Hornady Lock-n-Load Primer Alarm

thingiverse

This is modeled after the Hornady Lock-N-Load Control Panel Primer Level Sensor. It slips over the primer tube and the clamping shaft collar from McMaster, which activates a microswitch when primers drop to a certain level. The hole at the top guides the tube when adding more primers, eliminating the need to remove it when running out. A microswitch with 40gf can be found on Digikey: https://www.digikey.com/product-detail/en/omron-electronics-inc-emc-div/SS-5GL111-3/Z5074-ND/5236949. Other needed components include 2.5mm x 16mm Socket Head Screws (https://www.mcmaster.com/#91292a018/=1csp5qf) and an 11/16" OD 1/8" ID Clamping Shaft Collor (https://www.mcmaster.com/#9961K11). To hook it up, two wires are soldered to the Common (C) and Normally Open (NO) terminals and then wired to an Arduino or buzzer and battery. A design replacing the Hornady control panel is in progress but not yet ready. The shaft collar is slightly too big; wrapping a little tape around the primer follower solves the issue. Replacing screw holes with small nubs for the microswitch to snap into is being considered, along with leaving it as is. Suggestions to improve this model are welcome. The Onshape model can be found at https://cad.onshape.com/documents/2362d81c22c2550b93c8a902/w/49f22b86d0acb70227fc4368/e/f9fc14c8d9d6c6ee9510c4f1.