Hey,TilmanBaumann wrote: ↑Sep 19 2018 10:37amHi,
how did you determine the material and thickness requirement for your swing arm? What steel and thickness did you use?
I'm building one right now, and I think I'm building a tank.
I honest to god started with a 10mm thick 80mm wide flat section of steel.
If I don't fsck-up the welding I can use square tube for the arms for sure.
First of all, you need to design the swingarm so that the forces from it's surroundings (mostly reaction forces from the shock and brake) yield as little bending and twisting as possible. Compression, tension and shear (to a certain degree) is favourable.
Square and round (or simply hollow) sections are brilliant because they can handle forces in most directions.
So if you make sure your forces are not acting with an offset to whatever your chosen section is, and if you keep your lengths of flat stock to a minimum (very prone to twisting, and even buckling) you're probably onto something!
Hope that gave some kind of general, boring answer