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Screw driver set - limited torque

screwdrivers.jpg Screw driver set - limited torque
compatiability.jpg Screw driver set - limited torque
handle_inside.jpg Screw driver set - limited torque
20190101_152156.jpg Screw driver set - limited torque
way_of_working.png Screw driver set - limited torque
bit_holder_B.stl Screw driver set - limited torque
handle.stl Screw driver set - limited torque
torque_limiter.stl Screw driver set - limited torque
bit_holder_A.stl Screw driver set - limited torque
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Creation quality: 5.0/5 (1 vote)
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3D design format
STL and ZIP Folder details Close
  • STL_TOOLS_v1.00.zip
  • bit_holder_A.stl
  • bit_holder_B.stl
  • handle.stl
  • torque_limiter.stl

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Publication date 2020-03-07 at 14:02
Design number 115411
edge

edge

3D printer file info

3D model description

Created a torque limited screw driver, which is compatible with the original tool bits, but also with the custom version, included here also.

This screw driver is torque limited:
* spring loaded (pre tension could be tuned)
* could add up to 6x steel balls (3 seems enough)
* torque limit is (almost) independent on how hard the toddler will press the driver into the bolt
* by design, maximum tightening torque is a bit lower the loosening torque
* only 3 printed parts are needed, when using the standard bits (choose option A)
* or use the magnetic bits, also included here (choose option B)

Could be used for:
* https://cults3d.com/en/3d-model/game/tow-truck-take-apart
* https://cults3d.com/en/3d-model/various/fire-truck-take-apart
* https://cults3d.com/en/3d-model/game/monster-jeep-willy-take-apart-toy
* https://cults3d.com/en/3d-model/game/dump-truck-take-apart

3D printing settings

BOM:
* printed parts
* 1x M4x40
* 3x steel balls (5mm)
* spring:
- length under load, between: 16 & 21 mm
- diameter: >>4 mm & <12 mm
* 3x washer (D: 9mm max) (used as pivot points)
* 2x washer (D: 12mm max) (clamping spring)
* 2x M4 nuts (with my spring, added 1 extra for a better pre-tension)

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