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Chapter 14 Axis Motion Figure 14.8 Automatic Return From Machine Home, Results of Example 14.7 X Machine home 200 N30 150 N40 N30 N10 N20 100 50 Z 50 100 150 200 Important: When a G29 is executed, tool offsets and/or cutter compensation are deactivated on the way to the intermediate point, and they are re-activated when the axis moves from the intermediate point back to the point indicated in the G29 block. 14.2.4 Machine Home Return Check (G27) 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 takes 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 tool offset modes have been cancelled. 14-16
