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CHAINCALC CHAIN DRIVE SELECTION CALCULATOR

🔗 Recommended Chain ANSI 50

Pitch

15.875

Rated Power

Max Speed

RPM

Break Load

Design Power

—

Trans. Ratio

—

i = n₁/n₂

Chain Velocity

—

m/s

Chain Length

—

pitches

Actual Centre Dist.

—

Computing...

Safety Factor

—

n (min 7)

Wrap Angle

—

° (min 120°)

Sprocket Teeth

—

z₁ / z₂

Chain Drive Layout

Chain Standard (ANSI / ISO)

Chain Pitch ANSI 50 — 15.875 mm

Power & Speed Inputs

Input Power (P) 5.0 kW

0.1100200

Driver Speed (n₁) 1450 RPM

5015253000

Driven Speed (n₂) 480 RPM

5010252000

Sprocket Specification

Driver Sprocket Teeth (z₁) 19

173145

Desired Centre Distance 400 mm

10010502000

Service Conditions

Load Type Moderate Shock

Operating Hours/Day 10–16 hrs

Lubrication Type Drip / Oil Bath

Service Factor (K_s) 1.40

Load Type	8–10 h/day	10–16 h/day	16–24 h/day
Smooth	1.0	1.25	1.50
Mod. Shock	1.25	1.40	1.75
Heavy Shock	1.50	1.75	2.00

Formula Reference

RATIO i = n₁/n₂ = z₂/z₁ · z₂ = z₁ × i

DESIGN P P_d = P × K_s × K_lube · K_s = service factor

VEL v = z₁ × n₁ × p / 60000 (m/s)

LENGTH L = 2C/p + (z₁+z₂)/2 + (z₂−z₁)² × p / (4π²C) (pitches)

SAFETY n = F_break / F_working · F_w = P_d×1000/v (min n=7)

Chain Drive Calculator: Sprocket & Roller Chain Design Guide

Roller chain drives transmit power through positive engagement, no slip, exact speed ratio maintained. Widely used in conveyors, motorcycles, agricultural machinery and industrial equipment. This calculator computes chain pitch, length, centre distance and power rating for ANSI/ISO standard chains.

📋 How to Use This Calculator

Select chain pitch, ANSI 40 (½"), 50, 60, 80 or ISO equivalent.
Enter driver and driven sprocket tooth counts.
Enter centre distance (mm) and input power (kW).
View chain length (links), exact centre distance, speed ratio and chain tension results.

📐 Formula & Working Principle

Transmission Ratio i = z₂/z₁. Chain Length L = 2C/p + (z₁+z₂)/2 + (z₂-z₁)²/(4π²C/p). Chain Speed v = z₁ × p × n₁/60000 m/s. Tangential Force F = P/v.

💡 Worked Example

Sprockets: Driver 17T, Driven 51T, Pitch=12.7 mm (#40 chain), C=500 mm, n₁=1450 RPM. i=3:1. v=5.23 m/s. Chain length ≈ 120 links. Centre distance exact=498.4 mm.

❓ Frequently Asked Questions (FAQ)

Q: What is the minimum number of teeth on a sprocket?

Minimum 17 teeth on the driver sprocket, fewer teeth increase the polygon effect, noise and wear rate.

Q: How much chain sag is acceptable?

For horizontal drives, maintain sag on the slack side equal to about 2% of the centre distance. For vertical drives, keep sag to a minimum.

Q: What lubrication methods are used for chains?

Manual (below 600 RPM), drip lubrication (600–2500 RPM), oil bath (2500–7000 RPM), forced lubrication (above 7000 RPM). Choose the method appropriate for the speed.

Q: How do you check chain wear?

New #40 chain: 25.4 links = 508 mm. 3% elongation means 523 mm → replace the chain. A chain wear gauge tool allows accurate measurement.

Q: V-belt vs chain drive: when to use which?

Chain: exact speed ratio, heavy loads, high temperature. V-belt: quiet operation, slight slip acceptable, vibration damping needed.