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| GEAR FORMULA | |
| CALCULATE | FORMULA |
| DIAMETRAL PITCH (P) | P=N/PD PITCH DIAMETER (PD) AND THE NUMBER OF TEETH (N) |
| DIAMETRAL PITCH (P) | P=3.1416/P CIRCULAR PITCH (P) |
| DIAMETRAL PITCH (P) | P=(N+2)/OD OUTSIDE DIAMETER (OD) AND THE NUMBER OF TEETH (N) |
| PITCH DIAMETER (PD) | PD=N/DP NUMBER OF TEETH (N) AND THE DIAMETRAL PITCH (P) |
| OUTSIDE DIAMETER (OD) | OD=(N+2)/DP NUMBER OF TEETH (N) AND THE DIAMETRAL PITCH (DP) |
| NUMBER OF TEETH (N) | N=PD*DP PITCH DIAMETER (PD) AND THE DIAMETRAL PITCH (DP) |
| ADDENDUM (A) | A=1/DP DIAMETRAL PITCH (DP) |
| DEDENDUM (D) | D=HW-A WHOLE DEPTH (HW)AND ADDENDUM (A) |
| TOOTH THICKNESS (T) AT THE PITCH DIAMETER | T=1.5708/DP DIAMETRAL PITCH (DP) |
| WORKING DEPTH (WD) | WD=2(A) ADDENDUM (A) |
| CENTER DISTANCE ( C ) | C=(N1+N2)/2DP DIAMETRAL PITCH (DP) AND THE NUMBER OF TEETH IN BOTH GEARS |
| CENTER DISTANCE ( C ) | C=(PD1+PD2)/2 PITCH DIAMETERS OF BOTH GEARS (PD) |
| CIRCULAR PITCH (CP) | CP=3.1416/DP DIAMETRAL PITCH (DP) |
| WHOLE DEPTH (HW) FOR 20 PITCH & FINER | HW=2.2/DP+.002 DIAMETRAL PITCH (DP) |
| HELICAL GEAR | |
| CALCULATE | FORMULA |
| NORMAL D.P. (Pn) | Pn=P/cos A TRANVERSE D.P.(P) AND THE HELIX ANGLE (A) |
| NORMAL D.P. (Pn) | Pn=N/(PD X COS A) NUMBER OF TEETH (N), PITCH DIAMETER (PD) AND THE HELIX ANGLE (A) |
| PITCH DIAMETER (PD) | PD=N/(Pn X A) NUMBER OF TEETH (N), THE NORMAL DIAMETRAL PITCH (Pn) AND THE HELIX ANGLE (A) |
| OUTSIDE DIAMETER (OD) | OD=PD+(2 X a) PITCH DIAMETER (PD) AND THE ADDENDUM (a) |
| OUTSIDE DIAMETER (OD) | OD=PD+2/Pn PITCH DIAMETER (PD) AND NORMAL DIAMETRAL PITCH (Pn) |
| ADDENDUM | a=1/Pn NORMAL DIAMETRAL PITCH (Pn) |