Target 3 is pressed fit carbide round that will be grind off until it reads zero relative to simulated datum line "zero" and become your target to for zeroing the dial indicator tip. The tangent line between the two produces the simulated datum line "zero" and need to be pararrel to DTM A(.002 max). Target 1 & 2 are gage pin pressed fit to the base plate. It's hard to explain this, so I attached the picture. This simulated datum line becomes a "zero" dimension and dial indicator read the reading at the inspected point. Depending on which datum (primary, secondary, or tertiary) you are setting up, this rule will guide you as to how many points, lines or areas are required to establish a Datum Reference Frame.I have an inspection gage that measure height position of a point with relative to a simulated datum line from 2 other points. It is important to remember the 3-2-1 Rule with Datum Targets. The real world set up will need to mimic these requirements. The drawing will specify the requirements for locations, quantities, sizes, and orientations of the datum targets.
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