Re: Speed controllers [TANKS]

[Bill Hamilton <seeker-at-phoenyx.net>]

On Thu, 16 Feb 2006, Frank Pittelli wrote:

> Dan W wrote:
>
> The tricky bit is developing a mechanical servo linkage that will rotate the 
> control pot on the controller in one direction regardless of which direction 
> the servo rotates.  That is, the controller pot needs to go the same way when 
> the servo goes in forward or reverse.  Alternatively, you can use a separate 
> servo channel to control the speed of both controllers.  I think that's what 
> Rick did and it worked well on the battlefield.


That's easy, actually.  Mount a control horn on the pot (or on a gear 
assembly attached to the pot, if you need more than 90 degrees of travel). 
Place the servo so that the control horn on it is pointed directly at the 
center of the pot control horn.  Connect with a control rod, and you're 
done.  Either way the servo turns, it will pull on the rod, so the motor 
will always speed up as the servo turns away from center.


-Bill Hamilton