that means it would be more likely to pick up carbon during manufacturing. It can be treated to a hardness level of 54 HRC to 56 HRC, so it is a candidate.
RE: Single Point Diamond Turning
A.R. "Andy" Nelson
Engineering Consultant
anelson@arnengineering.com
RE: Single Point Diamond Turning
RE: Single Point Diamond Turning
This project is really becoming a challenge (which I enjoy).
RE: Single Point Diamond Turning
I agree with all comments above re diamond vs CBN. You will lose your tip radius almost immediately if you try to turn the steel with diamond. Iron has a tremendous affinity for carbon. The diffusion of carbon into iron or steel happens quickly and at surprisingly low temperatures.
Bruce
www.accuratus.com