[Lab] Coaxial shafts...

[Ken McKinnon]

Another idea would the counter rotating shaft of a model Helicopter, 
such as 
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

Ken

On 2015-12-06 4:08 PM, Ken McKinnon wrote:
> 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.
> Brass is pretty easy to work with..solders well or you could use two 
> part eopxy to attach to your end parts.
>
> Ken
>
> On 2015-12-06 3:48 PM, Adrian wrote:
>> Coaxial shafts...
>>
>> Alex,
>>
>> 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.
>>
>> 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.
>>
>> Many thanks,
>>
>> ... Adrian
>>
>> *From:*Alex [mailto:alexbarbour at bell.net]
>> *Sent:* 6-Dec-15 1:20 PM
>> *To:* Adrian
>> *Subject:* Re: [Lab] Coaxial shafts...
>>
>> Understand exactly.
>>
>> But what  are the dimensions  and what speeds and torques ??
>>
>> 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.
>>
>> Last alternative is to build your own   when the question 
>> becomes:::       what of the inside bearing betweent the inner and 
>> outer shafts ?
>>
>> Alex B
>>
>>     ----- Original Message -----
>>
>>     *From:*Adrian <mailto:adrian at woodsgood.ca>
>>
>>     *To:*lab at artengine.ca <mailto:lab at artengine.ca>
>>
>>     *Sent:*Sunday, December 06, 2015 7:05 AM
>>
>>     *Subject:*[Lab] Coaxial shafts...
>>
>>     Hello all,
>>
>>     I’m looking for a supplier of clock-like concentric shaft
>>     assemblies to use for a large art display…
>>
>>     Ideally, I’m looking for two independent shafts (one inside the
>>     other) on a common axis to convey two rotary motions from one
>>     side of a baffle to the other.
>>
>>     Hope that you get what I’m after…
>>
>>     Any ideas please?
>>
>>     Many thanks,
>>
>>     ... Adrian (<http://www.wooduino.ca>www.wooduino.ca )
>>
>>     ------------------------------------------------------------------------
>>
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>>
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>
>
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