| TO
GET |
HAVING |
RULE |
FORMULA |
| N |
Number
of teeth |
Given |
31 |
| DP |
Normal
diametral pitch |
11 |
| |
Normal
pressure angle |
25 |
| h |
Pitch
helix angle |
45 |
| d |
Pin
diameter |
0.15709 |
| DE |
Dimension
over pins even # of teeth |
|
| DO |
Dimension
over pins odd # of teeth |
4.07900 |
| αd |
Transverse
pressure angle |
TAN(αn)=TAN(αn)/COS(h) |
33.40320 |
| H |
Base
helix angle |
TAN
(H)= TAN (h) •COSαd |
39.85571 |
| dD |
Transverse
pin diameter |
d/COS(H) |
0.20463 |
| PD |
Pitch
diameter |
N/[DP•COS(h)] |
3.98551 |
| BD |
Base
diameter |
PD•COS(αd) |
3.32717 |
| CE |
Twice
the center distance of pin and gear even # of teeth |
DE-d |
*********** |
| CO |
Twice
the center distance of pin and gear odd # of teeth |
(DO-d)/COS(90/N) |
3.92695 |
| β |
Pressure
angle to pin center |
COS(β)=BD/CE
or CO |
32.08442 |
| INVβ |
Involute
function of b |
TAN(β)-[β(π/180)] |
0.06694 |
| INVαd |
Involute
function of ad |
TAN(αd)-[αd(π/180)] |
0.07646 |
| E |
|
π/N |
0.10134 |
| D |
|
dD/BD |
0.06150 |
| td |
Transverse
arc tooth thickness |
PD•(E+INVβ-INVαd-D) |
0.12082 |
| tn |
Normal
arc tooth thickness |
td/COS(h) |
0.08544 |