Orbit machining mode ON

Q: What does Mazak G-code G148 do?

G148 — Orbit machining mode ON on the MAZATROL SmoothX control (INTEGREX e-670H). Orbit Machining refers to a special technique of chip removal by revolving a turning tool on an orbit of circular interpolation in an XY-plane (perpendicular to the virtual Z-axis), while synchro- nously rotating the tool on its axis by the milling spindle’s angular position control, so that the turning tool’s nose (cutting edge) may be kept (at the cutting point) normal to, or perpendicular to the tangent to, the circular path (surface to be machined). Thus the orbit machining function enables a quasi-turning operation to be achieved even on a machining center without turning functions as well as on an eccentric part of the workpiece. Commands relevant to the orbit machining are as follows. Arguments X and Y (“X0” and/or “Y0”) can be omitted if the workpiece coordinate 1. Always give a command of G148 with

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

Orbit Machining refers to a special technique of chip removal by revolving a turning tool on an orbit of circular interpolation in an XY-plane (perpendicular to the virtual Z-axis), while synchro- nously rotating the tool on its axis by the milling spindle’s angular position control, so that the turning tool’s nose (cutting edge) may be kept (at the cutting point) normal to, or perpendicular to the tangent to, the circular path (surface to be machined). Thus the orbit machining function enables a quasi-turning operation to be achieved even on a machining center without turning functions as well as on an eccentric part of the workpiece. Commands relevant to the orbit machining are as follows. Arguments X and Y (“X0” and/or “Y0”) can be omitted if the workpiece coordinate 1. Always give a command of G148 with the tool being set at a position in the ZX-plane that includes the center of orbital motion; otherwise an alarm will be caused (968 CANNOT USE 2. […]

G148 is one-shot (group 00) — it is valid only in the block where it is entered.

Programming format

Commands relevant to the orbit machining are as follows.

Address words

G148 (Xx Yy) : Orbit machining mode ON
G149 : Orbit machining mode OFF
M763 : Start of normal orbital motion
M764 : Start of reverse orbital motion
M765 : Stop of orbital motion
x, y: Center of orbital motion (to be specified with workpiece coordinates X and Y)
Arguments X and Y (“X0” and/or “Y0”) can be omitted if the workpiece coordinate
system need not be translated at all.

Source

Mazak PROGRAMMING MANUAL for EIA/ISO PROGRAM, manual H747PB0030E, section 30 ORBIT MACHINING: G148, G149 (OPTION), p. 3-11, 30-1. Reference and explanation only — not a reproduction of the manual.

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