Surface Hits without Focus

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  • Surface Hits without Focus

    Good Afternoon:

    I'm constructing a plane out of 3 surface hits in on my optiv. I remember in class where we used focus on the first hit and I think leveled to it and then took 2 more hits without having to focus again. It made it a little faster.

    I was looking for the setting or menu to turn of focus but couldn't find it. Can someone help me out? Thanks.
    PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

  • #2
    I went over my course material, the lab states to take surface point and z translate to that, then create more points with much smaller range and duration. So I guess that is the answer to my question.
    PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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    • #3
      Usually when you shut it off once, it should follow suite. So in your Hit Target tab, select FOCUS and set it to OFF. Everything afterwards should follow OFF.

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      • #4
        I can't see where I can select off. some of the drop down boxes are already set to off but it still focuses.
        PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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        • #5
          I looked into it. It appears surface points will always need to focus. However, you can shut off focus on edge points, circles, etc.

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          • #6
            So for my programs I always Level and Translate Z to the relative surface but I was told best practice is to always focus. I have a lot of programs that perform hundreds of focuses for 1 run. Has anyone else heard of this practice? My Z referencing is usually taken with our white light sensor which is extremely accurate but it will still come down to best fit over the course of a distance. Measuring at 10x all the time so small features seem to like being focused on.

            I would love to cut out 2-4 seconds a feature and not Focus!! Ha!
            Anthony Fotion
            Quality/Reliability Engineer Technician
            Fujifilm Dimatix Inc.
            E-mail: afotion@fujifilm.com

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            • #7
              Maybe it was just reducing the duration after the first surface point. Maybe my pal Colin Simithraaratchy could shed some light on this. pun intend.
              PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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              • #8
                Turning focus to "off" will not give you a true plane. it's going to take a point where ever the camera resides. The book method you describe is a more correct method.
                Systems Integrator
                Hexagon Manufacturing Intelligence

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                • #9
                  Originally posted by Peter Fuller View Post
                  Turning focus to "off" will not give you a true plane. it's going to take a point where ever the camera resides.
                  +1 !
                  It's like using a "read point" instead of measuring it by a trigger...

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                  • #10
                    Thank you all for the help.
                    PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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                    • #11
                      Since my thread is taking about surface points, I;d thought I continue with it since we're still taking about surface points.

                      I'm having some problems taking a surface point during execution. I can test it fine during the but it's out of focus when I run the routine.

                      I made routine that will check the ID and OD of brass cylinders that have different diameters and heights. Most have the same height but a few of the mix are taller/shorter. Its starts off with a manual alignment with a touch probe on a corner fixture I had made. Then I move the origin to the inside corner. Then it goes to dcc mode with the vision probe. I'll bypass the manual alignments once my fixture is secure to the table. There is an operator input for the part number, then assignments alter the theos, target valves, and diameter of a circle based on the op input. The I use that circle (ID) as a temporary XY orgin. Then I need to check the thickness of the cylinder to adjust for focusing (this is the part I am new at). Then z orgin to that surface point and move on to the OD of the part which is also altered with assignments like the OD based of the original op input. The method worked great offline but not so much at the machine.

                      I was able to run a few different size parts but when I got to the 3rd part, it didn't focus on the surface hit even thought it was the same height as the other parts. I tried adjusting the range and duration but its not making that much of a difference.

                      Any help would be appreciated, thanks.
                      Last edited by acgarcia; 09-21-2017, 02:01 PM.
                      PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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                      • #12
                        Well what I did after all was turn Control to Auto, Find Surface to YES, and Surface Variance to Yes. It takes a little longer but the Optiv hit the surface point with no problems, even our test part that is thicker than the others came out well.
                        PCDMIS 2015, 4.5.4 SF CMM, Datapage+5.0

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                        • #13
                          Just make sure you have a wide enough range for the focus. I usually have problems if it's not painstakingly obvious that a material is out of focus, then in focus, then out of focus again.
                          You could have 1 quick but wide surface point, set it as your z-axis and then take another couple points with a much smaller focus range, if that helps

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                          • InspectorJester
                            InspectorJester commented
                            Editing a comment
                            Edit: When I say wide, I mean larger Z values
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