BIGmiralli Frequent Poster
Joined: 17 Apr 2007 Posts: 38 Location: Boston, Massachusetts
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Posted: Tue Apr 17, 2007 2:35 pm Post subject: |
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The finish from the rolling process should be near perfect, no chatter/tear/etc. If there are any imperfections, they would be from spalling due to excess pressure and be readily visible.
The only difference in profile would be on the major diameter. The cut thread major will be the same as the rough stock. In rolling, however, the major is the resultant of the blank size and the displacement of material upwards. It's form will look a bit like a rounded "M". And this may be your problem, you say the vendor checked the parts with a thread ring... thread ring gages do not check the major diameter. If the preroll blank size is slightly oversize, the excess amterial goes into the major.
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