G50 and G51 Scaling and Mirroring

G50, G51 - Scaling / Mirroring (Optional):

G51 scales program G-codes relative to a scaling center point defined as position (X, Y, and Z).

G50 – Cancels the scaling factor applied

 A G51 applies scaling/mirror to all positions, lines, and arcs following this G-code until a G50 are entered. Specify scaling factors with a value I, J, K. The X, Y, and Z parameters are the coordinates of the scaling center. If the scaling center is not specified, the default scaling center is the current cutter position. To mirror, enter a negative value for the scaling factor.

Example, Scaling:

G51 X0.0 Y0.0 Z0.0 I3.0 J2 K1; turn scaling on

G00 X0.0 Y0.0 Z1.0; rapid to x0, y0, Z1

G01 X1.0 Y0.0 Z1.0; line to X1, Y0, Z1

G01 X1.0 Y1.0 Z1.0; line to X1, Y1, Z1

G01 X0.0 Y1.0 Z1.0; line to X0, Y1, Z1

G01 X0.0 Y0.0 Z1.0; line to X0, Y0, Z1

G01 X0.0 Y0.0 Z0.0; line to X0, Y0, Z0

G50; cancel scale

For this G51, the following program lines were scaled 3:1 in the X direction, 2:1 in the Y direction, and

1:1 in the Z direction. If no scale factor is specified, the default is 1:1 for all axes.

Example, Mirroring:

G51 X-0.5 Y0.0 Z.0 I-1 J1 K1; turn mirror on.

G00 X0.0 Y0.0 Z1.0; rapid traverse to X0, Y0, Z1

G01 X1.0 Y0.5 Z1.0; line to X1, Y.5, Z1

G01 X0.0 Y1.0 Z1.0; line to X0, Y1, Z1

G01 X0.0 Y0.0 Z1.0; line to X0, Y0, Z1

G50; cancel scale

If scaling factors are the same for all the axes, parameter P can be used.

Example:

G51 X1.0 Y2.0 Z0.0 P2.5; scale all axes a factor of 2.5. If an arc is scaled with uneven scaling factors, the result will depend on how the arc center and radius were specified:

NOTE: If the arc radius was specified with R, the radius will be scaled by the larger of the two circular plane scale factors. The result will be a circular arc between the scaled arc start and the scaled arc end.

NOTE: If the arc center was specified with I, J, and/or K, the centers will be scaled by the appropriate axis scale factors. The result will be a circular arc from the scaled arc start, around the scaled center, and usually with a line from the end of the circular arc to the scaled arc end.

NOTE: In no case can an ellipse be generated using scaling.