Gear Nomenclature
Gear Symbols . Used in gear design and production, below gives you an outline of some that are used.
Gear Calculator
| Description | 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 Calculator| Gear 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 |
