True Position Question

[ag162]

Good Morning Everyone,
I have a question about a TP callout. The part that is being measured has a cylectrical area. The control frame has tp and two levels of dia tol. The top has [dia (symbol) .020"][A][BM][C], then under that one, there is [dia (symbol) .015"][B], all of these have the TP symbol in a main box the is beside both. I'm unable to scan the print. or I would have it on here. Now, how do I approach this?
Not to mention, the faro that I'm supposed to be using is still in the box, class for the cam2 software is not until 07/06/06, and they (we) are using scales and squares to measure everything.
Yeah,,,,this is the "job" that I accepted, the parts are welded components that are made of armor plates for a vehicle. No climate controlled lab,,,,,,no private office,,,,,,, At least the money is ok,,,,,,,........I can't check back here until I get off of work. Thanks in advance.

A.Gore

[slinky1561]

The first True Position is relative to the Datums:
A (Primary Datum)
B (Secondary Datum at Max Material Condition (MMC)) Probably a Hole/Bore.
C (Tertiary Datum)

The Second True Position is relative to DATUM B ONLY.
This is probably because the bore in question and Datum B are in line.
The 0.015 True position is to check that the bores are in line.

Hope this helps