dogman wrote:Nice work Justin. I'm really impressed with the effectivness of the thicker torque arms! I've been of the opinion that the thin ones were decorations, but clearly 3/16 makes a huge difference.
Well, I think the results more or less confirm what had generally been figured out the trial and error way: that torque plates made from 1/8" steel ARE pretty much decorative, as they don't in-and-of themselves have enough strength even with 14mm axles to resist the stall torque of most hub motors.
The effect of going to 3/16" was impressive, and I see no reason now why we wouldn't go further to 1/4". The reason I didn't get plates made from 1/4" stock before was that as the metal gets thicker, the accuracy of the bore made with the waterjet cutter gets worse and worse, so the tolerances suffer (we saw this even in the difference from 1/8 to 3/16, and had to hand-file a lot of them). However, since we've seen that a really snug fit isn't nearly as beneficial as the extra thickness, then it's not so much of a problem anymore!
jag wrote:Besides the thickness, the material plays a role. Tools made from crome vanadium alloy are much stronger than mild steel. What's the max torque of a good quality 10mm wrench? Maybe better material in the torque arms would be a way to go.
I will be picking up a 10mm wrench on my next hardware store visit and will do a spinout test on that too, since it seems to be a popular makeshift arm.