Played with the mill some. The DRO headunit was damaged in the move and opted to use the existing glass scales and TouchDRO to help my lack of machinist skills. Had to identify the pinouts on the scale outputs to properly connect them - 5 wires, (gnd, +5v, A, B, Z - A/B are the signal and Z is a reference signal). That took a bit of doing, but wasn't unmanageable. Then made the dongles that go from the DRO brain to the scale connections.
Essentially matching the board pin out with the DB9 connector from the scale. Through this process learned there is no "standard" for either color or pinout on these scales, so a bit of caution is needed to avoid sending/shorting the scale reader electronics.
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Here's the assembled DRO box.
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Then to work on the display. TouchDRO uses a Bluetooth signal and an app on an android tablet. Bought a Kindle Fire HD10 (a bit overkill but for $89, it'll work) had to backdoor/sideload Google play to get the touchdro app, but that was about 15 min of reading and doing.
Decided to use a mix of 67d.com and Amazhina mounting hardware. I love the 67d stuff, but their tablet mount designed for off roading on a a non-moving mill was overkill and way over budget, thus queue the China crap.
Mounting it was painless, getting it configured was pretty easy as well.
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If only the rain would stop so work on the big shop could continue. The chaos in my 2 car garage is absurd.