Rotate

Coordinate System Rotation

:	PCS→Rotate
Keyboard	Main Menu	Toolbar

Rotate permits an existing PCS to be rotated in space about one of its own axes. A PCS can only be rotated about one axis at a time. Compound rotations must be done in two or more successive steps. It is important to note the following rotation conventions:

about X:	a positive angle produces a counter-clockwise rotation when looking in the -X direction.
about Y:	a positive angle produces a counter-clockwise rotation when looking in the +Y direction.
about Z:	a positive angle produces a counter-clockwise rotation when looking in the -Z direction.
		figure 1, Rotate PCS Dialog

In the Rotate PCS Dialog, see figure 1, we show a request to rotate the current PCS 25° around the X axis. To ensure only one axis of rotation, any entry in Y or Z, would result in clearing the entered value in X. In the examples shown in figure 2, a rotation is applied to each axis with its corresponding change in relationship to the sample part.

Note !

Note that the sense of directional measurements made by specifying a direction using directional keys; +X, -Y, etc. rotates with a PCS rotation. After rotating a PCS whose axes are essentially aligned with the MCS axes by 90º about the PCS Y axis, a +X measurement is understood to be directed upward instead of to the right, since that is now the direction of the +X axis.

A Rotate PCS feature  once applied creates a new Part Coordinate System. To edit the existing rotation value when there are features using the rotated PCS is allowed, but a warning is provided to rebuild all coordinate systems by running the program from the beginning.

figure 3, Sub Menu

To edit the existing rotation feature, highlight that feature and bring up the sub menu by right clicking, see figure 3. The ability to edit a translated feature is only available when the translate feature has absolute entered values, not values derived from the last feature option.

Enter the new rotate value in the space provided, see figure 1, and press the <Ok> button. Geomet will display a warning that the features after translation step will no longer have valid positional data, see figure 4.

figure 4, Warning Statement

At this time, save the part inspection file and run the file to rebuild the Part Coordinate Changes.