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GE Plastics Engineering Design Calculator

Introduction

Welcome to the GE Plastics Engineering Design Calculator!

An introduction to the calculator is available. Help is also available at any time by choosing "Help" from the main menu.

List of Selected Calculations

  • Properties of Selected Material
  • Spur Gear Calculations
  • Related Information
  • All use of this system is subject to certain terms and conditions.

    Properties of Selected Material: (Contents...)

    The following sheet gives material properties used in a number of calculations. For demonstration purposes, you can get the values for a representative general-purpose ABS material.
    E        Tensile modulus (psi)                   
    G        Shear modulus (psi)                     112319.0
    nu       Poisson ratio                           
    alpha_K  Coefficient of thermal expansion (/°K)  
    alpha    Coefficient of thermal expansion (/°F)  5.22222e-05
    rho      Specific gravity                        
    rho_lb   Density (lb/in3)                        0.0379337
    sp_ht    Specific heat                           0.57336
    C_p      Heat capacity (J/kg °K)                 
    k        Thermal conductivity (W/m °K)           
    

    Available calculations:

    Help:
    Introduction to the calculator
    Mechanical:
    Beams (including snap fits)
    Plates
    Tubing
    Rotating discs
    Gears
    Press fits
    Thermal:
    Cooling time

    Spur Gear Calculations: (Contents...)

    Tooth shape:
    Number of teeth:

    Lewis form factor Y = 0.358

    D_p      Pitch diameter (in)                     2.0
    F        Face width (in)                         0.209497
    P_d      Diametral pitch (/in)                   
    P_c      Circular pitch (in)                     0.20944
    

    NOTE:All calculations assume that a full width radius is extended to the tooth root. Plastic materials are notch sensitive, and shock loading may be a concern.

    speed    Rotational speed (rpm)                  
    PLV      Pitch line velocity (ft / min)          188.496
    life     Service lifetime (hr)                   
    cycles   Number of cycles in service life        2.16e+08
    
    T        Torque (in lbf)                         
    W_b      Tangential load (lbf)                   12.0
    sigma_b  Bending stress at root (psi)            
    

    Related Information: (Contents...)

  • CAMNET Plastics Welcome Page
  • Plastics Application Design Guide
  • Design-Based Material Selection
  • Material Properties Data Base
  • All use of this system is subject to certain terms and conditions.
    kennykb@crd.ge.com