[chbot] Cheap Rack and pinion servos?

[Brahm Boelee]

Sorry, is that a max of 4 or 5 rotations? They can't continually rotate in one direction? I had no idea.

Thanks for your help guys.

> On 21/04/2015, at 8:43 pm, Andrew Errington <erringtona at gmail.com> wrote:
> 
> A multiturn servo will typically go through 4 or 5 revolutions.  That's probably not enough to drive a 40cm rack back and forth.
> 
> Perhaps you can find a rack and pinion assembly and add a servo to it?  Again, for linear motion you might be better with a threaded rod, or a toothed belt clamped to a ball-bearing slide.
> 
> Best wishes,
> 
> Andrew
> 
>> On Tuesday, 21 April 2015, Brahm Boelee <brahmboelee84 at hotmail.co.uk> wrote:
>> That's good but I need a longer extension than 10cms and pardon my pickiness but it's a bit pricy. Multi-turn servos sound good but it's just finding the pinion on the drive shaft to match the teeth. 
>> 
>> Is this a multi-turn servo:
>> http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=22528&aff=757677
>> 
>> ?
>> 
>> > Date: Tue, 21 Apr 2015 19:47:20 +1200
>> > From: hamster at snap.net.nz
>> > To: chchrobotics at lists.linuxnut.co.nz
>> > Subject: Re: [chbot] Cheap Rack and pinion servos?
>> > 
>> > https://nicegear.co.nz/robotics/stepper-motor-29-ozin-200-stepsrev-threaded-shaft/
>> > 
>> > 
>> > Maybe?
>> > 
>> > Brahm Boelee <brahmboelee84 at hotmail.co.uk> wrote:
>> > 
>> > >I really want an extension of 40cm. 
>> > >
>> > >On 21/04/2015, at 7:33 pm, Mark Beckett <m.beckett at amuri.net> wrote:
>> > >> 
>> > >> Brahm might have been after one of these.
>> > >> https://www.google.co.nz/search?q=central+locking+actuator&tbm=isch&tbo=u&source=univ&sa=X&ei=Jf01VcbDH8jFmQXj7IHAAQ&ved=0CBwQsAQ&biw=1680&bih=913
>> > >> 
>> > >> 
>> > >> Andrew Errington wrote:
>> > >>> Does such a thing even exist? You might have to make your own. Maybe using a multi-turn servo such as a sail winder with a pinion on the driveshaft.
>> > >>> 
>> > >>> Presumably you are looking for linear motion. Have you considered a threaded rod?
>> > >>> 
>> > >>> Best wishes,
>> > >>> 
>> > >>> Andrew
>> > >>> 
>> > >>> On 21 April 2015 at 16:17, Brahm Boelee <brahmboelee84 at hotmail.co.uk <mailto:brahmboelee84 at hotmail.co.uk>> wrote:
>> > >>> 
>> > >>> Hi.
>> > >>> Does anyone know where to get cheap rack and pinion servos?
>> > >>> Preferably with a longer rack.
>> > >>> Thanks for your help
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