measurement of parallelism between lines and methodology of inspection

[jigars]

I need to check parallelism of a slot at the end of disk and getting different value for different length of line generated as center line
of slot.
Any idea how PC-DMIS calculates parallelism’s values.

Also,
Need help for the following,

Requirement: Slot C/L to be parallel within 0.004 IN./IN.

Description:
I am generating parallelism of these two lines with tolerance of 0.014 (3.4625 x 0.004) not sure if i'm interpreting this right
I got result of 0.0002 but the part is showing nonconforming when costumer is inspecting the same part.
Dovetail slot length as per drawing is 0.226
Length of line generated for slot is 0.0704 and part C/L is 3.3913 as per program

Thanks in advance.


Untitled1.png

STARTUP    =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
            ALIGNMENT/END
            MODE/MANUAL
            CHECK/0.1,1
            MOVESPEED/ 100
            SCANSPEED/100
            FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, , 
            LOADPROBE/PRB#27
            TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
            MODE/DCC
PNT1       =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
            THEO/<0,-0.0009,-0.433>,<0.0001697,-1,0>
            ACTL/<0,-0.0009,-0.433>,<0.0001697,-1,0>
            TARG/<0,-0.0009,-0.433>,<0.0001697,-1,0>
            SHOW FEATURE PARAMETERS=NO
            SHOW CONTACT PARAMETERS=YES
              AVOIDANCE MOVE=BOTH,DISTANCE=0.3937
            SHOW HITS=NO
PNT2       =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
            THEO/<0.0006,-3.3922,-0.433>,<0.0001697,-1,0>
            ACTL/<0.0006,-3.3922,-0.433>,<0.0001697,-1,0>
            TARG/<0.0006,-3.3922,-0.433>,<0.0001697,-1,0>
            SHOW FEATURE PARAMETERS=NO
            SHOW CONTACT PARAMETERS=YES
              AVOIDANCE MOVE=BOTH,DISTANCE=0.3937
            SHOW HITS=NO
PART_CENTER_LIN=FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<0,-0.0009,-0.433>,<0.0001769,-1,0>
            ACTL/<0,-0.0009,-0.433>,<0.0001769,-1,0>
            CONSTR/LINE,BF,3D,PNT1,PNT2,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
PNT_S1     =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
            THEO/<0,-3.3256,-0.25>,<0,0,1>
            ACTL/<0,-3.3256,-0.25>,<0,0,1>
            TARG/<0,-3.3256,-0.25>,<0,0,1>
            SHOW FEATURE PARAMETERS=NO
            SHOW CONTACT PARAMETERS=YES
              AVOIDANCE MOVE=BOTH,DISTANCE=0.3937
            SHOW HITS=NO
PNT_S2     =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
            THEO/<0.0002,-3.396,-0.25>,<0.0000684,0.0000105,1>
            ACTL/<0.0002,-3.396,-0.25>,<0.0000684,0.0000105,1>
            TARG/<0.0002,-3.396,-0.25>,<0.0000684,0.0000105,1>
            SHOW FEATURE PARAMETERS=NO
            SHOW CONTACT PARAMETERS=YES
              AVOIDANCE MOVE=BOTH,DISTANCE=0.3937
            SHOW HITS=NO
SLOT_CENTER_LIN=FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<0,-3.3256,-0.25>,<0.0028409,-0.999996,0>
            ACTL/<0,-3.3256,-0.25>,<0.0028409,-0.999996,0>
            CONSTR/LINE,BF,3D,PNT_S1,PNT_S2,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
DIM PARL1= PARALLELISM OF LINE SLOT_CENTER_LIN,RFS TO LINE PART_CENTER_LIN,RFS EXTENDLENGTH=0.0000  UNITS=IN ,$
GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH
AX    NOMINAL       +TOL       -TOL       MEAS        DEV     OUTTOL
M       0.0000     0.0140     0.0000     0.0002     0.0002     0.0000 #----

[AndersI]

As the result of parallelism is in mm (or inch), while being an effect of an angle, you need to specify the length to be used in the calculation, either by measuring the correct length, or specifying it with (P).

[jigars]

By specifying do you meant using Projection Distance ?
I need the length to be used in the calculation as 1 inch
but the length of line whose // needs to be checked is 0.0704 inch.

[AndersI]

Yes - projection distance