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Overcomplicated Variable Torque Wrench Ratchet

by Stipa

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Update 2023-02-10: added missing Torque Wrench Ratchet - Insert.stl

REMEMBER: do not leave torque wrench in preload state. Always unscrew cap to 0 position or below when not in use. It is usual practice using torque wrenches.

https://www.youtube.com/watch?v=1IdMfdTlHlc

https://www.youtube.com/watch?v=MgViZ1Y7NjA

As most of my printed parts use M3 hex screws, I got tired of using hex L-key. So decided to make torque wrench for light use.
With default 1.8mm thick spring (parametric spring) it works in range of 0.39 - 1.06Nm (depending on PETG manufacturer spring stiffness will vary). You can switch springs if needed to change Nm range. Designed variable thickness springs (lofted springs) across its length which gives wider range like example 0.5-2.5Nm. Included bunch of various thickness springs.
I tested torque wrench mechanism, it can withstand 3Nm+ load, but since I added ratchet mechanism later I hadn't a chance to test it. Probably it is a weaker point and might break

bolt fastener hex hexagon hexbit nut ratchet screw screwdriver tightener torque wrench bolt fastener hex hexagon hexbit nut ratchet screw screwdriver tightener torque wrench

Source

Thingiverse

What you need to print this: Intermediate Low confidence

Single piece Hardware needed

Supports 1/3

Assembly 0/3

Settings 1/3

Bed size 0/3

Post-process 1/3

Printer

FDM / FFF

File format