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G50 Scaling and mirroring off / Set position or max spindle speed
Centroid CNC12 Acorn G-code · Mill, Lathe
On mills: Scaling and mirroring off
Cancels scaling and mirror image started with G51.
Format
G50
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal.
Example program
G51 X0 Y0 Z0 I-1. J1. K1. ; MIRROR X
M98 P9100 ; RUN THE PROFILE
G50 ; MIRROR OFF
M98 P9100 ; RUN THE PROFILE
G50 ; MIRROR OFF
Example is in inch. Check offsets and clearances first.
Watch out for
- On a Centroid lathe G50 means something else: set position or max RPM.
On lathes: Set position or max spindle speed
With X and Z, sets the current position to those values. With S, sets the maximum RPM for constant surface speed in G96.
Format
G50 X Z or G50 S
Addresses
| Address | What it does |
|---|---|
X Z | New current position |
S | Maximum RPM in G96 |
How it works
One shot. The S limit stays until changed.
Example program
G20 G99 G40 G97 ; INCH, FEED PER REV, RPM MODE
T0101 ; TOOL 1 WITH OFFSET 1
G50 S2500 ; NEVER OVER 2500 RPM
G96 S600 M3 ; CSS 600 SFM
…
T0101 ; TOOL 1 WITH OFFSET 1
G50 S2500 ; NEVER OVER 2500 RPM
G96 S600 M3 ; CSS 600 SFM
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Always give G50 S before G96 so the spindle cannot run away near X0.
- G50 with axis words shifts the part zero. Most shops use G54 to G59 instead.
Related codes
G50 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Scaling cancel |
| Haas NGC | Scaling cancel |
| Mazak (EIA) | Scaling cancel, machining center |
| Okuma OSP | Scaling cancel |
| Mitsubishi M70 M80 | Scaling cancel |
| Brother Speedio | Scaling cancel |
| Fagor 8055 8065 | Controlled corner rounding |
| Mach3 Mach4 | Scaling cancel |
| Hurco WinMax (NC) | Scaling cancel |
| Fadal | Ramp slope control cancel |
| Swiss (Citizen Star) | Max spindle speed and coordinate set |
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