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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!
Parents
  • There is one family of parts we used Ring Light to focus in on a surface that is 0.1-0.3mm wide. But to make sure that the point is focused on the center of that surface, it requires variables based on other features to make sure that the vision probe goes into the right spot to pick up the depth in Z. It can be done. To increase your confidence in doing Z depth with vision, run a Gage R&R.
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  • There is one family of parts we used Ring Light to focus in on a surface that is 0.1-0.3mm wide. But to make sure that the point is focused on the center of that surface, it requires variables based on other features to make sure that the vision probe goes into the right spot to pick up the depth in Z. It can be done. To increase your confidence in doing Z depth with vision, run a Gage R&R.
Children
  • in reply to bfire85
    Thanks B,

    We are actually doing a Gage R&R with a supplier and seeing if we can correlate for that exact reason. I was very interested in the experience you guys have with this. Although I have done it myself as well we have always tried to just revert back to our WLS or TTP. I have also thought about making the machine take multiple points in the same exact location and report all of the points over and over again to check repeatability. I also wanted to compare the measurements between all 3 of my probes.
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