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Machining Equations (Turning)

Machining Equations (Turning)

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Example from Book (p685)Example from Book (p685)

z A 6-in long, 0.5 in diameter 304 stainless-steel rod is being reduced in diameter to 0.48 in by turning on a lathe. The spindle rotates at N=400 rpm , and the tool is traveling at an axial speed of 8 in/min. Calculate, the cutting speed, material removal rate, cutting time, and power.

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Revisit TerminologyRevisit Terminology

z Independent Variables Material

(machinability) Cutting tool Speed (sfpm) Depth of cut (in) Feed (ipr or ips) Cutting environment

z Dependant Variables Metal removal rate Cut time Horsepower Temperature Surface finish

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Turning FormulasTurning Formulas

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Turning OperationTurning Operation

Figure 23.3 Schematic illustration of the basic turning operation, showing depth-of-cut, d; feed, f; and spindle rotational speed, N in rev/min. Cutting speed is the surface speed of the workpiece at the tool tip.

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Turning Turning

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Understanding FormulasUnderstanding Formulas

z (in class)

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Feeds & Speeds for Tool MaterialsFeeds & Speeds for Tool Materials

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Turning Feeds & SpeedsTurning Feeds & Speeds

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Energy RequirementsEnergy Requirements

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Cut EnvironmentCut Environment

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SolutionSolution

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SolutionSolution

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Kennametal CalculatorKennametal Calculator

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Kennametal CalculatorKennametal Calculator

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Kennametal CalculatorKennametal Calculator

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Equations, 1Equations, 1

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Equations, 2Equations, 2

4Page 4

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Equations, 3Equations, 3

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Equations, 4Equations, 4

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Equations, 5Equations, 5