You can run steppers at 20 times their rated voltage, and with such a low rating, you should run as high a voltage as you can. But, like Eric says, are they high current motors? If so, you'll probably need to use Gecko's which doesn't seem like the route you're taking.
Gerry
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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