A coolant system on a CNC (Computer Numerical Control) machine is a system used to cool the cutting tool and workpiece during the machining process. It is typically used to remove heat generated by the cutting process, to lubricate the cutting tool and workpiece, and to flush away chips and debris.

The coolant system can be either a flood coolant system or a through-tool coolant system. Flood coolant systems spray coolant onto the cutting tool and workpiece, whereas through-tool systems pump coolant directly into the cutting tool and out through the cutting edge.

The coolant system typically includes a pump, a reservoir, hoses, nozzles, and a filter. The pump is used to circulate the coolant, the reservoir is used to hold the coolant, the hoses are used to transport the coolant, the nozzles are used to direct the coolant onto the cutting tool and workpiece, and the filter is used to remove debris from the coolant.

Coolant systems are important in CNC machining for several reasons:

• They help to remove heat from the cutting process, which can prolong the life of the cutting tool and improve the quality of the finished workpiece.
• They provide lubrication, which helps to reduce friction and wear on the cutting tool and workpiece.
• They flush away chips and debris, which helps to keep the cutting tool and workpiece clean and prevent damage.

Overall, the coolant system is an important component of CNC machines, as it helps to improve the efficiency and quality of the machining process, by removing heat, lubricating the cutting tool and workpiece and flushing away chips and debris.