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M8 Flood coolant on
Mach3 Mach4 M-code · Mill
Turns on the flood coolant output.
Format
M8
Addresses
| Address | What it does |
|---|---|
M8 | No address words |
How it works
Modal, coolant group. Cancel with M9.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
T1 M6 (TOOL CHANGE)
S2500 M3 (SPINDLE ON)
G43 H1 Z1.0 M8 (FLOOD ON)
…
T1 M6 (TOOL CHANGE)
S2500 M3 (SPINDLE ON)
G43 H1 Z1.0 M8 (FLOOD ON)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- On a router M8 often drives a vacuum or dust shoe relay. Check what the builder wired to it.
- M7 and M8 can be on at the same time.
Related codes
M8 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Coolant on |
| Haas NGC | Coolant on |
| Doosan (Fanuc) | Coolant on (upper side) |
| DMG Mori MAPPS (Fanuc) | Coolant discharge ON |
| Mazak (EIA) | Flood coolant ON |
| Okuma OSP | Coolant on (Lathes & Mills) |
| Mitsubishi M70 M80 | Coolant on |
| Brother Speedio | Coolant on |
| Siemens 840D 828D | Coolant on |
| Heidenhain TNC (ISO) | Coolant on |
| Fagor 8055 8065 | Coolant on (builder defined) |
| LinuxCNC Tormach | Flood coolant on |
| Centroid CNC12 Acorn | Flood coolant on |
| Hurco WinMax (NC) | Flood coolant on |
| Fadal | Coolant on |
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Open M8 in the app All Mach3 Mach4 M-codes