Printed from Kezuriba (kezuriba.net/en/nc/g30/)

G30

Machining center, LatheOne-shot, group 00

2nd (3rd, 4th) reference point return

⌨Format and notes

G91 G30 P2 Z0 (2nd reference point if P is omitted)

The tool change position, etc., is set on the machine as the 2nd reference point and the tool returns there
The intermediate point works the same as in G28

Diagram: G30: return to 2nd reference point via intermediate point

Same motion as G28, but the destination is the reference point registered in the machine (e.g., tool change position). The commanded coordinates are the intermediate point on the way.

≠Differences between controls and machines

The same code can be written or assigned differently depending on the CNC control and the machine builder. Always check your machine’s manual.

Source	Machine	Item	Detail
Haas	Machining center	existence	G30 not in the listG30 is not listed in the Haas mill and lathe G-code lists (only G28/G29)

📚Sources

The meaning shown agrees in at least two sources (agreement confirmed). Explanations are written in our own words.

Siemens AG — SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D Programming Manual ISO Milling, 04.2007 Edition (6FC5398-7BP10-0BA0) cache.industry.siemens.com
Siemens AG — SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D Programming Manual ISO Turning, 04.2007 Edition cache.industry.siemens.com
National Institute of Standards and Technology (NIST), USA — The NIST RS274NGC Interpreter – Version 3 (NISTIR 6556, 2000) nvlpubs.nist.gov
Haas Automation, Inc. — Mill Operator's Manual – 17 Mill G-Codes (online version) haascnc.com