Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Uživatelský manuál stáhnout pdf (Strana 402)

100

101

AxisMotion

Chapter 12

12-30

Figure 12.18

Automatic Ret urn to Machine Home (G28)

Intermediate point

Machinehome

12032-I

Usually a G28 is followed by a G29 (automatic return from machine

home) in a part program; however, the control stores the intermediate point

in memory for use with any subsequent G29 block executed before power

down. Only one intermediate point is stored for each axis. When a G28 is

programmed with a new intermediate point, any axis not programmed in

that block remains at the old value. For example:

N1 G28 X4.0 Z3.0; Intermediate pointX=4 Z=3

N2 G28 Z2.0; New intermediate point X=4,Z=2

Important: When the control executes a G28 or G30 block, it temporarily

removes any offsets and compensation during the axis move to the

intermediate point. The offsets and/or compensation are automatically

re-activated during the first block containing axis motion following the

G28 or G30 unless that block is a G29 block. If a G29 follows, the offs ets

and/or compensation remain deactivated on the way to the intermediate

point and are re-activated when the axis moves from the intermediate point

back to the point indicated in the G29 block.

When a G29 is executed in a part program (or through MDI), the axis or

axes move first to the intermediate point, and then to the position indicated

12.4.3

Automatic Return from

Machine Home (G29)

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