Need parts for Quality Measurement Systems 400 DRO
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  1. #1
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    Default Need parts for Quality Measurement Systems 400 DRO

    Anyone have a reader head laying around or know of some one that works on these old DROs? Its the part that slides on the glass scale.
    Mine is not reading and from what I can tell the LED is out.
    Yes I saw the article in The Home Shop Machinist on this DRO

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    Are you sure it is not a real light bulb?

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    Quote Originally Posted by hitandmiss View Post
    Are you sure it is not a real light bulb?
    Yes, The working reader puts out no visible light, checked it in a dark room while it was reading.

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    Contact DRO Pro previously he was a service tech for them.

  5. #5
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    LED might be hard to see, those are typically IR, only a tiny red spot can be seen in a dark room and if looking straight. Replacing LED might not be as straight forward as you think. That scale might have more than one of them and any misalignment between old and new LED or difference in intensity would cause scale not to work or work with degraded accuracy. Calibration and/or adjustments will be necessary which requires specialized tools and experience.

    Considering the age of that scale, very likely other parts are worn already out or very close to failure point. Replacing the entire scale would probably make more sense.


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