Recommended Cutting Speeds using High-Speed Steel Tools. For Reamers use 1/2 to 2/3 speed given in this Table. For Carbide tools double the speeds.

End mill cutting speedformula

Every shaft and hole in engineering has a tolerance range (the allowable variation for any given size to achieve a proper function). Below are the ISO tolerance grades (mm) to calculate accurate hole and shaft measurements for designs.

Speeds in Surface Feet per Minute are specified for High-Speed Steel drill bits, and are approximate for normal drilling operations.

Carbideend MillRPM chart

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