Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 401)

100

101

AxisMotion

Chapter 12

12-29

When a G28 is executed in a part program (or through MDI) after the axes

have already been homed, it causes a return to machine home. In this case,

the axes speci fied in the G28 block simply go to their respective home

position in the machine coordinate system after moving to a programmed

intermediate point. They do not

repeat the homing routine of moving to

the limit switches and searching for the encoder marker. For example,

executing the block:

G28 X__ Z__;

in either absolute or incremental mode would return the axes automatically

to the machine home via an intermediate point. The control stores the

intermediate point specifi ed by the axis words (X, Z) in memory to be used

as the point of return for the automatic return from

machine home

operation called out by G29.

The return operation generates two axis moves both executed at the rapid

feedrate. The first move is to the intermediate point and the second is to

the axis home position.

Although this command moves the axes at rapid feedrate as if in G00

mode, it is not modal. If G01, G02, or G03 modes are active, they are only

temporarily cancel ed for the return to home moves.

Only the axes specified in the G28 block are returned to home. For

example:

N1 G28 X4.0; (X-axisis moved tohome aftermoving to4.0)

N2 G28 X4.0 Z2.0; (Xand Z axesare moved tohome aftermoving to

(4.0, 2.0))

12.4.2

Automatic Return to

Machine Home (G28)

1 2 ... 396 397 398 399 400 401 402 403 404 405 406 ... 819 820

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Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 401

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