Breakback type Torque Wrench

thingiverse

This model simulates a breakback type torque wrench, which breaks or bends when the required tightening torque is reached. The print is for proof of concept only, not for functionality, especially at a small scale (150mm). A larger scale model can be functional with stiffer rubber bands like those used in slingshots, but it will be limited to lower grade (e.g. 4.6) and smaller size bolts/nuts (not more than M12). For users who rely on this wrench, they can benefit from limiting the torque to the wrench's capacity, causing the wrench to break or bend instead of parts failing. Some minor changes were made: 1. The pieces are now split for easier printing, as many makers had trouble with the original (parts sticking). 2. The fixed jaw is open like an actual wrench to allow installation and dismantling. 3. Special edition text was added. Major Changes: 1. A 3-ply hinge simulates the breakback torque wrench as explained above. 2. Slots were opened for rubber bands. 3. The way for the moving jaw to fully close like an actual adjustable wrench is now clear. 4. The thread was remodeled from scratch with a full thread and smooth start and end, changing printing orientation and adding a hole for pin fixation. 5. The moving jaw length was extended for more engagement with the thread and accordingly robustness. Printer Settings: * Printer Brand: FlashForge * Printer: FlashForge Creator Pro * Rafts: Yes * Supports: Yes * Resolution: 0.2 * Infill: 100 Notes: The Threaded part was printed with "Zortrax M200" at 0.1 layer resolution and 100% infill. Videos: Trial Assembly, Breakback is functioning well, the jaw is fully closing, and the thread is perfectly functioning. The threaded part was modeled from scratch with a very smooth transition to zero.