First time using B-C as a tertiary datum

Had just a quick question, it seems it may be as elementary to most on this forum about a B-C Tert. Datum
I need to know for sure if I did this correctly.
I have a flat part with datum A as the plane which I leveled and origin in Z
I have a center diameter that I origin in my X & Y
I am checking Datum C to Datum A&B
Then using Dat. A and Dat.B and then an axis Datum of B-C( which I constructed a two dimensional best fit line to To check true position of other holes located around the parts
I have constructed both the alignment (red x,y,z,) and DRF (yellow x,y,z) in display window. (they match perfectly)
I figured everyone asks for code so I will post some below, :

A1-DCC =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,DAT-A-DCC
ALIGNMENT/TRANS,ZAXIS,DAT-A-DCC
ALIGNMENT/TRANS,XAXIS,DAT-B-DCC
ALIGNMENT/TRANS,YAXIS,DAT-B,DCC
ALIGNMENT/END
DATDEF/FEATURE=DAT-A-DCC
DATDEF/FEATURE=DAT-B-DCC
DATDEF/FEATURE=DAT-C-DCC

HERE IS THE B-C ALIGNMENT

A-2 ALIGNMENT/START,RECALL:A1-DCC,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,DAT-A-DCC
ALIGNMENT/TRANS,ZAXIS,DAT-A-DCC
ALIGNMENT/TRANS,XAXIS,DAT-B-DCC
ALIGNMENT/TRANS,YAXIS,DAT-B-DCC
ALIGNMENT/ROTATE,YPLUS,TO,LIN1,ABOUTZPLUS
ALIGNMENT/END
DATDEF/FEATURE=LIN1,BC

VinniUSMC over 10 years ago

What is the purpose of the tertiary being B-C? I can't think of how that would differ from an A|B|C structure. Are B and C both holes that are perpendicular to A?
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NUGUY over 10 years ago

Assuming datum -A- is top of part (plane). I have no idea what any of the other datums are. A hole? An edge? A line constructed from 2 holes? I guess for me, I employ a simple level-rotate-origin method (in that order).
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dph51 over 10 years ago

Shane-o, a word of caution when programming PCDMIS.

you should get out of the habit of using the "dash" or "minus sign". PCDMIS has a nasty habit of reading that as a math operand.

The only RECOMMENDED characters to use (as specified by PCDMIS) are numeral (0-9) alpha(a-z) and the underscore (_).
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Shane-o over 10 years ago

Datum b and c are thru holes on the same centreline. B is in the completely centred to the part ( in the middle) and datum c is 1.600 ( basic dimensioned) above. Thank you I will stop using this symbol- from now on. The new new b- c tertiary datum is called out to check separate holes for tru position. I figured using a line and rotating it for my X using datum b and c is what the engineers wanted. Both b and c are perpendicular to datum a . Figured I'd answer everyone at one time.
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Shane-o over 10 years ago

Does anyone know if clicking the " advanced " button on here allows me to upload photos of the print?
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dph51 over 10 years ago

Does anyone know if clicking the " advanced " button on here allows me to upload photos of the print?

under advanced...........

Attachments
Manage Attachments:

Valid file extensions: bmp doc gif jpe jpeg jpg pdf png psd txt zip
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vpt.se over 10 years ago

If you're using XactMeasure, ditch the creation of the tertiary feature and TYPE in "B-C" as the tertiary datum in the FCF builder.
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Roberto over 10 years ago

When constructing an alignment follow this sequence: 1) Level, 2) Rotation, 3) Origin.

A1 alignment is missing Rotation, A2 alignment has rotation but after levelling and origin.
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NUGUY over 10 years ago

When constructing an alignment follow this sequence: 1) Level, 2) Rotation, 3) Origin.

A1 alignment is missing Rotation, A2 alignment has rotation but after levelling and origin.

+1
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Shane-o over 10 years ago

Thank you all, I did realized I was overthinking, just like you mentioned before all I had to do was rotate. DUH
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