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Topic: Firgelli linear actuators (Read 2940 times) previous topic - next topic

aggrav8d

Aug 18, 2011, 11:13 pm Last Edit: Aug 18, 2011, 11:32 pm by aggrav8d Reason: 1
http://www.youtube.com/watch?v=SwYYysxuIfA

Finally got them to work.  Turns out one of the PWM pins on my Due is not working right.  Boo!

Would any of you know where to get a $20 linear actuator?  These are way too expensive for hobbyists, which is a shame.

cr0sh

I found a source for used $25.00 linear actuators (6 inch travel) - but they aren't in great shape, and are fairly large (I suspect they were for electric wheelchair seat positioning); I don't have the link handy right now.

If you're looking for something cheaper, then homebrew is where you'll find it; basically couple a gearmotor's output shaft to a piece of all-thread, and put a nut or threaded coupler on it as the "traveling nut", then fix the motor in a housing, and a nut to a hollow extension (many possibilities here, from complete homebrew to using common plumbing fixtures and the like).

Note that you won't get the snazzy features like end-limit switches, position sensors (linear pots), or optical encoders with the homebrew method, but generally these can be added elsewhere into the design of whatever you're moving with the actuator (or in the case of the encoder, you might be able to find a gearmotor with one attached).
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zoomkat

Quote
If you're looking for something cheaper, then homebrew is where you'll find it


Don't forget the need for thrust bearings. Roller skate bearings might do.
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aggrav8d

http://www.youtube.com/watch?v=uPcx0bu2RpI

Homebrew is great if you want to trade time for money.  I prefer to get off-the-shelf components whenever I can.  My ultimate goal is to make a robot that others want to buy.  I want to do this for a living.

zoomkat

Quote
My ultimate goal is to make a robot that others want to buy.  I want to do this for a living.


You could start out by making those $20 linear actuators. If they are any good, I'd be a customer.
Google forum search: Use Google Advanced Search and use Http://forum.arduino.cc/index in the "site or domain:" box.

cr0sh


Homebrew is great if you want to trade time for money.  I prefer to get off-the-shelf components whenever I can.  My ultimate goal is to make a robot that others want to buy.  I want to do this for a living.


You wrote:

Quote
These are way too expensive for hobbyists, which is a shame.


You didn't say -anything- about this being a potential commercial venture. If you are really pursuing this to be a commercial venture, I am sure Firgelli likely has a price break for a certain number of pieces ordered, just like other manufacturers.

I do agree with you that linear actuators are expensive for hobbyists, but them's the breaks! :)
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

cr0sh


Quote
My ultimate goal is to make a robot that others want to buy.  I want to do this for a living.


You could start out by making those $20 linear actuators. If they are any good, I'd be a customer.


This, too; I just ordered one of these for my UGV project:

http://goo.gl/vbBle

24 volt, 6 inches of travel, though fairly powerful (4000 N - definitely need limit switches and such with that kind of rating!) - still, $34.99 (I misquoted the amount before, my apologies). I don't really consider this a lot of money, though, for a used commercial linear actuator.

Even so, I would love to see a cheaper source for hobbyist linear actuators.
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

bld

ooooh, I also got two Linak actuactors laying somewhere... Not sure what to do with them, only got them because they were cheap. XD

Maybe a half powerfull robot arm of some kind? hmmm
captain-slow.dk | non contagious!

cr0sh

Just got my Linak actuator today - I should've read the spec closer before ordering; I had no idea how big it was!

:smiley-eek-blue:

The UPS guy came, dropped off the box, and my wife asked me what I had ordered that was so large (she answered the door). I said "a linear actuator - but it only has a 6 inch stroke" - the box it was packed in was about 18.0 x 18.0 x 4.0 inches, and it weighed a lot. Now, there was a bit of packing, but that actuator was at least 12 inches long from mounting eye to eye in it's fully retracted state.

I wasn't expecting something that large, but I think I have an idea on how to mount it on my robot...

:D
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