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****************** Recommended Reading: Manufacturing Engineering and Technology Marks' Standard Handbook for Mechanical Engineers ******************
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The recommended surface cutting speed (S); or the speed at which the material passes the cutting edge of the tool; for any particular material can generally be found in most good machining handbooks. Typical examples are: Aluminium - 45 metres per min (m/min) Mild Steel - 28m/min To calculate the lathe spindle speed (N) required to achieve the recommended cutting speed use the following formula. N = 1000 x S(m/min) p x D (mm) Where D = diameter of workpiece and 1000 is the correction factor required - cutting speed is metres/min, diameter in mm. The diameter of the finished size is usually used in this formula for all practical purposes although blank diameter or the mean of blank and finished diameter may also be used. Example: Calculate spindle speed required to turn a 30mm diameter in mild steel at the recommended cutting speed of 28 m/min. D=30 S=28 N= 1000x28 N = 297 R.P.M The amount of metal removed axially is termed feed per rev.- mm/rev or mm/rev. (see Fig 1.1.3.). Similarly to cutting speed, recommendations for feed can be found in good machining handbooks; feed/rev. must be a compromise between adequate material removal, surface finish and tangential force on the tool.
Suggested Reading: Manufacturing Engineering and Technology Kalpakjian, Schmid and Schmidt. Marks' Standard Handbook for Mechanical Engineers
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