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<div class="moz-cite-prefix">How about
<a class="moz-txt-link-freetext" href="https://www.pololu.com/product/2268">https://www.pololu.com/product/2268</a>, much the same but with with
the 38cm threaded rod, for US$50...<br>
<br>
But if you detach the pot from a standard servo you can make it
rotate continuously. With no feedback the PWM position signal then
becomes a direction/speed control and if you make the appropriate
external connections you can hijack the servo positioning loop to
do your bidding (but this could be pretty imprecise).<br>
<br>
See
<a class="moz-txt-link-freetext" href="https://learn.adafruit.com/modifying-servos-for-continuous-rotation/overview">https://learn.adafruit.com/modifying-servos-for-continuous-rotation/overview</a>
or
<a class="moz-txt-link-freetext" href="http://shop.ninjablocks.com/blogs/how-to/7540682-convert-your-servo-motor-into-a-continuous-rotation-motor">http://shop.ninjablocks.com/blogs/how-to/7540682-convert-your-servo-motor-into-a-continuous-rotation-motor</a>
for examples.<br>
<br>
On 21/04/2015 8:20 p.m., Brahm Boelee wrote:<br>
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<div dir="ltr">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. <br>
<br>
Is this a multi-turn servo:<br>
<a class="moz-txt-link-freetext" href="http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=22528&aff=757677">http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=22528&aff=757677</a><br>
<br>
?<br>
<br>
> Date: Tue, 21 Apr 2015 19:47:20 +1200<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:hamster@snap.net.nz">hamster@snap.net.nz</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:chchrobotics@lists.linuxnut.co.nz">chchrobotics@lists.linuxnut.co.nz</a><br>
> Subject: Re: [chbot] Cheap Rack and pinion servos?<br>
> <br>
>
<a class="moz-txt-link-freetext" href="https://nicegear.co.nz/robotics/stepper-motor-29-ozin-200-stepsrev-threaded-shaft/">https://nicegear.co.nz/robotics/stepper-motor-29-ozin-200-stepsrev-threaded-shaft/</a><br>
> <br>
> <br>
> Maybe?<br>
> <br>
> Brahm Boelee <a class="moz-txt-link-rfc2396E" href="mailto:brahmboelee84@hotmail.co.uk"><brahmboelee84@hotmail.co.uk></a> wrote:<br>
> <br>
> >I really want an extension of 40cm. <br>
> ><br>
> >On 21/04/2015, at 7:33 pm, Mark Beckett
<a class="moz-txt-link-rfc2396E" href="mailto:m.beckett@amuri.net"><m.beckett@amuri.net></a> wrote:<br>
> >> <br>
> >> Brahm might have been after one of these.<br>
> >>
<a class="moz-txt-link-freetext" href="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">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</a><br>
> >> <br>
> >> <br>
> >> Andrew Errington wrote:<br>
> >>> 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.<br>
> >>> <br>
> >>> Presumably you are looking for linear motion.
Have you considered a threaded rod?<br>
> >>> <br>
> >>> Best wishes,<br>
> >>> <br>
> >>> Andrew<br>
> >>> <br>
> >>> On 21 April 2015 at 16:17, Brahm Boelee
<<a class="moz-txt-link-abbreviated" href="mailto:brahmboelee84@hotmail.co.uk">brahmboelee84@hotmail.co.uk</a>
<a class="moz-txt-link-rfc2396E" href="mailto:brahmboelee84@hotmail.co.uk"><mailto:brahmboelee84@hotmail.co.uk></a>> wrote:<br>
> >>> <br>
> >>> Hi.<br>
> >>> Does anyone know where to get cheap rack and
pinion servos?<br>
> >>> Preferably with a longer rack.<br>
> >>> Thanks for your help<br>
> >>>
_______________________________________________<br>
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> >>>
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> >>> <br>
> >>> <br>
> >>>
------------------------------------------------------------------------<br>
> >>> <br>
> >>>
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> >> <br>
> >> _______________________________________________<br>
> >> Chchrobotics mailing list
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> >> Meetings usually 3rd Monday each month. See
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> >Meetings usually 3rd Monday each month. See
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> >When replying, please edit your Subject line to reflect
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> When replying, please edit your Subject line to reflect new
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<pre wrap="">_______________________________________________
Chchrobotics mailing list <a class="moz-txt-link-abbreviated" href="mailto:Chchrobotics@lists.linuxnut.co.nz">Chchrobotics@lists.linuxnut.co.nz</a>
<a class="moz-txt-link-freetext" href="http://lists.ourshack.com/mailman/listinfo/chchrobotics">http://lists.ourshack.com/mailman/listinfo/chchrobotics</a>
Mail Archives: <a class="moz-txt-link-freetext" href="http://lists.ourshack.com/pipermail/chchrobotics/">http://lists.ourshack.com/pipermail/chchrobotics/</a>
Meetings usually 3rd Monday each month. See <a class="moz-txt-link-freetext" href="http://kiwibots.org">http://kiwibots.org</a> for venue, directions and dates.
When replying, please edit your Subject line to reflect new subjects.</pre>
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