drgoose Posted July 13, 2012 Report Share Posted July 13, 2012 OK, I recently just bent my first bolt. Actually it was not me, but a local gunsmith I found who did not mind me looking behind his shoulder while he did it, but anyway. Thanks to gun nutty I was reading in a chapter on metallurgy that polished steel will produce an oxide film after being heated and the color of the oxide film can be used to guestimate the temperature of the steel. Below is a magnified picture of the root of the bolt we bent and I am wondering if I am reading this right. And if I am reading this right, I still don't know what to do with the information. I want to conclude that the temperature of the bolt did not rise significantly on the areas where no oxide film was deposited. Is this correct? Quote Link to comment Share on other sites More sharing options...
donmarkey Posted July 14, 2012 Report Share Posted July 14, 2012 Yes where the color didn't change there was no change in the temper. I see the cocking cam is still bright, I good indacation that it was done right. Don Quote Link to comment Share on other sites More sharing options...
drgoose Posted July 14, 2012 Author Report Share Posted July 14, 2012 Yes where the color didn't change there was no change in the temper. I see the cocking cam is still bright, I good indacation that it was done right. Don Does the cocking cam participate in absorbing energy from firing a round or is it just the two locking lugs? Quote Link to comment Share on other sites More sharing options...
gun nutty Posted July 14, 2012 Report Share Posted July 14, 2012 The main locking lugs keep things from moving to the rear. The cocking cam just helps cock the action. A soft cam surface will wear quickly and give the bolt a gritty feel. Quote Link to comment Share on other sites More sharing options...
donmarkey Posted July 14, 2012 Report Share Posted July 14, 2012 As GN said the cocking cam just pulls the cocking piece back. On a cock on close action like the swede you won't notice the effects of a soft cam as much as a cock on open action. The extraction cam on your bolt was heated though. That also isn't as noticable in a c-o-c action since you aren't trying to fight the forces of cocking and extraction at the same time like a c-o-o action. Don Quote Link to comment Share on other sites More sharing options...
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