I am trying to write a CMM report reflecting the information on the customer's drawing. The issue is I cannot get XactMeasure to report the GD&T displaying the datums with dashes between them, as shown in this drawing. Can anybody help please.GDT DATUM QUERY.jpg
Reporting with dashes between datums
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Hi gibsonridge.
Thanks for the reply.
There are three datums defined on the drawing. A, B and C.
A is the master plane
B is the centre of the counterbore
C is the centre of the widest slot in Y
My issue is, that when creating my report, how do I call up | A | B-C | B | in PC Dmis as datums for reporting the true pos, form and location. PC Dmis does not give me the option
Thanks in advance.
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You can create a compound datum; first create the DRF with the first datum then create; then insert a dash followed by the second datum.
Code:FCFLOC1 =POSITION : CIR_C FEATCTRLFRAME/SHOWNOMS=NO,SHOWPARAMS=NO,SHOWEXPANDED=NO, SIZE TOLERANCES/1,DIAMETER,0.205,0.004,0.003 PRIMARY DIMENSION/POSITION,DIAMETER,0.084,MMC,D,A,[COLOR=#e74c3c]B-E[/COLOR] NOTE/FCFLOC1 FEATURES/CIR_C,,
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Thanks all
Hi sealevel
I have constructed the generic circle where my slot midplane is. Called the generic circle datum C.
When I come to report the true position of the end face (just started there as an example), I can not type in the B-C datum callout in Xact.
I can only use my A and B datums, the go into the program (the edit window) and type over the B datum with B-C, then add a B callout later.
I then get an error as shown in the image
DRF Error.jpg
So, now my report reflects the customer drawing, but it reports that the end face is a country mile out. I am programming offline with nominal CAD.
Report Error.jpg
Measuring the end face in position only, I get the correct result
DIM LOC1= LOCATION OF PLANE RGHT_END UNITS=MM ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
X 275.500 0.001 0.001 275.500 0.000 0.000 ----#----
END OF DIMENSION LOC1
Sorry to be a pain, but any help would be greatly appreciated.
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The FCF is redundant. Normally a dashed datum should indicate things that are coaxial where the two datums are non continuous features that may or may not be the same size.
In this case, |A|B|C| accomplishes the same thing the horror your FCF thinks it does - A controls one axis and sets the origin, B alone creates the origin of the other two axis, leaving nothing but the final rotation, controlled by C.
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Exactly. This is a goofy drawing all-around. The longer I look at it, the worse it gets.
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Just now reading this. I was looking at the drawing above and was saying to myself, there is NOT 1 callout that says A|B|C, So I'm with RandomJerk here.
A=PLANE, LEVEL and ORIGIN Z
B-C = (CONSTRUCTED) LINE (from B to C) ROTATION ONLY
B=CYLINDER OR CIRCLE, ORIGIN X and Y
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