![]() The zero return position may not make a good pallet-change position, so the builder may incorporate a second reference position for X and Y. G30 is often used when a machine tool builder must define a special position in each axis, such as with pallet changers on machining centers. It works much like G28, except the ending position is now definable through parameter settings. G30 is an optional feature and may not be included on your machines. G30 – Return to second reference position For this reason, I recommend programming any obstruction-clearing motions with basic positioning commands (G00, G01, etc.), and avoiding G29. ![]() ![]() and ideal software for machining and CNC programming that provides users with a. If the intermediate position changes from tool to tool, and if tools are run out of sequence (as is often necessary when rerunning tools), a tool may not move to its expected intermediate position. This example was done using BobCAD CAM V33 SP2 Mill 3 Axix Pro + 4 Axis. While this could be helpful when you must avoid some kind of obstruction, you must be very careful when using G29.
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