Milling Cutters and Cutting Fluids - 5: Speeds and Feeds
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
When machining a material, it is necessary to use the proper feed and speed for that specific material.

The speed of the cutter or end mill (in RPM) is calculated from the simplified formula:

RPM = (CS x 4 ) / D

Where

CS is the Cutting speed of the particular material (see table) in Surface Feet per Minute

D is the diameter of the milling cutter

Feed is calculated from the following formula:

Feed = RPM x Chip load per tooth x Number of teeth on cutter

Important note: Chip load per tooth and cutting speed vary by manufacturer, material machined, material of the cutter, type of coolant used,... The examples in the chart are for illustration purpose only. Please consult Machinery's Handbook or the manufacturers specifications for further details.

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