50kg/110lbs load/force cell from cheap luggage scale
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Cheap and easy luggage scale to 50kg/110lbs load cell conversion
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Updated at source:
Model information
- Source
- Printables
- Category
- Tools
- License
- Creative Commons — Attribution — Noncommercial
Proudly designed with FreeCAD ❤. Join the first FreeCAD-Group here on PrusaPrinters.org!
What's this?
It's a cheap device for measuring weights/pushing forces up to 50kg or 110lbs.
Commercial force sensors which can do that are either really expensive or really big. Or both :)
Is this thing useful to you?
Don't hesitate to hit the ❤ and show some love. I'm always happy to hear from you in the 🗩 comment section. If you have problems printing my files: tell me in the comment section too!
Provided files
I do like to have real CAD-files, when downloading things from others. Most users don't provide files other than .STL-files. These are useless for further manipulation or quick changes. So I'll provide the following files to you:
| Format | Included? | Description |
| STL | ✓ | - |
| STEP | ✓ | Version 214 |
| FreeCAD | ✓ | Version 0.19 Link Branch |
What do I need?
- a cheap (10$) luggage scale, model: Etekcity EL11 or equivalent
- two 3D printed parts
- a few screws
- a few tools (M3 tap, soldering iron, glue, sticky tape)
How is the conversion done?
- use a pair of pliers to unscrew the (glued in) luggage-hook (counter-clockwise :) )
- open the scale (2 screws in the back)
- unscrew the PCB (3 screws)
- unscrew the load cell (2 screws)
- unsolder the load cells' 4 cables
- solder 4 wires as long as you need them (don't go too wild, maybe 50cm max or so) to the board. note colors and position!
- push wires through the opening in the case where the hook was
- put PCB back, secure with the 3 screws
- close case
- add heat shrink tubing to the individual wires and one bigger diameter tube to keep them all neatly together
- solder your extension wires (in the correct oder of course!) to the load cell wires and shrink heat shrink tubing
- cut M3 threads into the load cell case
- put load cell into the case (secure each corner with a dab of glue)
- put on lid, fasten with M3 screws
- add M8 screw, 8mm rod or what you like to act as a piston for the force sensor
If you want a different case, bigger screw holes, whatever: feel free to modify to your hearts content! ### Cheers, Jan
Print Settings
Rafts: no
Supports: no
Resolution: 0.15 … 0.2
Infill: Lid: 100%, case: 20-100%
Filament: PLA+, PETG, ABS, ASA