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G50 Scaling cancel / Spindle speed clamp
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Scaling cancel
On the M system, G50 cancels scaling. It is not a spindle clamp like on the lathe.
Format
How it works
Modal, group 11.
Example program
M98 P2000 (CUT SHAPE)
G50 (SCALING OFF)
Example is in inch. Check offsets and clearances first.
Watch out for
- Cancel scaling before tool changes and reference returns.
On lathes: Spindle speed clamp
In G code list 2, G50 S sets the maximum spindle RPM for constant surface speed. G50 X Z sets the coordinate system.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
Addresses
| Address | What it does |
|---|---|
S | Maximum spindle RPM |
Q | Minimum spindle RPM |
X Z | Current position value for coordinate setting |
How it works
Modal value. Stays until changed.
Example program
G96 S500 M03 (500 SFM)
G00 X2.1 Z.1 (APPROACH)
Example is in inch. Check offsets and clearances first.
Watch out for
- Always set G50 S before G96. Without it the spindle can over speed at small diameters.
- In G code lists that use G92 for this, G50 is not the clamp. Check parameter for the list in use.
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 |
| Brother Speedio | Scaling cancel |
| Fagor 8055 8065 | Controlled corner rounding |
| Mach3 Mach4 | Scaling cancel |
| Centroid CNC12 Acorn | Scaling and mirroring off |
| Hurco WinMax (NC) | Scaling cancel |
| Fadal | Ramp slope control cancel |
| Swiss (Citizen Star) | Max spindle speed and coordinate set |
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