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Posted: 12/14/2011 1:48:31 PM EDT
| when a bolt is high pressure tested before magnetic particle inspection, is it locked into a fixture of sorts and tested, or is it in a barrel and receiver with a gas tube where it reciprocates as it would during normal firing in a rifle? What I'm getting at here is that in a fixture where it doesn't reciprocate, there would be no stress on the cam pin hole, only on the locking lugs and bolt face. It seems to me then that if that were the case, then HPT/MPI wouldn't do the best job of preventing bolts from breaking at that area, on the other hand, if the BCG reciprocates, unlocks, etc as it would in a rifle, I can see that as stressing the whole bolt and maybe being a more thorough test. Thanks for any help. |
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I'm 99% sure that they (whoever that may be) use fixtures. I've even seen them for sale somewhere but can't remember where.
I believe they're held in the fixture by the cam pin hole, if so then there would be a rearward pressure there during the test. I don't see how a small rotation of the bolt would help reveal any defects. Hope that made sense, it did in my head at least. |
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