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GEOTOL help

management had me run a test. I taped a 2,4,6 block to the table. took the top plane, x+ and y- and created my alignment. I then called them datum a top b x and c y. I measured 2 holes on each side and did a position in geotol. I used the same measured data in legacy and got a .010 difference. How can this be?

What management is saying is the position formula. 2 x (dx^2 + dy^2)^1/2 when you figure it manually using the measured values matches legacy perfectly but it is not matching in GEOTOL.

I understand this is rough and dirty test but I can not explain why parts we measure good with second methods and legacy are good. GEOTOL (which our customer uses and requires) is failing the part. I have asked Hexagon this question and keep being told that GEOTOL is correct to the standard. Which is great but the standard use the 2 x (dx^2 + dy^2)^1/2 formula and is passing this but failing in GEOTOL.

I am not bashing PCD Hexagon or anything but I can not explain it to management.

What am I missing??​
Parents
  • You are not evaluating GeoTol in the same DRF as Legacy. Your DCC alignment is BAC, and your GeoTol alignment is ABC. The perpendicularity between A and B could be an issue here.
  • But what does the alignment have to do with it. The DRF is correct in both. Is it calculating the alignment and the DRF? The FCF calls for ABC and the DRF is ABC not sure why the alignment matters once it has established the part location.

    If the DRF and the alignment are both used in the calculation that explains why my stuff is off but I do not understand the reason why it would use both. If you set you datum a plane as datum a it should not matter where your alignment is as datum a is datum a.
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  • But what does the alignment have to do with it. The DRF is correct in both. Is it calculating the alignment and the DRF? The FCF calls for ABC and the DRF is ABC not sure why the alignment matters once it has established the part location.

    If the DRF and the alignment are both used in the calculation that explains why my stuff is off but I do not understand the reason why it would use both. If you set you datum a plane as datum a it should not matter where your alignment is as datum a is datum a.
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