RimfireCentral.com Forums - View Single Post - HS: Rough End Mill marks / finishes causing frame cracking by stress risers?
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Old 07-22-2019, 07:02 PM
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Originally Posted by Gus1957 View Post
Has anyone seen info on the relation to poor finishes caused by end mills tearing the steel in slide release pocket versus where the cracks initiate? Has anyone polished out endmill marks to improve finish to prevent cracking?
Generally speaking the end mill marks are considered surface finish and a factor
is applied as a correction to the basic steel endurance limit. It is the change in section at the back of the magazine well and the pocket for the slide lock that are considered stress risers which also affect the endurance limit. I suspect the stress risers have more influence than the surface finish in this case. Just remember that anything you do now about the surface finish will likely result in a reduction of thickness where you can least afford it.
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