I've been chasing a gremlin in the new DRO setup this afternoon. I had calibrated the DRO to the thickness of the piece of wood I had been running through and each time I ran the wood through it was measuring within a few thousands of what the DRO was showing. I planed the board down to .625" and turned the machine off. I then noticed that the display was reading 1.001".
I re-calibrated the DRO to what the wood was measuring, adjusted and took a pass, it was reading fine. As soon as I shut the planer off, the DRO jumped back to reading about .905".
It was then I realized I had mounted the DRO pretty close to the magnetic switch. And my assumption was that I was getting interference when the switch shut off.
I did some googling and found this is a common problem with these DRO's, as the cabling is not shielded.
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I decided to test this by removing the zip ties and pulling the majority of the cable outside the enclosure. After several times of turning the machine on/off, it only happened when I allowed the bundle of cable to get too close to the machines switch.
I had a drawer full of clip-on ferrite cores, so I looped the usb cable at each end and added one to one by the reader, and one by the display. I then tucked the extra cable up away from the switch, and so far it seems to be working.
My other issue was the blades weren't all set at the same height out of the head. I adjusted them to be all parallel in the cutter head, but it looks like it is cutting about .010" deeper on the left side, so I'll take a look at adjusting the bed to the cutter. If that isn't possible I may need to adjust the blades on that side of the head a bit.