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  1. gowrishankarz

    Distortion control

    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
  2. gowrishankarz

    4140 straightening problem

    Thanks for all of your replies. TVP, If we were to use a proper flame hardening equipment, what would be your recommendations as far as y velocity & z heating parameters? Thanks again
  3. gowrishankarz

    4140 straightening problem

    swall, I understand there I cannot eliminate the straightening process. All I am trying to do is minimize the distortion so that the straightening process doesn't take as much time as now. What would be your recommendations to minimize the distortion? Thank you
  4. gowrishankarz

    4140 straightening problem

    swall, I don't have any room in the ends to hold these parts in a chuck. The outter surface of the bar doesn't have to be hardened. We are only concerned about the V-groove surface. Is there anyother material which is as strong as 4140 & has better resistance to heat treat distrosion?
  5. gowrishankarz

    4140 straightening problem

    swall, The core doesn't have to be hardened. I was just wondering if the through hardening process would have better control. I cannot induction het treat this part because I cannot put centeres on them. Do you think induction hardening would reduce the bowing?
  6. gowrishankarz

    4140 straightening problem

    TVP, Here is the process 1. We use pre-hardened 4140 turned, ground, and polished material. The diameter is .5" & 25" long. 2. Then we cut the V-groove in a vertical milling machine. We remove about 25% of material. 3. Then we flame harden the edges. We just use a torch & to flame harden the...
  7. gowrishankarz

    4140 straightening problem

    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...

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