Ratchet screwdriver with torque control

thingiverse

I designed this ratchet screwdriver to be adaptable for all 6-Kant 1/4 of inch bits. The bit rotation is locked while unscrewing and for screwing the spring provides a torque control. The maximum torque depends on the spring stiffness and on the length of the spacer. To adjust the maximum torque for screwing I also included a M5 nut in the back of the handle that allows to increase the torque screwing on the back of the screwdriver a M5 bolt (This part is optional). The ratchet is a single piece that have to be printed twice: one for the head of the screwdriver (have to be inserted in it) and one moving with the spring. I used a spring of 6.5x18mm, if you have a spring of a different lenght just modify the spacer length on CAD file. Print Settings Printer: Anet A8 Rafts: Doesn't Matter Supports: No Resolution: 0.2 and 0.1 for ratchet Infill: 30% Notes: I used PLA, but probably it is better to use ABS for ratchet part in order to have a better strength Post-Printing How I Designed This Designed using Onshape https://cad.onshape.com/documents/c5b52e24723fe923a645d039/w/258c2a93f2b9f099f0a24fbc/e/a740761469400e540fff60b1 You are free to improve it, just post it!