[chbot] Cheap Rack and pinion servos?

[Andrew Errington]

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
> <javascript:_e(%7B%7D,'cvml','hamster at snap.net.nz');>
> > To: chchrobotics at lists.linuxnut.co.nz
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','brahmboelee84 at hotmail.co.uk');> <mailto:
> brahmboelee84 at hotmail.co.uk
> <javascript:_e(%7B%7D,'cvml','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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