shielded cable for stepers questions

[endgrainguy]

For a small (32 X 18 x 5 inch travel) router , if I use shielded cable for the limit and home switches, is sheilded cable necessary for the steppers in all cases, or only if cable is to be contained in cable carrier along with limit (and maybe 12 amp router too) wires?

Here's a rap that says it isn't, but I'm not capable of addressing his argument, and it seems lke most recommendations are to use shielded.

"For stepper motor connection, you DO NOT need shielded wire because it is almost impossible for normal stray EMFs to induce an off balance voltage and off balance current that will disrupt a step signal in a pack of six spiral wound wires driveing a stepper motor. A two amp motor cannot even be moved by a half amp signal and to induce a directional 1/2 amp signal in a spiral wire set is virtually impossable. This is unshielded wire. Unshielded wire is just the ticket for connecting your six wire motors. It is one third the price of shielded, and works perfectly." FROM
http://cgi.ebay.com/CNC-Stepper-Moto...QQcmdZViewItem

Or not necessary at all? And if one does use shielded cable, can anyone recommend supplier for it, and is it possible (and if so how) to have quick disconnects that preserve the continuity of the shield and ground? Thanks!

[Monte]

One thing to consider is that if your motors are wired bipolar you only need 4 wire going from the driver to the motor as some wires at the motor get jumpered together.

I forget how unipolars are wired, but I think you need either 3 or 5 wires.

Monte