REFLECTOR: Roll trim mod suggestions

[Ron N VelocityXLFG]

Got my belt and pulleys here

http://www.mcmaster.com/#timing-belt-pulleys/=prz4ya



On 12/11/2013 5:27 PM, Don Johnston wrote:
> Thanks for the replies!
>
> I thought about a limiting cable that would prevent the motor from 
> rotating.  But making sure it was strong enough and making sure it 
> didn't cause a problem in "slack" mode was problematic.
>
> The clutch is an interesting approach. But the cost and space made 
> that a non-starter.
>
> So I've removed the parts and ordered the smallest timing pulley I 
> could find with a .25" bore.  I'll open it to 5/16" and try that. The 
> nice thing about the timing belt is that you can control how much 
> slippage is allowed with spring tension.
>
> Thanks again,
> Don
>
>
> On Wed, Dec 11, 2013 at 4:58 PM, Brian Michalk <michalk at awpi.com 
> <mailto:michalk at awpi.com>> wrote:
>
>     Something like this:
>
>     http://www.reell.com/catalog/index.php?main_page=product_info&cPath=5&products_id=37
>
>
>
>
>     On 12/10/2013 8:51 PM, Don Johnston wrote:
>>     Requesting suggestions from the hive mind...
>>
>>     After hearing all the comments about the stock roll trim
>>     slipping, I decided that I would go another way. When I saw
>>     Geoff's solution, I felt it was perfect.
>>
>>     Except he has a motor with a .25" shaft where mine is 5/16". The
>>     pulleys for the 5/16" shafts are only available in a larger
>>     diameter and that caused interference issues with the aileron
>>     torque-tube bellcrank and cables.
>>
>>     So I decided to go with a system similar to what is in my Cessna.
>>     Chains!  Absolutely no slipping with chains. And it works great.
>>     Positive motion and no slipping. In fact, it will pull the spring
>>     around the pulley. Which causes it to derail and get caught in
>>     the bellcrank. :-(
>>
>>     I'm wondering if anyone has any suggestions on how to put in a
>>     (simple) motion limiting mechanism. It would have to be on the
>>     motor or chain. My first thought was microswitches that reverse
>>     the motor direction. But I cant' figure out how to trigger the
>>     switches.
>>
>>     Don
>>
>>
>>
>>
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