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G90.1 Absolute arc center mode
LinuxCNC Tormach G-code · Mill and lathe
Makes arc I J K words absolute positions of the center, not offsets from the start.
Format
G90.1
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal, arc distance group. Cancel with G91.1.
Example program
G20 G17 G40 G49 G54 G80 G90 G94 (INCH, SAFE START)
G90.1 (ABSOLUTE ARC CENTERS)
G0 X1 Y0 Z-0.1
G2 X-1 Y0 I0 J0 F20 (CENTER AT X0 Y0)
…
G90.1 (ABSOLUTE ARC CENTERS)
G0 X1 Y0 Z-0.1
G2 X-1 Y0 I0 J0 F20 (CENTER AT X0 Y0)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Both center words for the plane must be given, or it is an error.
- Most CAM and hand programs expect G91.1. Switch back.
Related codes
G90.1 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Mach3 Mach4 | Absolute arc centers |
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