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Common Datums
A common datum refers to a datum identifier like A-B or A-AB-B. It has one or more hyphens that separate defined datum identifiers. PC-DMIS supports two types of common datums:
- Coaxial cylindrical surface. These may have different nominal sizes and/or size tolerances. You may measure them as either cylinder features or circle features.
- Offset parallel planes
I would:
(using legacy)
1) Measure CYL_A
2) Measure CON_B
3) create generic points at..
-start of CYL_A
-end of CYL_A
-start of CON_B
-end of CON_B
4) Construct a 3d line (LIN_AB) through the 4 points
5) Create a new alignment (ALI_AB)..
-level through LIN_AB
-make LIN_AB origin
6) While recalling ALI_AB, report the runout of the feature you want evaluated against your current alignment
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