CNC Router Feed Rate Calculator
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Understanding CNC Router Feed Rate
The feed rate of a CNC router is a critical parameter that determines how quickly the cutting tool moves through the material. It's typically measured in millimeters per minute (mm/min) or inches per minute (IPM). Setting the correct feed rate is essential for achieving a good surface finish, maximizing tool life, and preventing damage to both the workpiece and the cutting tool.
Spindle Speed (RPM): This is the rotational speed of the cutting tool, measured in revolutions per minute. Higher spindle speeds can sometimes allow for faster cutting, but must be balanced with other factors.
Chip Load (mm/tooth): This is the thickness of the material that each cutting edge (tooth) of the tool removes with each revolution. A proper chip load ensures that chips are cleared efficiently and prevents excessive heat buildup and tool wear.
Number of Flutes: This refers to the number of cutting edges on the router bit. Tools with more flutes can often achieve higher feed rates for a given chip load, as the load is distributed among more cutting edges.
The formula used in this calculator is a fundamental one for determining the optimal feed rate:
Feed Rate (mm/min) = Spindle Speed (RPM) × Chip Load (mm/tooth) × Number of Flutes
Choosing the correct feed rate often involves a bit of trial and error, considering the specific material being cut, the type of cutter, the rigidity of the machine, and the desired finish. This calculator provides a starting point based on the core relationship between these parameters.