Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 340)

100

101

Coordinate Control

Chapter 11

11-24

To rotate the current work coordinate system , program this command:

G68 X__ Z__ R__;

Where: Is:

X, Z

thecenterofrotationusing only the two axis wordsthatareinthecurrentactive

plane (G17,G18,or G19). The value enteredwiththeseaxiswords representa

position in the current work coordinate system. The values specified with the

axiswords are alwaysabsolute coordinatevalues,the centerof rotati on cannot

be specified asan incrementalposition.

R theangl e of rotationthatthecoordinate systemistobe rotatedat. Enter a value

in unitsof degrees. R is alwaysmeasuredparalleltothe first majoraxisin the

currentplane. PositiveR is measuredcounter clockwise,and a negativeRis

measuredclockwise. Ifyou do notspecify an angle using an R wordin theG 68

block,thecontrolusesthe valueofthe “Programmable PartRotation”angle field

fromtherotationtable shown on page 11-30.

Important: If the first motion command following the G68 command is an

incremental move, the center of rotation as described in the G68 command

is ignored and the coordinate system is rotated about its zero point (see

Example 11.10). The first motion command following a G68 block cannot

be a circular move.

The control ignores any unnecessary parameters in the G68 block. Any G

codes other than a plane selection (G17, G18, or G19) or a change from

absolute or incremental mode (G90, or G91) specified in a G68 block

results in an error.

The G68 block does not create any axes motion. Position displays change

due to the alteration of the work coordinate system.

Any rotation of the work coordinate system by programming a G68

command rotates only the currently active work coordinate system. When

changing to a different work coordinate system, the rotation does not apply

to the new work coordinate system. When changing back to the rotated

coordinate system, the rotation is still in effect.

If you do not program an R word in the G68 block, the value of the angle

for programmed rotation is taken from the part rotation screen. Access this

screen as described for external part rotation on page 11-30. The last field

on this screen is the programmable part rotation angle. This angle is only

used when the R word is excluded in the G68 block.

11.6.1

Rotating the Current Work

Coordinate System (G68,

G69)

1 2 ... 335 336 337 338 339 340 341 342 343 344 345 ... 819 820

Comentarios a estos manuales

Sin comentarios

Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 340

Comentarios a estos manuales

Relacionado con productos y manuales para Equipo Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra