Introduction: Skateboard Compliant Shock Absorber
This is a shock absorber for a skateboard. It goes in place of the riser, under the truck. It has six pieces that bend under load, and help reduce the shock transferred up to the legs of the skater. I chose to make this a compliant mechanism, or a part that bends rather than act on pivot points, for two reasons. The first is the reduced number of parts. With only one part, assembly is very straightforward. The other is that compliant mechanisms are very lightweight, because they have so few parts. This means that the skateboard gets no heavier with this addition. Before I printed the part, I did a stress analysis. You can see in the screenshot of Fusion 360 that I took above, under high loads the part bends. The material used for the stress analysis was ABS, while it was printed in PLA. ABS was the closest to PLA I could find in the material library. Also shown above is a failed design. It was too stiff and didn't bend correctly. I changed it, performed the stress analysis, and it worked perfectly. The last thing shown is a video, because I believe in testing things. I dropped both sides of the skateboard from equal height. The first side I drop, the one with the absorber, bounces less than the side without. This proves that it works. This absorber is a great design that works much better than I thought it would.
Step 1: Print the File
This is an STL file of the absorber. The first step is to print it. NB - This must be printed on its side.
Step 2: Here It Is!
This is what it should look like.
Step 3: Remove the Truck
Remove the truck of the skateboard.
Step 4: Attach the Absorber
Put the absorber over the screws. It must go on upside down, as shown.
Step 5: Attach the Truck
It's that simple.
Participated in the
3D Printed Contest