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Using focus position as a Z location

afotion
Hey all,

I have a simple one for you which may have some complex answers. As a rule of thumb I have always avoided using any kind of focus points/positions to do any kind of Z location/height measurements.

Do any of you use focus points with high confidence? I have had decent experiences and sometimes I have had complete failures with it. Is it safe to assume it comes down to material and lighting and the application? I found that when trying to perform this on a very centralized locations within your FOV it then becomes very difficult to make repeatable.

I would love to hear your thoughts.

Thanks!
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  • Hey Jef,

    Can you elaborate just a little bit? Are you saying your range of focus is 10µm? or are you saying or focus position range is 10µm?

    Also, are you saying that if the lighting settings change then the position itself with change but then if you use those settings it will be repeatable within µm of that position?

    I am asking because we would want to use TTP to set a reference plane and then use Vision to find a groove that comes to a perfect valley. It is actual a cross weave type pattern like you would see for a grip on a tool, we want the depth of it. This would normally be done using our Mitutoyo Profilometer but a supplier is insisting on this method since it saves them time and they are convinced it is repeatable and gives accurate readings.
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  • Hey Jef,

    Can you elaborate just a little bit? Are you saying your range of focus is 10µm? or are you saying or focus position range is 10µm?

    Also, are you saying that if the lighting settings change then the position itself with change but then if you use those settings it will be repeatable within µm of that position?

    I am asking because we would want to use TTP to set a reference plane and then use Vision to find a groove that comes to a perfect valley. It is actual a cross weave type pattern like you would see for a grip on a tool, we want the depth of it. This would normally be done using our Mitutoyo Profilometer but a supplier is insisting on this method since it saves them time and they are convinced it is repeatable and gives accurate readings.
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