Scanning flatness is a specified area

We need to scan a surface with a hole in it and measure the flatness in a specified radius around the hole. Is there a way to set the radius so that only the specified area is reported instead of the entire scanned surface?

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Neil Challinor over 3 years ago

You would need to use a SELECT cop operator using the circular method to segregate the part of the surface you are interested in. Then you could create a plane from the selected points and report flatness of that plane. I must point out though, that unless it's a fairly large flatness tolerance, laser data may not be accurate enough.

This is a mocked up example of how I would do it (all data is offline)

Extract the circle first.

CIR1 =FEAT/LASER/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<2917.46,-696.5,757.96>,<0,1,0>,13.041
ACTL/<2917.49,-696.5,757.99>,<0,1,0>,13.013
TARG/<2917.46,-696.5,757.96>,<0,1,0>
ANGLE VEC=<-1,0,0>
DEPTH=0.01,START ANG=180,END ANG=5
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW_LASER_PARAMETERS=NO

Create a new alignment that origins X, Y & Z on your circle

A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/TRANS,XAXIS,CIR1
ALIGNMENT/TRANS,YAXIS,CIR1
ALIGNMENT/TRANS,ZAXIS,CIR1
ALIGNMENT/END

Insert the SELECT cop operator then edit the X, Y, Z, I, J, K and Diameter values in the edit window (you will need to be in command mode)

COPSELECTION1=COP/OPER,SELECT,CIRCLE,INSIDE=YES,FRONT_FACING=NO,
<0,0,0>,<0,1,0>,16,0,
SIZE=1714,REF=COP1,,

Construct a BFRE plane from the segregated points

PLN1 =FEAT/PLANE,CARTESIAN,TRIANGLE,NO,LEAST_SQR
THEO/<-0.115,0,4.151>,<0,1,0>
ACTL/<-0.115,0,4.151>,<0,1,0>
CONSTR/PLANE,BFRE,COPSELECTION1,,
OUTLIER_REMOVAL/ON,3
FILTER/OFF,WAVELENGTH=0

Report flatness of the plane

FCFFLAT1 =GEOMETRIC_TOLERANCE/STANDARD=ISO 1101,SHOWEXPANDED=YES,
UNITS=MM,OUTPUT=BOTH,ARROWDENSITY=100,
SEGMENT_1,FLATNESS,1,TOL_ZONE_MATH=DEFAULT,
TEXT=OFF,CADGRAPH=OFF,REPORTGRAPH=OFF,MULT=10,
MEASURED:
PLN1:0.000,
ADD
FEATURES/PLN1,,

Reply

Neil Challinor over 3 years ago

CIR1 =FEAT/LASER/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<2917.46,-696.5,757.96>,<0,1,0>,13.041
ACTL/<2917.49,-696.5,757.99>,<0,1,0>,13.013
TARG/<2917.46,-696.5,757.96>,<0,1,0>
ANGLE VEC=<-1,0,0>
DEPTH=0.01,START ANG=180,END ANG=5
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW_LASER_PARAMETERS=NO

Create a new alignment that origins X, Y & Z on your circle

A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/TRANS,XAXIS,CIR1
ALIGNMENT/TRANS,YAXIS,CIR1
ALIGNMENT/TRANS,ZAXIS,CIR1
ALIGNMENT/END

Insert the SELECT cop operator then edit the X, Y, Z, I, J, K and Diameter values in the edit window (you will need to be in command mode)

COPSELECTION1=COP/OPER,SELECT,CIRCLE,INSIDE=YES,FRONT_FACING=NO,
<0,0,0>,<0,1,0>,16,0,
SIZE=1714,REF=COP1,,

Construct a BFRE plane from the segregated points

PLN1 =FEAT/PLANE,CARTESIAN,TRIANGLE,NO,LEAST_SQR
THEO/<-0.115,0,4.151>,<0,1,0>
ACTL/<-0.115,0,4.151>,<0,1,0>
CONSTR/PLANE,BFRE,COPSELECTION1,,
OUTLIER_REMOVAL/ON,3
FILTER/OFF,WAVELENGTH=0

Report flatness of the plane

FCFFLAT1 =GEOMETRIC_TOLERANCE/STANDARD=ISO 1101,SHOWEXPANDED=YES,
UNITS=MM,OUTPUT=BOTH,ARROWDENSITY=100,
SEGMENT_1,FLATNESS,1,TOL_ZONE_MATH=DEFAULT,
TEXT=OFF,CADGRAPH=OFF,REPORTGRAPH=OFF,MULT=10,
MEASURED:
PLN1:0.000,
ADD
FEATURES/PLN1,,

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