segway project: where to get torsion springs (around 20-40ft/lbs)

[AdamHeard]

Originally Posted by dfukuba

The problem with that is garage door springs are many feet long. I want this to be something that would be around 4in long max.

Try cutting one shorter and measuring how strong it is?

[tdlrali]

Also, torsion springs can (should?) only be "torsioned" one way, afaik. i'm assuming you want to turn both left and right?

[Dick Linn]

Here's a torsion spring calculator: http://www.engineersedge.com/calcula...spring_pop.htm There are a couple links to spring suppliers as well.

[kajeevan]

i have a question about your segway are you using first parts to power the wheels like tough boxes and cims.

[dfukuba]

The spring will only be "unwound" from one end at a time. there will be a stop at the other end, while one of the cams rotate the end of the spring.

the scooter uses npc t-64s with a123 batteries 4p10s.

i have found "machined springs" made by heli-cal. They look pretty sweet, they actually have a hub on both ends of the spring. that would be a wonderfull way to make the mehcanism, but i would need to find someway to get one with out ordering in bulk.

[Tom Line]

Call them and ask them if you can get a sample of two parts, and offer to pay shipping. Bet they say yes.