Open Source Digital Readout

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Re: the concrete machinery, I just saw this today

For the DRO, I found lots of info by googling: diy dro

There is a very good quality open-source DRO made by Shumatech, but see comments on discussion page.

The quickest, cheapest way is to adapt a long off-the-shelf digital caliper to each axis. It should be possible to hack the circuit for feedback to a control system for CNC.

Eventually I would photographically replicate a master optical glass scale into many low cost copies and make the optical readout heads ideas- (Dead Link) (Dead Link)

While it will never match the precision of a glass scale or interferometer, don't forget the encoded Trav-a-dial concept