DCC alignment not automatically following manual alignment

STARTUP =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
ALIGNMENT/END
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. Hexagon example measurement routine showing how to align rotationally symmetric work pieces.
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. PLEASE NOTE: This measuremnt routine is intended to be run in off-line mode only.
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Alignment of rotationally symmetric work pieces

When aligning the work pieces in the PC-DMIS software, it is crucial that all variances
(3 translational and 3 rotational) are defined using the alignment menu.
If a work piece has no clear feature to identify the plane rotation (for example if the
work pieces are rotationally symmetric), appropriate theoretical auxiliary elements
must be used. In cases of this kind, the plane rotation step cannot simply be missed
out, and it should not be assumed that the relevant CMM axis will be automatically
used to define the second orientation.

For example:
The CAD model for thei routine depicts a rotationally symmetric work piecewhich is to
be aligned such that the measurement and the evaluation of all testing features can be
carried out clearly and reproducibly.

For clear alignment, only the two datum elements can be directly measured on the
work piece: the smaller of the three cylinders (Z1) (diameter of 10 mm, length 60 mm),
and the plane E1 (front face). Only these elements can be used to align the work piece.
There are no directly measurable elements for defining the rotation. 2 rotational and
2 translational variances will be established (rotation by X, rotation by Y,
translation to X, translation to Y) using cylinder Z1. Plane E1 determines the third
translational variance (translation to Z).

It is not possible to define the rotation by Z with the directly measurable elements.
This value must be defined using a theoretical element that includes suitable orientation
information. It is preferable to define a theoretical plane when doing this. It is not advisable
to use theoretical lines to define the orientation, since calculating the alignment becomes
unstable in certain cases.

The alignment plane must be defined as a theoretical auxiliary element.
If the work piece is aligned manually, this plane relates to the corresponding coordinate
system plane of the machine coordinate system. Defining an alignment plane for subsequently
defining the secondary orientation:

MODE/MANUAL
PREHIT/0.5
RETRACT/0.5
MOVESPEED/ 500
TOUCHSPEED/ 4
FLY/ON
FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, ,
LOADPROBE/LSPX1_3X50
TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
WORKPLANE/ZPLUS
$$ NO,
STEP 1 : Open the constructed plane dialogue window and choose "alignment" type.
Press the "create" button, to construct the theoretical plane.

NB:
The normal orientation of this plane corresponds, as standard, to the orientation
of the current working plane. By switching directly to command mode, it is also
possible to select the desired orientation (XPLUS; XMINUS, YPLUS, YMINUS, ZPLUS, ZMINUS).

This means that there is now a plane with a defined normal orientation as an element for
defining the remaining rotational variance. In the work piece programme, there are now
three elements available that contain information for defining all six variances. The
alignment of the work piece can now be fully defined.


E_ROT =FEAT/PLANE,CARTESIAN,TRIANGLE,NO
THEO/<0,0,0>,<1,0,0>
ACTL/<0,0,0>,<1,0,0>
CONSTR/PLANE,ALIGN,XPLUS
Z1 =FEAT/CONTACT/CYLINDER/DEFAULT,CARTESIAN,OUT,LEAST_SQR
THEO/<0,0,-60>,<0,0,1>,10,60
ACTL/<0,0,-60>,<0,0,1>,10,60
TARG/<0,0,-60>,<0,0,1>
START ANG=0,END ANG=360
ANGLE VEC=<1,0,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
E1 =FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<0,0,0>,<0,0,1>
ACTL/<0,0,0>,<0,0,1>
TARG/<0,0,0>,<0,0,1>
ANGLE VEC=<1,0,0>,RADIAL
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
$$ NO,
STEP 2 : Defining the work piece alignment

The fully constrained work piece alignment can now be created.
ZPLUS is leveled to cylinder Z1, the planar rotation is carried out explicitly by
rotating XPLUS to the theoretical plane E_ROT, which represents a coordinate system plane
of the machine coordinate system. Finally we origin X & Y on cylinder Z1 and Z on plane E1.

A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,Z1
ALIGNMENT/ROTATE,XPLUS,TO,E_ROT,ABOUT,ZPLUS
ALIGNMENT/TRANS,XAXIS,Z1
ALIGNMENT/TRANS,YAXIS,Z1
ALIGNMENT/TRANS,ZAXIS,E1
ALIGNMENT/END
$$ NO,
Note: If the plane rotation is not carried out explicitly with the theoretical element,
there will be no clear and reproducible work piece alignment. In such cases,
it may be necessary to recalculate the nominal values with the software.
This is why the described procedure must be respected, even if the work pieces
are rotationally symmetric.