form and location

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  • form and location

    Let me confuse everyone. I have a cube and a radius (B) on top of the cube. Datum A is a vertical plane on the cube. The print calls out for form and location .004" from B to A. I level to Datum A as part of my iterative alignment. I measure rad B as a scan. What would be the correct method to dimension this feature. If I use form and location does PC-Dmis use x,y and z in the calculation. The function of Datum A is to locate the part in x and I know I will be asked to take the z error out of the calculation.
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    To the Brave and the Faithful nothing is impossible

  • #2
    Do you have a print or sketch we could see?
    <internet bumper sticker goes here>

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    • #3
      Originally posted by joe.sha View Post
      Let me confuse everyone. I have a cube and a radius (B) on top of the cube. Datum A is a vertical plane on the cube. The print calls out for form and location .004" from B to A. I level to Datum A as part of my iterative alignment. I measure rad B as a scan. What would be the correct method to dimension this feature. If I use form and location does PC-Dmis use x,y and z in the calculation. The function of Datum A is to locate the part in x and I know I will be asked to take the z error out of the calculation.
      Well, that scan WILL have to have cad nominals (ie generated from cad data) or you will not be able to ro form or form & location on it. However, if I understand you correctly, the peak/high-point/top of the radius is the locator, not the radius itself. If so, measuring the radius will NOT get you the correct B datum, you need a SINGLE high point from it. Not that this gets the answer, but......
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      Originally posted by AndersI
      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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