Quote Originally Posted by typhoon_driver
George francis used to make a controller that did just this. As far as I know took a feedback and was able to turn a motor into a precise servo. Although these are like ducks teeth to find these days.

As for a current product that can do the same? I'm not aware of such a thing.
Seem to reacall that the george francis ones were simply fitted with limit switch connections.

The team delta relays http://www.servocity.com/html/electroni ... _dual.html are also fitted with limit switches but the actuator we have in Cylon has these integral anyway so aren't necessary. Control of actuator position is simply apply power to move, take power off to stop.

Most of the Roboteqs are capable of closed loop position mode http://www.roboteq.com/technology/robot ... motormodes as are many other controllers. Never used them but you just need to look at the instruction manuals.

In reality using the relay just gives you one big servo. I had thought about using those for an axes (Put a cam on the shaft to operate limit switches and you're away

Andy