On 12 Feb 2006 07:56:53 -0800, "mechanized_robot"
wrote:

Can anyone point me to a web resource that lays out the basics of DC
motor controlling or possibly put down the bullet points of same?

First you need to understand the motors themselves.

http://www.electricmotors.machinedesign.com/

There is a ton of motor control stuff at
http://www.microchip.com/stellent/st...83&pageId=6 4

This is primarily aimed at use of Microcontrollers for motor control,
but theres some good basic stuff, like drive cctry, there as well.

I would like to convert my drill press to DC and after reviewing the
myriad of options on ePay, decided I need experienced help.

I would like to buy surplus/used parts if at all possible and need some
guildlines as to what to look for such as DC field voltage of motor,
typical controller types used, pitfalls, etc.

Just look for motors that have the speed, torque and/or power you
think you need. Matters of field voltage (if not PM motors) can be
dealt with. Understand that DC motors do have a maximum torque
limited by max current. Reducing speed with pulleys or gears also
increases delivered torque, but if speed control is done electrically
then the motor must deliver the full load torque even at reduced.
speeds.

Best speed control is obtained with tachometer feedback. Some motors
have built-in tachs. An external tach or encoder can also be used.

If anyone could comment on what they did when they converted their
machine(s) it would be greatly appreciated.