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Measuring step height

*...*
I have a Visio 300
PC-DMIS 4.3
I set up 2 gage blocks side by side 1 .600" and 1 .550"
I measured a the top of the .600" block with an auto focus point max zoom
set the (Z) origin to that point
measured the same point 10 times and got a range of .00222"
did the same on the .550" block and got a range of .00247"
I don't understand I feel this should be more accurate than this.
Does anyone have any settings suggestions that I can try?
Thanks
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  • I have a Visio 300
    PC-DMIS 4.3
    I set up 2 gage blocks side by side 1 .600" and 1 .550"
    I measured a the top of the .600" block with an auto focus point max zoom
    set the (Z) origin to that point
    measured the same point 10 times and got a range of .00222"
    did the same on the .550" block and got a range of .00247"
    I don't understand I feel this should be more accurate than this.
    Does anyone have any settings suggestions that I can try?
    Thanks

    Welcome to vision... on the better systems, I would expect to see around .0002"-.0005" @ ~12X optical.

    This could be software or hardware.
    Can you reduce your focus target size to it's smallest?
    Adjust the speed of the focus - slower = better.
    Adjust the "backoff" and "focus through" to the smallest settings. This is the total evaluation range of Z for each focus.
    Try only using coaxial illumination if possible.
    You need a target to focus on, something with contrast. With a gage block, a finger print works nice.
Reply
  • I have a Visio 300
    PC-DMIS 4.3
    I set up 2 gage blocks side by side 1 .600" and 1 .550"
    I measured a the top of the .600" block with an auto focus point max zoom
    set the (Z) origin to that point
    measured the same point 10 times and got a range of .00222"
    did the same on the .550" block and got a range of .00247"
    I don't understand I feel this should be more accurate than this.
    Does anyone have any settings suggestions that I can try?
    Thanks

    Welcome to vision... on the better systems, I would expect to see around .0002"-.0005" @ ~12X optical.

    This could be software or hardware.
    Can you reduce your focus target size to it's smallest?
    Adjust the speed of the focus - slower = better.
    Adjust the "backoff" and "focus through" to the smallest settings. This is the total evaluation range of Z for each focus.
    Try only using coaxial illumination if possible.
    You need a target to focus on, something with contrast. With a gage block, a finger print works nice.
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