© R. Jerz 1 Mar-06
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
© R. Jerz 4 Mar-06
Turning FormulasTurning Formulas
© R. Jerz 5 Mar-06
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.
© R. Jerz 6 Mar-06
Turning Turning
© R. Jerz 7 Mar-06
Understanding FormulasUnderstanding Formulas
(in class)
© R. Jerz 8 Mar-06
Feeds & Speeds for Tool MaterialsFeeds & Speeds for Tool Materials
© R. Jerz 9 Mar-06
Turning Feeds & SpeedsTurning Feeds & Speeds
© R. Jerz 10 Mar-06
Energy RequirementsEnergy Requirements
© R. Jerz 11 Mar-06
Cut EnvironmentCut Environment
© R. Jerz 12 Mar-06
SolutionSolution
© R. Jerz 13 Mar-06
SolutionSolution
© R. Jerz 14 Mar-06
Kennametal CalculatorKennametal Calculator
© R. Jerz 15 Mar-06
Kennametal CalculatorKennametal Calculator
© R. Jerz 16 Mar-06
Kennametal CalculatorKennametal Calculator
© R. Jerz 17 Mar-06
Equations, 1Equations, 1
© R. Jerz 18 Mar-06
Equations, 2Equations, 2
© R. Jerz 19 Mar-06
Equations, 3Equations, 3
© R. Jerz 20 Mar-06
Equations, 4Equations, 4
© R. Jerz 21 Mar-06
Equations, 5Equations, 5