To back up a little, how do you know these parts are of uniform wall thickness, and straight, when they came back from the heat treater? Should there not have been a stress relief done before the honing?
Stress relieved is not the same as annealed condition, and uneven removal of stock is going to cause warpage to occur.
How do you attain initial straightness of the part before you begin cutting. Are you certain that the wall thickness is uniform?
Are you maintaining concentricity somehow, or does the part only runout after you back off the steady rest?
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |