Beetle spinner parts

[Ellis]

I did, but those were for self-righting aid. The flipper didn't really change speed with the springs (maybe fractionally). The servos were at essentially 1:1 to the flipper, so on the ~80deg range that's barely 0.3s from end to end. Still fairly snappy.

Also the springs were actually very simple in the end. A pair of torsion springs from small pound-shop plastic grips, in-line with the flipper pivot. They just float there. This can work for 4-bars and rear-hinged designs too - a terrible picture.

[RogueTwoRobots]

can you run it straight from the receiver?

Yep. The one in Flatulence is running straight from the receiver, although the receiver is powered by the separate BEC that I mentioned. And as Sam said, you could also run it directly off the battery if you're using a 2-cell lipo or battery of similar voltage.

[daveimi]

Oh cool ok . giving the receiver its own power seems like the easiest way to power the beefy servo.

[gizz]

A small thread high jacking here sorry.

Looking at pulleys for both ants and beetles is technobots and beltingonline the way to go or do people here lathe their own and sell to other roboteers? Or is that just too much hassle and expensive anyway?