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IndustryArena Forum > CNC Electronics > General CNC Machine Related Electronics > Question what determines the resolution of a Glass linear scales ?
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  1. #1
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    Question what determines the resolution of a Glass linear scales ?

    Hello there

    I am trying to figure out what determines the resolution of a Glass linear scales ?
    Is it the glass, the read head or both ???
    Is there anyway to tell by eye ??

    Thanks

  2. #2
    Community Moderator Jim Dawson's Avatar
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    re: Question what determines the resolution of a Glass linear scales ?

    Both. The read head has electronics the interoplates the pulses from the lines on the glass. There is no way to tell by eye. The easiest way is to connect the scale to your machine encoder input and see how many pulses it generates in 1 inch or 25mm of movement.
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
    Community Moderator Al_The_Man's Avatar
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    re: Question what determines the resolution of a Glass linear scales ?

    It is quite a unique process, the typical linear scale or rotary incremental encoder, which uses a similar method by using a read head that uses photo electric sensor, the moving head carries a small section of glass scale with the same resolution as the main scale, but with a slight tilted angle, this creates something called the Moiré effect, which essentially creates a shutter which essentially magnifies the minute resolution/increment of the scale in order for the read head to register the change in pattern.
    Otherwise the typical resolution of a scale such as say, a 2µm scale, would not be able to be read by a normal photo sensor.
    So the bottom line, as Jim said, it would be impossible to tell by eye.!
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

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