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I've got a P III running my router, it cost me nothing.
If/when it dies, I'll get another one for nothing (or maybe a sign job)

Why bother?

I've tried the Oatley drivers, just be aware they are full step only.
They work as promised but you hafta keep the step rate WAY down.
If you intend serious work, go for a half-step drive at the...

failing all else, try your nearest airport.
light aircraft or sailplane/glider use exremely flexible high-tensile wire
if you don't want to go there, try "picture wire" from picture framers'...

I've used the Oatley drivers.
They are full-step bipolar only. Don't expect much in the way of rapids.
Crank up the current, your steppers should be running hot. Just about too hot to keep your...

KISS!
use a conveyor

Woodnack, try outlineart. Pretty basic interface, but works for me. You can download from
http://www.qwerks.com/allsoftware/O/3_software.html
$20 to register
Rgds, Lin

Hi, I'm a noob here so I'll keep it brief.
Re current sensing, you can try taking a turn or 3 of motor lead round a magnetic core (just a steel bolt or stud) and sensing the field with a hall effect...