GE Plastics Engineering Design Calculator

Introduction

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: (Contents...)

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: 14½° Involute/Cycloidal 20° Full Depth Involute 20° Stub Tooth Involute 20° Internal Full Depth (Pinion) 20° Internal Full Depth (Gear)
Number of teeth: 12 13 14 15 16 17 18 19 20 21 22 24 26 28 30 34 38 43 50 60 75 100 150 300 Rack

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

• For safe torque limit for the life of the gear, enter one of the measures of service life, obtain the material's fatigue limit for the computed number of cycles, apply an appropriate safety factor, and enter the factored fatigue limit as bending stress.
• For maximum stall torque, enter the material's flexural yield strength as the bending stress.
• For stress analysis, enter applied force or torque and read the resulting stress.

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...)