CNC Machinist Calculator UltraG16 Polar coordinate command
Fanuc G-code · Mill
In G16 the first axis word of the plane is a radius and the second is an angle. Handy for bolt circles. Angles are measured counterclockwise from the plus first axis.
Format
G16 then X(radius) Y(angle)
Addresses
| Address | What it does |
|---|---|
X | Radius in the G17 plane |
Y | Angle in degrees, counterclockwise from plus X |
How it works
Modal, group 17. Cancel with G15.
Example program
G90 G54 G00 X0. Y0. (WORK ZERO AT CIRCLE CENTER)
G43 H06 Z1. M08 (CLEARANCE)
G16 (POLAR ON)
G81 X1.5 Y0. Z-.5 R.1 F8. (HOLE AT 0 DEG ON 3 INCH BC)
…
G43 H06 Z1. M08 (CLEARANCE)
G16 (POLAR ON)
G81 X1.5 Y0. Z-.5 R.1 F8. (HOLE AT 0 DEG ON 3 INCH BC)
…
The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- In G90 the center of the polar system is the work zero. In G91 for the radius, the center is the current position.
- Move the work zero to the bolt circle center with G52 or a work offset first.
- Always cancel with G15 before ordinary moves.
Related codes
G16 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Mazak (EIA) | Polar coordinate input on |
| Okuma OSP | Work coordinate system select, one block |
| Brother Speedio | Polar coordinate command |
| Heidenhain TNC (ISO) | Tangential arc, polar |
| Fagor 8055 8065 | Main plane by two axes |
| Mach3 Mach4 | Polar coordinates on |
| Hurco WinMax (NC) | Polar coordinates |
Every G-code for Fanuc in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open G16 in the app All Fanuc G-codes