TESTING
too far, the magnet separates the hook from the crosshead to prevent damage. e magnet is strong enough to allow the hook to pull the trigger; and the machine reads tensile loads. Please note that while I refer to the hook mechanism as pulling on the trig- ger, if you were holding the rearm, you
would “squeeze” the trigger, compress- ing it between your nger and the grip in the palm. e rearm xture serves similarly, though it reads the forces in terms of tension instead of compression, as the trigger is pulled by the hook while mounting the rearm pointing down, and locking it in by orienting it based on
the muzzle, nozzle, and grip.
DAM : How is force measurement used in forensic application and how does that di er from its use in product testing? JM: ere isn’t a lot of di erence between the forensic application and the testing application. You’re not likely to test the extraction of a piece of ammunition after it’s been used; once it’s left the casing, it’s spent, and it’s signi cantly changed since it left the barrel. Testing forces of its extraction is probably not going to give useful information. Going back and testing unspent, o - the-shelf ammunition would be helpful if, for example, there was still some of the original, new ammunition available. DAM : How do you think these testing standards will impact the future of de- fense manufacturing? JM: Testing standards ultimately ensure that better quality equipment goes out in the eld. If rearms are used for defense, domestically or internationally, then there will be con dence that the equipment will work. No one wants anyone to use a rearm that fails when least expected. DAM : How have these products impact- ed military applications, law enforcement, and the recreational use of rearms? JM: Being able to test trigger pulls and verify functionality of the rearm is certainly useful, especially if you’re going into a situation where either you need to prove the rearm was raised too high so it couldn’t go o accidentally, or lowered to the point where it could. For law enforcement, the forensic application is surely very important. For recreation, safety is top-of mind, so hav- ing con dence in a manufacturer’s quality control is critical. The L.S. Starrett Co. – Metrology Division https://www.starrettmetrology. com/ rearm About the author: Grace Koennecke is the editorial intern with GIE Media’s Manufacturing Group of magazines.
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