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Machining Equations (Turning)

Machining Equations (Turning)

© R. Jerz 2 Mar-06

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

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.

© R. Jerz 3 Mar-06

Revisit TerminologyRevisit Terminology

Independent Variables• Material

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

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

(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

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Equations, 3Equations, 3

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Equations, 4Equations, 4

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Equations, 5Equations, 5