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Probably about $40 in parts (the scope example was to simplify explaining hi-impedence). In addition to backlash, it could also be used for more accurate limit switches, and home positioning. 1...

What they do is provide pulses which provides speed and direction. They are currently used for feedback into the servo motor controller, and will trigger an e-stop on position misalignment. That...

Just before joining this forum, I did the same, but used two 3/4 aluminum square tubing bolted together as I was worried about twisting. Now looking to extend the YZ axis, any picts?

All the manuals I've read show using tools to read the backlash amount. I've a 7ish year old dsls micromill, with rotary encoders. Is there a reason I can't split the signals off to a separate reader...