hexagon logo

Profile vs T-value vs Colormap

Hi,

Another day, another question Upside down

Today i had to check a profile callout (0.5 max - form only), but i find the results a bit strange, maybe i'm missing something but here is what i got :

- Profile is reporting OOT while point cloud colormap shows pretty good values (tolerance set to +/-0.25) while T-value shows something even different :

 

Where is the truth here ?

I would have think the values shown on point cloud are equal to the T-value no ?

For example here the point 88 is reporting 0.140 and T-value is 0.197, point 127 is reporting 0.152 and T-value is 0.068...

Also, if i look at all the values shown, the min is -0.034 and max is 0.155 so i would assume the profile result would be 0.189.

Any idea ?

Parents
  • All points are here, and graphical analysis looks like this :

    External points looks all OOT.

    Here is the callout, so it's bilateral, and i'm pretty sure the engineer just want the big radius to be well shaped:

  • In my opinion, that callout is ambiguous.  If it were me, I would ether bug controlling design authority for clarification, or just move forward with interpreting it at face value: exclusively interpret it to apply to the radius, which is continuous, to become a donut.  This is inherently controlled "all around", BUT clearly defined as a bilateral zone, ±0.25mm from the radius nominal.

    So if it were me, I would do the following:
    1: remove analysis of the base plane inside the cup.
    2: prudently exclude blend radii at top of cup.
    3: measure it as individual radii, then construct a scan set of all the radii combined, bestfit align to the combined radii set, then produce one profile of a surface to that set.

Reply
  • In my opinion, that callout is ambiguous.  If it were me, I would ether bug controlling design authority for clarification, or just move forward with interpreting it at face value: exclusively interpret it to apply to the radius, which is continuous, to become a donut.  This is inherently controlled "all around", BUT clearly defined as a bilateral zone, ±0.25mm from the radius nominal.

    So if it were me, I would do the following:
    1: remove analysis of the base plane inside the cup.
    2: prudently exclude blend radii at top of cup.
    3: measure it as individual radii, then construct a scan set of all the radii combined, bestfit align to the combined radii set, then produce one profile of a surface to that set.

Children