Gear Tooth Proportions: helical
Gear tooth proportions — standard dimensions and formulas for spur, helical, bevel, and worm gears per AGMA standards
| gear type | record id | formula | notes | parameter | pressure angle deg | standard | tooth form | value factor (dimensionless) |
|---|---|---|---|---|---|---|---|---|
| helical | helical_20_full_english_addendum | 1/P_n | Based on normal module m_n | addendum | 20 | english_diametral_pitch | full_depth | 1 |
| helical | helical_20_full_english_axial_pitch | pi/(P_n*sin(helix_angle)) | value_factor is for normal; divide by sin(helix_angle) for axial | axial_pitch | 20 | english_diametral_pitch | full_depth | 3.141593 |
| helical | helical_20_full_english_clearance | 0.25/P_n | clearance | 20 | english_diametral_pitch | full_depth | 0.25 |
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