Based on: pitch circle and number of links from the engineer's handbook.
Input
Results
Pitch circle d₁ (small sprocket):
– mm
Pitch circle d₂ (large sprocket):
– mm
Center distance in pitches a/t:
– pitches
Number of links n (theoretical):
–
Rounded (even number, nearest):
–
Schematic Representation
Formulas used:
• Pitch circle: d = t / sin(180° / z)
• Center distance in pitches: a' = a / t
• Number of links (a' in pitches): n = 2a' + (z₁ + z₂)/2 + (z₂ − z₁)² / (39.6 · a')
Note: in practice n is chosen as an even number of links,
preferably a multiple of z₁.