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Romer Arm Zero point

Clementine
I have not used our Romer ARM for some time and I am struggling just to start the alignment.
I noticed when I created the plane for the Z axis feature, the software is not compensating the stylus ball. 15mms. The zero point is not Zero when I tough the stylus to the part after aligning. Plus when I make a point on the plane on Z axis I am getting .26 reading instead of "0".
What am I doing wrong?
  • I have not used our Romer ARM for some time and I am struggling just to start the alignment.
    I noticed when I created the plane for the Z axis feature, the software is not compensating the stylus ball. 15mms. The zero point is not Zero when I tough the stylus to the part after aligning. Plus when I make a point on the plane on Z axis I am getting .26 reading instead of "0".
    What am I doing wrong?

    ALL data on CMM's with PCDMIS comes from the center of the ball of the probe. If all you are doing is resting the probe on the plane, the display will show you the radius value of the probe. If you program a point on that plane, then go and take the touch, it SHOULD comp for the radius.
  • Plus when I make a point on the plane on Z axis I am getting .26 reading instead of "0".


    To expand to Matthew's comment: when you are creating a Measured Feature of type Point, the probe compensation is dependent on your probehead angle.

    Meaning that if you are laying the side of the ball on the top surface, it might be comping in X+/X-/Y+/Y- instead of properly down in Z. This could explain why you're seeing points with a Z-height of about half the 15mm ball.
  • Thank you for your reply Colin, So I need to take points with the probe ball in the same direction of the plane vertex and not using the side of the ball probe to take points. This can be hard to do if the plane is too close the the table. Looks like I need to move my part to get good points for that plane.

    Thanks again: Slight smile
  • To expand to Matthew's comment: when you are creating a Measured Feature of type Point, the probe compensation is dependent on your probehead angle.

    Meaning that if you are laying the side of the ball on the top surface, it might be comping in X+/X-/Y+/Y- instead of properly down in Z. This could explain why you're seeing points with a Z-height of about half the 15mm ball.

    Probe compensation for a Measured Feature of type PLANE takes place differently. It is NOT dependent on the probehead angle. Basically, you take a bunch of hits, PCDMIS looks at the ballcenter hit pattern, realizes it is a plane, and comps accordingly. Since it's a 3D feature, neither the probehead angle nor the workplane apply.

    Where did you do your Romer training? Take a look at Lab 5 from your workbook.
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