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  1. drolds

    Straightening 4140

    The material is pre hardened before machining. It is 28-32 Rc at delivery. It isn't a big deal if I can't straighten it as the parts will pull down straight at assembly. Noel
  2. drolds

    Straightening 4140

    I surface ground the parts flat within .001 bfore I machined them.I will probably talk to our heat treater on tuesday and see what he sugestes. Noel
  3. drolds

    Straightening 4140

    here is a pic of the part.I would be happy if I could get it flat within .002".The steel is 29Rc Thanks Noel
  4. drolds

    Straightening 4140

    Hi I am new to this forum and am seeking advice on the best way to strighten 4140 Ht. I have so parts that have been machined and have bowed .015" ove 24". Is there a way to straighten this without heat. The thinest part is 3/4" and the thickest is 1.5". Thanks in advance...

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