Printed from Kezuriba (kezuriba.net/en/nc/g20/)
G20
Machining center, LatheModal, group 06Inch input
⌨Format and notes
G20 (as a standalone block at the start of the program)
- Place it at the start of the program, before any motion command, and do not switch midway (NIST recommendation)
- On Haas, you check that the setting (Setting 9) matches G20/G21
≠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 |
|---|---|---|---|
| Siemens (ISO dialect) | Machining center | code | G70 (Siemens native mode)In Siemens' native language, inch/metric are G70/G71. In ISO dialect mode they are G20/G21 |
📚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
- Haas Automation, Inc. — Mill Operator's Manual – 17 Mill G-Codes (online version) haascnc.com
- Haas Automation, Inc. — Lathe Operator's Manual – 16 Lathe G-Codes (online version) haascnc.com
- National Institute of Standards and Technology (NIST), USA — The NIST RS274NGC Interpreter – Version 3 (NISTIR 6556, 2000) nvlpubs.nist.gov