Gear Nomenclature
Gear Symbols . Used in gear design and production, below gives you an outline of some that are used.
Gear CalculatorDescription | Symbol | Units |
---|---|---|
Normal pitch on ref. cylinder | Pn | mm |
Addendum of gear ref. profile | haP | mm |
Dedendum of gear ref. profile | hfP | mm |

Description | Symbol | Units |
---|---|---|
Active root diameter | dNf | mm |
Root form diameter | dFf | mm |
Normal pitch on ref. cylinder | Pn | mm |
Normal tooth thickness on ref. dia. | sn | mm |

Description | Symbol | Units |
---|---|---|
Working transverse pressure angle | awt | ° degrees |
Base diameter | db | mm |
Reference diameter | d | mm |
Operating pitch diameter | dw | mm |

Description | Symbol | Units |
---|---|---|
Axial pitch on the reference cylinder | Px | mm |
Helix angle at reference diameter | ß | ° degrees |

Gear Standards & Quality Grades
A comparision on quality grades in some of the used gear standards.
Gear CalculatorGear Grinding Quality Comparisons | |||
---|---|---|---|
Standards | |||
DIN 3961 - 3962 | 3 | 4 | 5 |
ISO 1328 : 1995/97 | 3 | 4 | 5 |
ISO 1328 : 2013 | A3 | A4 | A5 |
AGMA 2000 | Q14 | Q13 | Q12 |
AGMA 2015 | A3 | A4 | A5 |
Gear Cutting Quality Comparisons | |||
---|---|---|---|
Standards | |||
DIN 3961 - 3962 | 6 | 7 | 8 |
ISO 1328 : 1995/97 | 6 | 7 | 8 |
ISO 1328 : 2013 | A6 | A7 | A8 |
AGMA 2000 | Q11 | Q10 | Q9 |
AGMA 2015 | A6 | A7 | A8 |
Standards | |
---|---|
Geometry | DIN 3960 ISO 21771 DIN 58405 |
Reference Profile | DIN 867 ISO 53 DIN 3972 DIN 58412 DIN 58400 |
Backlash and tooth thickness | DIN 3967 DIN 58405 ISO TR 10064-2 |
Quality | DIN 3961 - 3962 ISO 1328 : 1995/97 ISO 1328 : 2013 AGMA 2000 AGMA 2015 |
Gear blanks and centre distance tolerance | DIN 3964 ISO 10064-3 |
Rating | DIN3990 ISO 6336 |