GEARCALC in general

The GEARCALC windows version has several parts. First we have the GEARCALC wizard for the sizing of a new gear pair. Then we have three pages for the analysis of a gear pair. The input data of the wizard is independent of the data for analysis. Only if you accept the results from the wizard the data is transfered from the wizard to the analysis part of the software. All the graphics displayed are for the data for the analysis part of the software.

Usually you will start a new design in the GEARCALC wizard (see chapter 10). The wizard will guide you with several pages to get a design that suits your purpose. After accepting the result you can do further analysis on strength using the AGMA 2001/2101 page (see chapter 12), you can do a lifetime analysis using a load spectrum on the page Lifetime (see chapter 13) or an analysis for scoring or wear on the AGMA 925 page (see chapter 14).

If you want to modify the geometry afterwards you can either go through the wizard again. This can be done quickly because all the inputs are saved. Or you change the geometry directly on the AGMA 2001/2101 page, if you know what you want to change.

For the analysis there are different reports for the three pages. So you can get a geometry and strength report, a report for the lifetime calculation and also a report for AGMA 925 calculation.

AGMA 2001 is used if US customary units are selected while AGMA2101 (metric edition of AGMA 2001) is used if metric units are selected. The formula signs in this manual are given as in AGMA 2001 and in brackets behind you will find the symbols as used in the metric system.

AGMA2001 | AGMA2101 | Description | See | ||

Symbol | Units | Symbol | Units | ||

C | in | a | mm | Operating center distance | 12.5 |

C_{e} | – | K_{Hme} | – | Mesh alignment correction factor | 12.21.4 |

C_{ma} | – | K_{Hma} | – | Mesh alignment factor | 12.21.3 |

C_{mc} | – | K_{Hmc} | – | Lead correction factor | 12.21.1 |

C_{mf} | – | K_{Hβ} | – | Face load distribution factor | 12.21 |

C_{mt} | – | K_{Hα} | – | Transverse load distribution factor | 12.21.6 |

C_{pm} | – | K_{Hpm} | – | Pinion proportion modifier | 12.21.2 |

C_{H} | – | Z_{W } | – | Hardness ratio factor for pitting resistance | |

K_{m} | – | K_{H} | – | Load distribution factor | 12.21 |

K_{o} | – | K_{o} | – | Overload factor | 12.20 |

K_{v} | – | K_{v} | – | Dynamic factor | 12.22 |

K_{R} | – | Y _{Z} | – | Reliability factor | 11.2.6 |

F | in | b | mm | Net face width | 12.7 |

L | hours | L | hours | Life | 12.19 |

m_{G} | – | u | – | Gear ratio ≥ 1 | |

m_{p} | – | ε_{α} | – | Transverse contact ratio | |

m_{F } | – | ε_{β} | – | Axial contact ratio | |

N_{P } | – | z_{1} | – | Number of teeth in pinion | 12.6 |

N_{G} | – | z_{2} | – | Number of teeth in gear | 12.6 |

n_{P } | rpm | ω_{1} | rpm | Pinion speed | 12.18 |

q | – | q | – | Number of contacts per revolution | 12.25 |

P | hp | P | kW | Transmitted power | 12.17 |

P_{nd} | 1/in | Normal diametral pitch | 12.2 | ||

m_{n} | mm | Normal module | 12.1 | ||

S_{H} | – | S_{H} | – | Safety factor – pitting | 11.3 |

S_{F } | – | S_{F } | – | Safety factor – bending | 11.3 |

s_{ac} | lb/in^{2} | σ_{
HP } | N/mm^{2} | Allowable contact stress number | |

s_{at} | lb/in^{2} | σ_{
FP } | N/mm^{2} | Allowable bending stress number | |

s_{c} | lb/in^{2} | σ_{
H} | N/mm^{2} | Contact stress number | |

s_{t} | lb/in^{2} | σ_{
F } | N/mm^{2} | Bending stress number | |

ψ | ^{∘} | β | ^{∘} | Helix angle at generating pitch diameter | 12.4 |

φ_{n} | ^{∘} | α_{
n} | ^{∘} | Normal pressure angle | 12.3 |