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When starting, use lower range of CS and gradually increase to higher range 4. Know hardness of material to be machined 3. For longer cutter life, use lower CS in recommended range 2. simplify formula CS ( ft ) 90 12 xCS 4 xCS r / min circumfere nce(in.) 3 x3.1416 3 x3.1416 DĬutting Speed Rules for Best Results 1.
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diameter high-speed steel milling cutter for cutting machine steel (90 sf/min). Diameter of cutter affects this speed Calculate speed required to revolve a 3-in.For optimum use from cutter, proper speed must be determined.Milling Machine Cutting Speeds High-Speed Steel Cutter MaterialĪluminum 500–1000 150–300 Bronze Cast iron Type of work material Cutter material Diameter of cutter Surface finish required Depth of cut taken Rigidity of machine and work setup Important Factors in Determining Cutting Speed In milling machine, cutter revolves r/min depending on diameter for cutting speed.Work machined in a lathe, speed in specific number of revolutions per min (r/min) depending on its diameter to achieve proper cutting speed.Speed, in surface feet per minute (sf/min) or meters per minute (m/min) at which metal may be machined efficiently.Depth of cut – Several shallow cuts wastes time.Feed – Too slow, time wasted and cutter chatter – Too fast, cutter teeth can be broken.Cutting speed – Too slow, time wasted – Too fast, time lost in replacing/regrinding cutters.Follow the correct procedure for taking roughing and finishing cutsįactors Affecting the Efficiency of a Milling Operation.Select and calculate the proper feeds for various cutters and materials.Select cutting speeds and calculate the r/min for various cutters and materials.Motor mounted on top of head – provides drive to spindle through V-beltsĬutting Speed, Feed, and Depth of Cut Unit 60.Head attached to end of ram – Made to swivel head in one plane – Universal-type machines allow swivel in 2 planes.Overarm round and may be adjusted toward or away from column.Column often cast with base – Machined face provides ways for vertical movement of knee – Upper part machines to receive turret where overarm mounted.Base made of ribbed cast iron – May contain coolant reservoir.Jig boring Dovetail cutting T-slot and circular Many facing operations slot cutting done with fly cutter (cost reduction).Can machine in one, two, or three planes – X, Y, Z.Can be used for milling, drilling, boring, and reaming.Milling process may be vertical, horizontal, angular, or helical.Combines vertical spindle of drill press with longitudinal and traverse movements of milling machine.
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