If you are a CNC programmer, you know that feed rate and spindle speed are two important parameters that affect the quality of your machined parts. But do you know how they work and how to optimize them for different materials and tools? In this article, we will explain the difference between feed rate and spindle speed, and how they affect the surface finish and dimensional accuracy of CNC machined parts.

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In wood working... We use feed rate, rpm and number of flutes or cutting edges to calculate 'chip load'. Proper chip load keeps tooling cooler/lasting longer and lowers stress on the 'machine' all while improving cut quality.... See the tooling geometry section of this article below for much more accurate information on this topic.

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Spindle speed is the rotational speed of the cutting tool. It is usually measured in revolutions per minute (RPM) or surface feet per minute (SFM). Spindle speed determines how fast the cutting edges of the tool contact the workpiece, and how much force is applied on the material. A higher spindle speed means more cutting edges per unit of time, but also more vibration and noise, which can affect the dimensional accuracy and the surface finish. A lower spindle speed means fewer cutting edges per unit of time, but also less vibration and noise, which can improve the dimensional accuracy and the surface finish.

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The harmonics of the machine also play a roll in surface finish. I have had a machine that leaves better surface finish at 12k RPM than at 10k because the harmonics of the spindle was smoother. You can feel this by placing your hand on the machine running the spindle, with the finishing tool, at different RPM to find out where it’s the smoothest.

The optimal feed rate and spindle speed depend on the material properties of the workpiece and the tool. Different materials have different hardness, strength, ductility, and thermal conductivity, which affect how they react to the cutting forces and heat. For example, harder materials require lower feed rates and higher spindle speeds to avoid excessive tool wear and chipping. Softer materials require higher feed rates and lower spindle speeds to avoid excessive heat and deformation.

Feed rate is the speed at which the cutting tool moves along the workpiece. It is usually measured in inches per minute (IPM) or millimeters per minute (MM/MIN). Feed rate determines how much material is removed per unit of time, and how much heat is generated by the cutting process. A higher feed rate means faster material removal, but also more heat and friction, which can degrade the tool life and the surface quality. A lower feed rate means slower material removal, but also less heat and friction, which can improve the tool life and the surface quality.

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Surface finish is impacted by several issues, thus 1-material to be machined 2-speed 3-feed 4-depth of cut 5-cooling lubricant 6-tool geometry Some hard material like chrome when being machined with ceramic inserts would require high speed (ceramic inserts cut better and last longer with more heat emanating from friction), same material when cut using ni- hard/amborite inserts would require slower speeds for better finish ....softer material like copper would require both high speed and high feed and oil based lubricant for better finish so it all boils down to a combination of a variety of factors.

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If you reference the formula above Feed Rate (inches per minute) = RPM x Chip Load per Tooth x Number of Flutes you see that in order to calculate this you need ...

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The optimal feed rate and spindle speed also depend on the tool geometry, such as the diameter, the number of flutes, the helix angle, and the rake angle. Different tool geometries have different cutting characteristics, such as the chip load, the shear angle, and the cutting force. For example, larger diameter tools require lower spindle speeds and higher feed rates to maintain a constant chip load and avoid overheating. Smaller diameter tools require higher spindle speeds and lower feed rates to maintain a constant chip load and avoid chatter.

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Lowering the feed rate too slow can cause the tool to rub instead of cut causing the tool to prematurely wear out. When you have proper speeds and feeds you can use the chip like a heat sink putting the heat into the chip instead of the tool or material.

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The surface finish and dimensional accuracy of CNC machined parts are influenced by the feed rate and spindle speed, as well as by other factors, such as the tool wear, the coolant, the clamping, and the machine rigidity. The surface finish is the smoothness or roughness of the machined surface, which affects the appearance, the friction, and the corrosion resistance of the part. The dimensional accuracy is the deviation or tolerance of the machined dimensions, which affects the fit, the function, and the performance of the part. To achieve a high-quality surface finish and dimensional accuracy, you need to select the appropriate feed rate and spindle speed for your material and tool, and adjust them according to the cutting conditions and the desired results.

I disagree, harder materials tend to require slower feeds and lower SFM to keep tool temps down. You need to look at the manufactured recommended surface foot for each material.

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