Viper, where did you get the 15a from? The Xylotes (and Geckos) only need 2/3 of the rating of a SINGLE phase. So my 6.5a is still the right answer, for 4 axis with the Xylotex Bipolar board. Assuming the Unipolar drive is similar, 4 motors at 3a/phase x 2/3 = 9 amps .
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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