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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??​
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  • No way would I ever use 3 points for a plane (even on a 1,2,3 Block) 4 or 5 minimum. The holes are probably not very round (form), if you want to use the holes, get them jig ground or machined on your best tool.
    If the CMM does not match the plate readings the program or CMM needs adjusting, most likely the PROGRAM!!
  • Glad you got the time to take that many points. I do not. I have to justify to the CEO why a part runs over 10 mins on parts with 20 plus holes. CMM means chips are not flying and the company is not making money. I do agree with the program that's my question what am I missing??
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