Adjustable SMA torque wrench

thingiverse

Revision V2\r\nI discovered a stiffer spring that can be utilized independently and is simpler to adjust. It was labeled #7 Compression 1-38 L x 5/16 OD x .041 AWG. With the stiffer spring, I successfully broke off a leg from the handle so I revised the handle, pusher, and adjuster design. When printing the handle, I flip it over to prevent supports. Using PrusaSlicer, I added a modifier cylinder around the top leg area and increased the perimeters from 3 to 5. A small drill is used to clean out the pivot pin hole. Once the spring is loaded, I find that the pivot pin stays in place without crimping the end. A compact adjustable click-type torque wrench for SMA connectors is created. Two springs are employed: a 5/16" x 1-1/2" .02" and a retractable pen spring to achieve sufficient force to trip at 4 in-lb of torque. A finishing nail serves as the pivot point. Printed in PETG, the tip features 4 perimeters and 30% gyroid fill. The rest use 3 perimeters and 20% fill. The cal arm is utilized for calibration using a hanging weight or scale. OpenSCAD is employed for design, allowing for parametric adjustments for other uses and spring sizes.