Adjustable SMA torque wrench
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Revision V2 I found a stiffer spring that can be used alone and is easier to adjust. It was labeled #7 Compression…
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Updated at source:
Model information
- Source
- Printables
- Category
- Electronics
- License
- GNU General Public License v2.0
Revision V2
I found a stiffer spring that can be used alone and is easier to adjust. It was labeled #7 Compression 1-38 L x 5/16 OD x .041 AWG. With the stiffer spring I managed to break a leg off the handle so I revised the handle, pusher and adjuster design. When I print the handle I flip it over so it prints without supports. Using PrusaSlicer I put a modifier cylinder around the top leg area and increase the perimeters from 3 to 5. I use a small drill to clean out the pivot pin hole. I find that once the spring is loaded the pivot pin stays in place without crimping the end.
Original
A small adjustable click type torque wrench for SMA connectors. I used two springs, a 5/16" x 1-1/2" .02" and a retractable pen spring to get enough force to trip at 4 in-lb of torque. I used a finishing nail as a pivot. Printed in PETG. The tip was printed with 4 perimeters and 30% gyroid fill. The rest used 3 perimeters and 20% fill. The cal arm can be used to calibrate the wrench using a hanging weight or a scale. OpenSCAD is used for the design so it is parametric for other uses and other spring sizes.
Print Settings
Printer Brand:
Prusa
Printer:
I3 MK3S
No
Supports:
No
.2
Filament: Prusa PETG
Category: Electronics