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  1. PaulL

    Shop DRO taking away my fun?

    And I should add: I'm never going to do it again! Which is how I feel about running my mill without the DRO.
  2. PaulL

    Shop DRO taking away my fun?

    Though that's exactly what a fellow has to do at least once. I love my little self-made timber trame hut. A couple of summers in the woods building it that I wouldn't trade for all the dimensioned lumber in the world.
  3. PaulL

    DRO Heck.

    Yeah, I could see that helping. But now that I'm working, I'm loathe to touch it again... Thanks for the offer, however. The other thing I need to check is if the shielding on the cable is correctly grounded. The cables are almost certainly hand-assembled, and it might be easy to "miss" the...
  4. PaulL

    DRO Heck.

    It sends the usual A and B edges, and NotA and NotB, each on a wire. But I suspect neither of the DRO heads I have (SINO and TouhDRO) do anything clever with the negated signals. What I really need to do is find a decent scoping point on the connections, and inspect the noise from the AC, but...
  5. PaulL

    DRO Heck.

    Ok, I think I can now say I have it licked. There were three main factors: 1) DTI paralax/sine error. Thanks all for pointing it out. Moved to a plunger that I could align nice and square, and found a 15% or so error. 2) The edge of my cross-slide carriage has a couple of thou of slope. When...
  6. PaulL

    DRO Heck.

    Got a few things sorted with a couple of suggestions from @Dabbler, some of which I see above. First, sine error on the DTI. Switched to a plunger and the error is less. Second, I keep forgetting how simple the protocol is on these heads - there's no error correction or even validation. And I...
  7. PaulL

    DRO Heck.

    Ok, made a short video. In it you can see me bring the 123 block up to the DTI, zero the DRO and advance 10 thou while showing only 4.3 thou of movement. I then I advance the distance of the block, coming in at zero four thou early. It means it's not a messed up radius/diameter thing, and...
  8. PaulL

    DRO Heck.

    I set the DTI to zero and the DRO to zero on the 2" side of a 123 block. I remove the block, travel to the edge it was pressed against, and get 2" on the DRO just where the DTI hits zero. I'll take a short video.
  9. PaulL

    DRO Heck.

    Yes. But reads 2" over the 2" span, down to one thou. I'll be back in the shop shortly and will photograph the setup carefully
  10. PaulL

    DRO Heck.

    Spent some more time with the scales. It's not a TouchDRO problem, it reproduces exactly the same on my old SINO unit. It's the strangest hysteresis: I set a DTI to measure travel of my cross slide and use a 123 block to measure off a 2 inch increment. As I move away from zero on the DTI, I...
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