Re: [CAD_CAM_EDM_DRO] Motor Size /Joystick Question

One way I have seen used is to include the variable resistance
from the joystick as part of the timing circuit of a 555, set up so
that the resistance changes, change the output pulse rates, these
were then used as a trigger for the stepper driver circuits.

Bit simplistic description but hopefully you get the idea.

Dave M.

----- Original Message -----
From: "skerbitz" <skerbitz@...>
Subject: [CAD_CAM_EDM_DRO] Motor Size /Joystick Question


>I have an project that uses bipolar stepper motors to pan and tilt a
> metal table weighing about 20 to 30 pounds. The steppers are not
> controlled using a PC, but by using a joystick. I know that an
> oscillator circuit (555 type) can be built to run the stepper motor
> drivers in 'standalone' mode, but ususally this involves using
> external switches and doesn't provide variable speed control with a
> joystick, which is what I want. As I move the joystick I would like
> the speed to increase or decrease just as it would say in a normal PC
> game.
>
> I've spent a LOT of time searching on google and found a few
> interesting things, the closest being this :
>
> http://www.imshome.com/osc.html
>
> which plugs into IMS's bipolar stepper motor driver.
>
> Can anybody think of something cheaper/better ?
>
> And now for another issue, I don't have much of a feel for how
> powerful the bipolar motors need to be to pan/tilt the table. Lets say
> for the sake of argument that the motors and the table were geared,
> like 2 cogs on a bicycle with a chain, to provide more torque at lower
> speed and that I wanted the table to be able to turn 180 degrees in
> roughly 2 to 5 seconds. Noting the weight above (20 to 30 pounds) what
> would you recommend for motor size (other than bigger is better :)
>
> Thanks,
> Matt
>
>
>
>
>
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