Okay, I was hoping I could do this myself but I’m stumped. I’ve decided to take a crack at designing a swing-arm truck, ideally keeping it as simple as possible and, most importantly, making it easily mountable to most conventional decks. Here’s what I have so far:
The distance where the arms meet the baseplate is 218mm, and the arms add 56mm each, making for a total 330mm wide. This should hopefully make it wide and stable enough for mountainboard use. The arms will be held on the baseplate with M8 shoulder-screws, around which will also be placed a pair of torsion springs (and spacers if necessary) to help with shock absorption and returning the truck to center when not actively steering. Using the trampa springs as a guideline, I want to choose torsion springs of similar tensile strength. I calculated months ago- I forget exactly how- that one trampa spring requires about 57kg of force to fully compress. Even assuming that’s correct, I haven’t been able to figure out how to convert that into radial force. I’ve been using this site’s calculator: https://www.acxesspring.com/calculating-constant-force-on-a-coil-compression-spring.html But every combination of parameters I put in either seems to come out too high, or doesn’t have enough degrees of travel. Can anyone help me with this please?