| To
Get |
Having |
Rule |
Formula |
| Diametral Pitch |
Outer diameter
and number of teeth |
Divide number of
teeth plus 1 by the outer diameter |
Pd=N+1/Do |
| Pitch diameter |
Outer diameter
and number of teeth |
Divide the
product of outer diameter and number of teeth by number of teeth plus 1 |
D=N•Do/N+1 |
| Outer diameter |
Diametral pitch
and number of teeth |
Divide the number
of teeth plus 1 by the quotient of number of teeth divided by pitch
diameter |
Do=N+1/(N/d) |
| Diametral pitch |
Internal diameter
and number of teeth |
Divide number of
teeth minus 1 by the internal diameter |
Pd=N-1/D |
| Internal diameter |
Diametral pitch
and number |
Divide number of
teeth minus 1 by |
Di=N-1/Pd |