Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Instrukcja Użytkownika Pobierz pdf (Strona 404)

100

101

AxisMotion

Chapter 12

12-32

Figure 12.19

Automatic Return From Machine Home, Results of Example 12.17

100

150 200

100

150

200

N10

N20

N30

N40

Machinehome

12157-I

Important: When a G29 is executed, of fsets and/or compensation is

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.

A G27 causes the control to move the axes at rapid directly to the machine

home position. Only the axes included in the G27 block are moved.

G27 X__ Z__;

The value entered with the axis name in the G27 block must be the

machine home coordinate for that axis. If it is not, no axis motion t akes

place and the control issues the error message:

“INVALID ENDPOINT IN G27 BLOCK”

Aside from this endpoint check, the only difference between a G27 block

and a G00 block requesting a move to the machine home coordinates is

that the G27 is not modal. If G01, G02, or G03 modes were active before

the G27 was executed, they are reactivated immediately after the G27

block is completed.

G27 block commands are usually given after wheel offset modes have

been cancelled.

If an attempt is made to execute a G27 before the axes have been homed,

the control enters cycle stop and the following error message occurs:

“MACHINE HOME REQUIRED OR G28”

12.4.4

Machine Home Return

Check (G27)

1 2 ... 399 400 401 402 403 404 405 406 407 408 409 ... 819 820

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