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Another idea would the counter rotating shaft of a model Helicopter,
such as
<a class="moz-txt-link-freetext" href="http://www.goodhelicopter.com/attoptoysyd811yd815-helicopter-parts-body-set-main-gear-set-hollow-pipe-main-frame-motor-cover-upperlower-main-blade-grip-set-connect-buckle-set-inner-shaft-bearing-set-small-fixed-set-p-7186.html?zenid=9r0n5ueq7mm9rd2d154kl23n66">http://www.goodhelicopter.com/attoptoysyd811yd815-helicopter-parts-body-set-main-gear-set-hollow-pipe-main-frame-motor-cover-upperlower-main-blade-grip-set-connect-buckle-set-inner-shaft-bearing-set-small-fixed-set-p-7186.html?zenid=9r0n5ueq7mm9rd2d154kl23n66</a><br>
<br>
Ken<br>
<br>
<div class="moz-cite-prefix">On 2015-12-06 4:08 PM, Ken McKinnon
wrote:<br>
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<blockquote cite="mid:5664A3C8.3050302@rogers.com" type="cite">
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Discount Hobbies in Orleans (as I suspect most hobby stores would
have) hollow brass tubes in various diameters from about 1/8" or
so up.<br>
Brass is pretty easy to work with..solders well or you could use
two part eopxy to attach to your end parts.<br>
<br>
Ken<br>
<br>
<div class="moz-cite-prefix">On 2015-12-06 3:48 PM, Adrian wrote:<br>
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<title>Coaxial shafts...</title>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Alex,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">I
want to independently rotate two or possibly three arms –
like the hands of a clock – and am looking for a “shaft
within a shaft within a shaft” assembly. Each arms is to
be separately controlled by 360 degree servos (not
continuous rotation) or steppers. Right now, I am looking
to see what’s available and so far I’ve drawn a blank. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">To
your response, the Dremel only provides one shaft and I’m
looking for more. As for bearings, it would be a ball race
or just cold-metal (brass on brass)… I am still looking
for possible ideas.<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Many
thanks, <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">...
Adrian <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US"> Alex [<a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="mailto:alexbarbour@bell.net">mailto:alexbarbour@bell.net</a>]
<br>
<b>Sent:</b> 6-Dec-15 1:20 PM<br>
<b>To:</b> Adrian<br>
<b>Subject:</b> Re: [Lab] Coaxial shafts...<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Understand
exactly.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">But
what are the dimensions and what speeds and torques
?? </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Could
you use flex drives such as For Dremel of Canadian
Tire have a cheepie for $3.00 If You use these one
must be sure to turn such that the inner cable is
tightened not unwound.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Last
alternative is to build your own when the question
becomes::: what of the inside bearing betweent the
inner and outer shafts ?</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Alex
B</span><o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid black
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<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">-----
Original Message ----- <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:#E4E4E4"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:adrian@woodsgood.ca"
title="adrian@woodsgood.ca">Adrian</a> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">To:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:lab@artengine.ca"
title="lab@artengine.ca">lab@artengine.ca</a> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Sent:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
Sunday, December 06, 2015 7:05 AM<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Subject:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
[Lab] Coaxial shafts...<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p><span
style="font-family:"Calibri","sans-serif"">Hello
all,</span><o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">I’m
looking for a supplier of</span> <span
style="font-family:"Calibri","sans-serif"">clock-like</span>
<span
style="font-family:"Calibri","sans-serif"">concentric
shaft assemblies</span> <span
style="font-family:"Calibri","sans-serif"">to</span>
<span
style="font-family:"Calibri","sans-serif"">use
for a large art display… </span><o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">Ideally,
I’m looking for two independent shafts</span> <span
style="font-family:"Calibri","sans-serif"">(one
inside the other)</span> <span
style="font-family:"Calibri","sans-serif"">on
a common axis to convey</span> <span
style="font-family:"Calibri","sans-serif"">two
rotary</span> <span
style="font-family:"Calibri","sans-serif"">motions
from one side of a baffle to the other.</span><o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">Hope
that you get what I’m after… </span><o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">Any
ideas please?</span> <o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">Many
thanks, </span><o:p></o:p></p>
<p><span
style="font-family:"Calibri","sans-serif"">...
Adrian</span> <span
style="font-family:"Calibri","sans-serif"">(</span><a
moz-do-not-send="true" href="http://www.wooduino.ca"><span
style="font-family:"Calibri","sans-serif""></span></a><a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="http://www.wooduino.ca"><a class="moz-txt-link-abbreviated" href="http://www.wooduino.ca">www.wooduino.ca</a></a> <span
style="font-family:"Calibri","sans-serif"">)</span><o:p></o:p></p>
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<pre wrap="">_______________________________________________
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1. subscribe <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://artengine.ca/mailman/listinfo/lab">http://artengine.ca/mailman/listinfo/lab</a>
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<pre wrap="">_______________________________________________
Lab mailing list
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2. then email <a class="moz-txt-link-abbreviated" href="mailto:Lab@artengine.ca">Lab@artengine.ca</a> to send your message to the list</pre>
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