I recently finished my 4th Techno retrofit. It was a stepper system about 44/33. Interestingly it was tougher than the servo retrofits I did. The reson that it was more difficult was that the motors had amphenol connectors on them running the motor power leads, the home/limit switch and in the case of the Z axis the brake power leads. The issue that I had was that several of the axis were causing Mach3 to reset becuase I was picking up electrical noise from the motor power leads. I solved that problem by installing a low pass filter on each of the input leads from the siwithces.
The other issue was how to cycle the brake on the Z axis off . That was fairly simple fix by setting up a charge pump to a relay that when Mach3 resets the brake would come on even if the motor engage switch was engaged. If you disengae the motor outputs then the brake comes on again.
If you engage the outputs to the motor and reset Mach3 then the brake is released again. Works slick .
Dan Mauch
www.camtronics-cnc.com
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assembled and tested systems
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dmauch@camtronics-cnc.com