Alignment strategy

Hello All
I received one part to measure in CMM with PCDMIS platform, and I am bit confused to alignment strategy on this.
Attached drawing snap for your understanding

Here Datum A is bottom face, Datum B represented to 4 holes.
In program I followed by below steps

The part is in XY plane

Measure datum A
Measure 4 holes
Connect holes 1 & 4 with Line 1
Connect holes 2 & 3 with Line 2
Intersect Line 1 & 2 and get a IntPoint
Construct MidPoint between holes 2 & 4

Alignment:

Datum A - Spatial alignment in Z
MidPoint - Planar alignment in X
IntPnt - Origin XY

My concern,

Is my alignment strategy is correct? please suggest
How we can apply MMC to B datum?

I need help on this please

Thanks

Attached Files

Parents

Neil Challinor over 4 years ago

FCFLOC1 =POSITION : CYL1,CYL2,CYL3,...
FEATCTRLFRAME/SHOWNOMS=YES,SHOWPARAMS=YES,SHOWEXPANDED=YES,
CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,A RROWDENSITY=100,OUTPUT=BOTH,UNITS=MM,
COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
CUSTOMIZED DRF=NO
STANDARDTYPE=ASME_Y14_5
SIZE TOLERANCES/4,DIAMETER,12,0.11,-0.11
PRIMARY DIMENSION/POSITION,DIAMETER,0.05,<MC>,<PZ>,<len>,A,<dat>,<da t>
SECONDARY DIMENSION/,<tol>,<MC>,<dat>,<dat>,<dat>
NOTE/FCFLOC1
FEATURES/CYL1,CYL2,CYL3,CYL4,,
Set
<NEW>
CYL1
X:NOM=20
Y:NOM=85
<NEW>
CYL2
X:NOM=170
Y:NOM=85
<NEW>
CYL3
X:NOM=20
Y:NOM=10
<NEW>
CYL4
X:NOM=170
Y:NOM=10
<NEW>
FCFLOC2 =POSITION : CYL5
FEATCTRLFRAME/SHOWNOMS=YES,SHOWPARAMS=YES,SHOWEXPANDED=YES,
CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,A RROWDENSITY=100,OUTPUT=BOTH,UNITS=MM,
COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
CUSTOMIZED DRF=NO
STANDARDTYPE=ASME_Y14_5
SIZE TOLERANCES/1,DIAMETER,10,0.15,-0.15
PRIMARY DIMENSION/POSITION,DIAMETER,0.2,MMC,<PZ>,<len>,A,B,MMC,<size >,<dat>
SECONDARY DIMENSION/,<tol>,<MC>,<dat>,<dat>,<dat>
NOTE/FCFLOC2
FEATURES/CYL5,,
CYL5
X:NOM=0
Y:NOM=0
<NEW>
DATUMS
D2:NOM=12,+TOL=0.11,-TOL=-0.11

Reply

Neil Challinor over 4 years ago

FCFLOC1 =POSITION : CYL1,CYL2,CYL3,...
FEATCTRLFRAME/SHOWNOMS=YES,SHOWPARAMS=YES,SHOWEXPANDED=YES,
CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,A RROWDENSITY=100,OUTPUT=BOTH,UNITS=MM,
COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
CUSTOMIZED DRF=NO
STANDARDTYPE=ASME_Y14_5
SIZE TOLERANCES/4,DIAMETER,12,0.11,-0.11
PRIMARY DIMENSION/POSITION,DIAMETER,0.05,<MC>,<PZ>,<len>,A,<dat>,<da t>
SECONDARY DIMENSION/,<tol>,<MC>,<dat>,<dat>,<dat>
NOTE/FCFLOC1
FEATURES/CYL1,CYL2,CYL3,CYL4,,
Set
<NEW>
CYL1
X:NOM=20
Y:NOM=85
<NEW>
CYL2
X:NOM=170
Y:NOM=85
<NEW>
CYL3
X:NOM=20
Y:NOM=10
<NEW>
CYL4
X:NOM=170
Y:NOM=10
<NEW>
FCFLOC2 =POSITION : CYL5
FEATCTRLFRAME/SHOWNOMS=YES,SHOWPARAMS=YES,SHOWEXPANDED=YES,
CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,A RROWDENSITY=100,OUTPUT=BOTH,UNITS=MM,
COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
CUSTOMIZED DRF=NO
STANDARDTYPE=ASME_Y14_5
SIZE TOLERANCES/1,DIAMETER,10,0.15,-0.15
PRIMARY DIMENSION/POSITION,DIAMETER,0.2,MMC,<PZ>,<len>,A,B,MMC,<size >,<dat>
SECONDARY DIMENSION/,<tol>,<MC>,<dat>,<dat>,<dat>
NOTE/FCFLOC2
FEATURES/CYL5,,
CYL5
X:NOM=0
Y:NOM=0
<NEW>
DATUMS
D2:NOM=12,+TOL=0.11,-TOL=-0.11

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