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Iterative alignment

Layoutguy
I have many yrs (25+) on cmms but new to PCDMIS. My question is about doing an iterative alignment using 3 tooling balls (TB's) on a gage.
Details are as follow.

The gage has a square base and is approx 500mm square. Car body coordinates are.....TB#1 (Lower left corner) X=331.98 , Y=566.99, Z=746.11 / TB#2 (Upper left corner) X=332.04, Y=808.24, Z=746.11 / TB#3 (Upper right corner) X=55.36, Y=808.24, Z=707.24 and the axis convention when completed as I look at the front of the gage (Same view described in TB location) is X+ right to left, Y+ front to back, Z+ is going down. I can measure the spheres, find the iterative alignment command in the construct an alignment menu and pick the appropriate TB's. I just don't know where to enter the coordinate of each TB for the correct offsets.
  • You don't enter any offsets. You don't just measure the tooling balls.

    1) Open AUTO FEATURES ~ SPHERE
    2) Enter the XYZ nominals and the correct vector (0,0,1, 0,1,0, 1,0,0, etc, just a major vector) and CREATE (do NOT measure) the spheres (all 3)
    3) Make the Iterative alignment using the 3 tooling balls
    4) Mark & Measure.

    Pcdmis uses tth THEO (nominal) values of the feature to generate the alignment, no offsets.
  • Thanks Matthew. We're doing this on a Romer arm so will the vectors still pertain?
  • Thanks Matthew. We're doing this on a Romer arm so will the vectors still pertain?

    I think so. I have always put in a "whole correct" vector for t-balls. If the 'common' number for all 3 balls is Z, then they have a "Z" vector (0,0,1 or 0,0,-1).
  • There is no "common" number for any of the balls. Also, when I try and type the coordinates into the auto feature it kicks me out of the box with every "digit" I type in.
  • I have many yrs (25+) on cmms but new to PCDMIS. My question is about doing an iterative alignment using 3 tooling balls (TB's) on a gage.
    Details are as follow.

    The gage has a square base and is approx 500mm square. Car body coordinates are.....TB#1 (Lower left corner) X=331.98 , Y=566.99, Z=746.11 / TB#2 (Upper left corner) X=332.04, Y=808.24, Z=746.11 / TB#3 (Upper right corner) X=55.36, Y=808.24, Z=707.24 and the axis convention when completed as I look at the front of the gage (Same view described in TB location) is X+ right to left, Y+ front to back, Z+ is going down. I can measure the spheres, find the iterative alignment command in the construct an alignment menu and pick the appropriate TB's. I just don't know where to enter the coordinate of each TB for the correct offsets.

    Is the gage square to grid? Does it have scribed lines at the base every 100mm? or perhaps some note indicating like "this surface is xxx.xx Z" Sometimes there are typos in the TB´s coordinates.
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