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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
  • Are your datums using three planes? How many points per plane, and more importantly, is your hole measurement set to max_insc(assuming you are measuring a hole), cuz your geo_tol will do that automatically changing your center point. Also if you're messing around with going back and forth too much, it can mess up your nominal, make sure they are the same on both legacy and geo tol. I would run it from scratch anytime you make any changes.
  • if the form of your hole you are measuring is out of round, it will make a lot of difference on your center point. Can you report out the form of the circle you are measuring? or are you saying your actuals are the same but your tps are different? Need more info, pic of your report perhaps?
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