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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)
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
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)