Load cell simracing handbrake from 2020 profiles

Hello everyone.

I designed a sim racing handbrake for your rigs that uses alumium extrusions as a base and handle. The rest of the parts are printed in PLA or any other material with more strength (I tried with PLA and it performs well).

Some parts require supports when printed such as:

• Hinge that connects to the axle and spring:

• Upper handle hinge that 

This part also uses two pressure fit 5x11x5 mm bearings. Because the hole is 10 mm deep, two 5 mm thick bearings are needed. I used a rubber hammer to fit them in without damage to them or the part. Pressure fit itself doesen't need to be strong as the assembled hinge is tight enough to not let the bearing move out of the hole.

The rest of the parts should print easily.

As I said I printed everything out of PLA and I leave experimenting with other materials to you.

I used 0,2 layer height, 2 walls and 75% infill for all the parts. Feel free to experient with these if parts fail but I've not had any failures yet.

Aluminium extrusion base I used is 100 mm long and the handle extrusion is 200 mm long.

You will also need:

• Spehrical rod end bearing - Sa4 M4

• M4 steel pillar with a 6mm thread and a length of 90 mm

• Aluminium extrusion 2040 corner bracket with the below dimensions as it matches the load cell holes

• M4 Thumb screw as a spring stopper

• Mould die spring OD 20mm X D10mm, L 50mm, Yellow

• Load cell preferrably with dimensions in the picture below unless you feel like editing parts to fit a different dimension load cell

All can be purchased on AliExpress.

For the electronics I used an AD623 amplifier board connected to the load cell and then the load cell connected to a blue pill STM board which is controlled using FreeJoy software. I will not write out the tutorial for the electronics because there are many ways it can also be done but if anyone is interested feel free to ask and I will explain how I connected mine.

With the parts I also uploaded the whole assembly to help you see where everything goes.

Have fun with this handbrake guys and if you have any questions feel free to ask. I will try my best to answer them.