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M41 Spindle low gear override / Spindle low gear
Haas NGC M-code · Mill, Lathe
On mills: Spindle low gear override
Forces the spindle into low gear on machines with a gearbox.
Format
M41
How it works
Modal, until M42 or a speed change that needs a new gear.
Example program
T1 M06 (3 INCH FACE MILL)
M41 (LOW GEAR FOR THE BIG FACE MILL)
S400 M03 (SPINDLE ON)
M41 (LOW GEAR FOR THE BIG FACE MILL)
S400 M03 (SPINDLE ON)
Example is in inch. Check offsets and clearances first.
Watch out for
- Only on machines with a two speed gearbox.
On lathes: Spindle low gear
Selects low gear on machines with a gearbox. Gives more torque at low RPM for big diameters.
Format
M41
How it works
Modal until M42.
Example program
M41 (LOW GEAR)
G96 S350 M03 (CSS 350 SFM)
G01 Z-1. F.02 (HEAVY CUT ON LARGE DIAMETER)
G96 S350 M03 (CSS 350 SFM)
G01 Z-1. F.02 (HEAVY CUT ON LARGE DIAMETER)
Example is in inch. Check offsets and clearances first.
Watch out for
- Only machines with a transmission have gears. Others ignore or alarm on these codes.
Related codes
M41 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Low gear range |
| Okuma OSP | Spindle gear range 1 |
| Siemens 840D 828D | Gear stage selection M40 to M45 |
| Fagor 8055 8065 | Spindle gear range 1 |
| Centroid CNC12 Acorn | Select low gear range, macro |
| Hurco WinMax (NC) | Single touch probing |
| Fadal | Low range RPM |
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