TESTING
across the X-axis. When it makes contact with the trigger and starts pulling, it moves up along the Y-axis, producing a crest to the value of the load going up until it goes past that point where the trigger sets o the rearm and then
as a comma separated values (.csv) le, which can be read by programs such as Microsoft Excel. Many people will use a spreadsheet format so they can graph- ically represent that data outside of the controller software. ey can see speci c data point targets and the time incre- ments when those samples were taken, and compare the distance, the load, and even the speed at that point. DAM : What inspired e L.S. Starrett Co. to create the trigger pull testing xture? JM: We were approached by a rearms manufacturer looking to test trigger pulls speci cally. ey were looking to signi - cantly increase the ease of running tests compared to their existing method. We designed and manufactured a xture to lock in the rearm in a downward pointing direction with a hook mechanism and magnetic safety so it didn’t damage the rearm. If it pulled
TOP LEFT: Starrett designs and manufactures force systems that match customers’ unique ap- plication requirements. Change Spring Force Fixture allows opera- tors to quickly switch between test springs and load cells, saving time and costs. TOP RIGHT: New Starrett Rapid
ABOVE: Photo shows hook and barrel support on a Starrett Trigger Pull Test Fixture. The tipped cylinder on the bottom-left of the image is the barrel support, ZKHUHWKHƮUHDUPLVDOLJQHGEHIRUHEH - LQJVHFXUHGLQWRWKHƮ[WXUH,WRSHUDWHV pneumatically – the cylinder receives DLUSUHVVXUHWRVHFXUHWKHƮUHDUPLQWKH Ʈ[WXUHDQGWKHDGGLWLRQDOF\OLQGHUVRQ the bottom right can be swapped out to DFFRPPRGDWHGLƬHUHQWEDUUHOOHQJWKV
it goes back down. If there’s something for it to catch after that, it’ll go back up again. ere’s a point that the trigger will come to a hard stop where pulling on it won’t engage any mechanisms, and the load will go back up at that point. However, a test designer would have included a step to stop the test before or during that point, so it doesn’t damage the rearm. Generally, the force system data export
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DefenseAndMunitions.com SEPTEMBER/OCTOBER 2023
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