X axis problem

[joethepro]

I'm looking for the simplest way to build a gantry that travels back and forth on the X axis only without it being hooked up to a computer. It will be belt driven and controlled by an 18v dc drill motor.

I was thinking about using an "on-off-on" switch at each end of the gantry slide to reverse the direction of the gantry, but I think the motor won't last long if I do it that way. I need something to slow the motor at each end before it reverses direction.

I've thought about Hall sensor's, 555 timers, limit switches etc., but they seem complicated being that I don't know much about hooking them up. Just want something simple.

Any idea's?

[JoshMac]

is it a fixed length linear movement, or does it need to be adjustable?
one idea is to change the way you are doing it a little, using some linear bearings (pretty cheap if you look around) on a axis.

I have attached a google sketchup drawing of what im talking about.
contact me with your email if you want me to send the sketup file.

I have made a couple of things using this method in the past for friends.

Good luck