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Posted by Michael on February 20, 2007, 3:24 pm
>> "Mike"
>> > Hi - I've been working on a 6 legged robot for almost two years now.
>> > Currently I'm using Hitec HS-81MG servos. I guess I'm not entirely
>> > pleased with them - and I would like to pursue other alternatives.
>> > Right now I have them acting as the joints for the legs, which I would
>> > not recommend doing as I later found out they don't have any bearings
>> > (!?!!@%@!).
>> > Anyways - I want to replace them with something more solid, that gives
>> > me more control over movement, and ideally something with the same or
>> > more torque. I don't care about speed - they're wayyy faster than what
>> > I need. So - does anybody know of any very small linear actuators or
>> > motors that would have enough torque for this application? (or motors
>> > + gearboxes)
>> > Thanks!
>> > -Mike
>> There were a couple of other posts on linear actuators this week, take a
>> look because there are some very nice replies.
>> Recently I've bought a couple of linear actuators for my project from
>> Firgelli Auto, but these are too much for your application (30 pounds of
>> force). They have an affiliated company (firgelly) that is just starting
>> to
>> commercialize micro linear actuators, and they claim that one of the
>> applications is for robotic legs (small robots). Search google for
>> firgelly
>> micro (or mini) linear actuator.
>> Cheers
>> Padu
> Hi - I saw those discussions, but unless I missed something, they were
> all about much larger devices. I'm looking for small! Each leg segment
> on my robot is only 6cm long - so the smaller the better!!
> I just took a look at the Firgelli ones - and they don't seem like a
> very good fit for me. Specifically, their force is a little low (18N
> max) and their stroke is incredibly small (2cm). Maybe if they had a
> larger stroke I could compensate for their low force with leverage -
> but geeze - 2cm isn't alot to work with.
> Squiggle motors seem possible as well (http://www.newscaletech.com/
> squiggle_overview.html) - but they suffer from having even less torque
> than the Firgelli ones. I also have no idea what the pricing on those
> buggers is, and calls and voice mails to them have gone completely
> unanswered.
> -Mike
How about something like this?:
http://www.mutr.co.uk/prodDetail.aspx?prodID —5
Michael
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> Currently I'm using Hitec HS-81MG servos. I guess I'm not entirely
> pleased with them - and I would like to pursue other alternatives.
> Right now I have them acting as the joints for the legs, which I would
> not recommend doing as I later found out they don't have any bearings
> (!?!!@%@!).
> Anyways - I want to replace them with something more solid, that gives
> me more control over movement, and ideally something with the same or
> more torque. I don't care about speed - they're wayyy faster than what
> I need. So - does anybody know of any very small linear actuators or
> motors that would have enough torque for this application? (or motors
> + gearboxes)
> Thanks!
> -Mike