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[DPRG] Does anyone have any experience with "servo savers"?
Subject: [DPRG] Does anyone have any experience with "servo savers"?
From: Ed Koffeman
edk at kinetric.com
Date: Wed Dec 12 13:56:16 CST 2007
Yes, they are as you describe.
They don't have a very large range of motion before the coil spring
inside binds, but they work well.
Any hobby store that carries R/C car or airplanes will have some.
They do come in several sizes, from more than one manufacturer.
You can cut the springs down to remove the preload and reduce the
initial rate.
It's a little difficult to get them back together sometimes if you are
using the original springs, but it's doable.
Ed Koffeman
Ed Paradis wrote:
> Hi everyone,
>
> I was looking up servos for yet-another-robot project, and I saw some
> items called "servo savers". They seem to be springs that dampen
> shocks to your servos.
>
> I am interested in building series elastic actuators, and if these
> things work like I think they do, they're a really simple way of
> implementing a series elastic motor.
>
> The idea in a series elastic motor (simply) is that your motor drives
> a spring, which then drives your load, be it wheels or levers.
>
> >From what I can find online, thats exactly what these servo savers
> could do. They seem to be more to protect your servo if a crash tries
> to back drive your servo by compressing a spring. The energy of the
> shock goes into compressing the spring instead of cracking a gear in
> your servo.
>
> With a properly rated spring (probably one with a much lower spring
> constant than typical for these things), you could have a great series
> elastic motor that is available ''off the shelf''.
>
> Has anyone seen one of these in person? Does this seem possible?
>
> Ed
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>
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