I came across a product called Black Magic (http://www.distortioncontrol.com/Black%20Magic.pdf), for reducing distortion during machining. I was wondering if anybody here have used this product. If so, please post your review.
Thank you
Hello everybody,
We are having a lot of problems with heat treating round 4140 material. This part is .5" in dia & 25" long. It has a V groove machined into it. We just need the edges of the V groove to be hardened to about 55 Rc. Right now we are flam hardening the edges & this makes the part...