Incremental data input

Q: What does Mazak G-code G91 do?

G91 — Incremental data input on the MAZATROL SmoothX control (INTEGREX e-670H). Setting of G90 or G91 allows succeeding dimensional data to be processed as absolute data or incremental data. Setting of arc radius (with address R) or arc center position (with addresses I, J, K) for circular interpolation, however, must always refer to incremental data input, irrespective of preceding G90 command. Inch command/metric command selection is possible with G-code commands.

Q: What is the programming format of G91?

G90 (or G91) Xx Yy Zz 1 ( : Additional axis)

Machine-specific. This G-code reference is specific to the Mazak INTEGREX e-670H / e-670H-S with the MAZATROL SmoothX control (EIA/ISO programming manual H747PB0030E). G-code availability depends on fitted options, and groups and behaviour differ between Mazak models and control generations — verify against the manual for your own machine before programming with any code.

What it does

Setting of G90 or G91 allows succeeding dimensional data to be processed as absolute data or incremental data. Setting of arc radius (with address R) or arc center position (with addresses I, J, K) for circular interpolation, however, must always refer to incremental data input, irrespective of preceding G90 command. Inch command/metric command selection is possible with G-code commands.

G91 is modal (group 03) — it stays in effect until another code of the same group replaces it.

Initial state: a parameter can select G91 as the initial modal condition — what your machine wakes up in depends on that setting.

Programming format

G90 (or G91) Xx
Yy
Zz
1 ( : Additional axis)

Address words

where G90: Absolute data input
G91: Incremental data input
G20: Inch command selection
G21: Metric command selection

Notes & precautions

Do not fail to give an F command appropriate to the new unit system after

Source

Mazak PROGRAMMING MANUAL for EIA/ISO PROGRAM, manual H747PB0030E, section 5-1-1 Absolute/Incremental data input: G90/G91, p. 3-11, 5-1, 5-2, 5-3. Reference and explanation only — not a reproduction of the manual.

Not sure how to use it? Ask the Mazatrol assistant →