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  1. #1
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

    Default circular glass scales - worth keeping?

    Gday .
    I salvaged an old, early electronic theodolite from a dumpster death at work. They haven't been used for years and this one had damaged optics.
    I basically grabbed it to pull it apart to see what was inside.
    I'm not an electronics person so have no idea.
    It has 2 circular glass scales with some sort of reader attached.
    I have all the electronics but I didn't test anything before disassembly. It was probably still working.
    These things are pretty accurate in measuring angles and I was wondering if they would be of use to someone as encoders?
    If anyone wants them they can have them if they pay for the postage.
    The one on the right is for the horizontal axis and the one on the left for the vertical axis. Horizontal is designed to read complete 360deg.
    Not shown in the pics are the rest of the boards.
    peter
    Attached Images Attached Images

  2. #2
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Hi, could be interested in these, also any other of the electronic parts you may have for the theodolite. I have a damaged theodolite here with bad electronics but the mechanicals are good. Do you recall the model of this theodolite?

    Thanks

  3. #3
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    5,080

    Default

    They look like absolute position rotary encoders. With 16 wires going to the photocells, I'd hazard a guess they might be 12 bits. Might even be encoded as direct reading in degrees.

    See if you can find a part number or some sort of identification.

  4. #4
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

    Default

    Sokkia DT4 is the theodolite. I'll have a look to see if there are any part numbers. I have the complete electronics part. Had to cut a cuople of wires to get it art but they are easily rejoined. However I didn't take note of what ribbon cable went where as I wasn't really thinking about the possibility of potential reuse at that point.
    peter

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