M08 & M09 CNC M-Codes: Flood & Mist Coolant Control

M08 turns on the primary flood coolant pump, while M09 turns off all coolant systems. Proper coolant management prevents thermal tool failure, flushes chips, and protects surface finishes.

Engineering Specifications & Parameters

M07 Function	Mist / Secondary Coolant ON
M08 Function	Flood Coolant Pump ON
M09 Function	All Coolant Systems OFF
M88 Function	High-Pressure Through-Spindle Coolant

Standard Coolant Commands

M08: Flood Coolant ON
M07: Mist Coolant / Through-Spindle Air Blast ON
M88: Through-Spindle Coolant (TSC) ON
M09: All Coolant OFF

Programming Protocol

Turn M08 on after moving to initial clearance height (Z50), and turn M09 off immediately before the tool retracts to home for tool changing.

Frequently Asked Questions

Why should M08 be activated before entering the cut?

Engaging the cutter before coolant is flowing creates thermal shock on the carbide insert when cold coolant suddenly hits the hot tool, causing micro-fractures.