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Essential Formulas for Calculating Spur Gear Cutting Data

This guide focuses on calculating cutting data for a spur gear with 60 teeth and a 5 diametral pitch. It outlines the necessary formulas and their applications for key measurements including whole depth, chordal thickness, chordal addendum, pitch diameter, and circular thickness. By filling in a cutting data table with the given information, you will learn to synthesize critical gear dimensions and enhance your understanding of involute tooth forms. Follow the structured approach to ensure accurate calculations step by step.

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Essential Formulas for Calculating Spur Gear Cutting Data

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  1. Solving for A Cutting Data Table Which Formula Should I Use?

  2. What is In a Cutting Data Chart

  3. Sample Problem • A Spur Gear has 60 Teeth of 5 Diametral Pitch. • Look at the Cutting Data Table and place the Information Into it

  4. Fill In the Table & Determine What Formulas are Needed for the Rest • Number of Teeth 60 • Dia. Of Pitch 5 • Tooth Form Involute • Whole Depth • Chordal Thickness • ChordalAddendim • Pitch Diameter • Circular Thickness

  5. Number of Teeth 60 • Dia. Of Pitch 5 • Tooth Form Involute • Whole Depth 2/P • ChordalThickness D sin (90/N) • ChordalAddendim a + ½ D[1-cos(90/N) ] • Pitch Diameter N/P • Circular Thickness ∏ D/N

  6. NEXT • Complete the Calculations in an Order That Works For You

  7. Place Information Into The Table • Number of Teeth 60 • Dia. Of Pitch 5 • Tooth Form Involute • Whole Depth .4 • ChordalThickness .225 • ChordalAddendim .3141 • Pitch Diameter 12 • Circular Thickness .2618

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