Need some help with expression building and output value.

[Jim Poehler]

I seldom use expressions but I have a need to display the distance between concentric circles as the customer print has this dimensioned as a distance of .005-.006. This is what I have for now but I am not sure how to use this in a dimension call out. Any ideas?

ASSIGN/V1=CIR4.RADIUS-CIR1.RADIUS

[bfire85]

Create a generic feature and enter the variable into whatever axis you choose and dimension the generic feature.

F2         =GENERIC/POINT,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<0.005,0,0>,$
            MEAS/XYZ,<V1,0,0>,$
            NOM/IJK,<0,0,1>,$
            MEAS/IJK,<0,0,1>

[Jim Poehler]

Worked like a charm. Thanks much..

[kingsld1]

Use a generic feature and populate one of the Measured values with your variable.

F1 =GENERIC/POINT,DEPENDENT,CARTESIAN,$
NOM/XYZ,<0,0,0>,$
MEAS/XYZ,<V1,0,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>

Then report location as normal.

I'm probably misunderstanding what you are intending to do, but don't you need to account for differences in circle locations in your expression?

[Jim Poehler]

This is a cylindrical piece with segments varying in diametrical size along its length. They all share a common axis so circle to circle locations will not work. Instead of dimensioning like a "normal" print with two separate diameter call outs, they chose to dimension a distance from one OD to the adjacent one as being a distance of .004 to .006. That is why I needed to use an approach like this. Worked like a charm. Thanks much.

[Ego Murphy]

This is a cylindrical piece with segments varying in diametrical size along its length. They all share a common axis so circle to circle locations will not work. Instead of dimensioning like a "normal" print with two separate diameter call outs, they chose to dimension a distance from one OD to the adjacent one as being a distance of .004 to .006. That is why I needed to use an approach like this. Worked like a charm. Thanks much.

Many ways to skin this kitten, some of which are "ordinary" programming without dwelving into all that high-falutin' fancy stuff (which I understand you are eager to get moar skillz with).

Another would be to Construct a line, choose Alignment, create, close out, then toggle the WORKPLANE field to an axis that runs perp to whatever axis the diameters share.
This makes an actual line feature running along your alignment's axis.
This can easily be used to Construct Pierce Points on each OD, and then simply dimension the distance between the points.

[Jim Poehler]

Good to know this approach as well. Tried it out and will remember it (or try to). Always many ways to program in PC-DMIS

[vpt.se]

Bad way of dimensioning.

Just my 0.2 SEK.

[JEFMAN]

Maybe a radial runnout ?

[bfire85]

Or individual hit differences, finding the max and min thickness variations.

[Douglas]

how is this expression not yet globally standardized as just my .00025 BTC worth