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Production & Lean

Line Balancing Guide

Line balancing distributes work across stations so that each one works close to takt time without overloading anyone. This guide shows the method used on assembly lines.

By Career Plus Academy — manufacturing career development for Production and Quality professionals in India.

What it means

Line balancing assigns work elements to stations while respecting their sequence, so that station times are as even as possible. A yamazumi (stacked bar) chart is often used to visualise it.

Why it matters in manufacturing

An unbalanced line has one overloaded bottleneck and several waiting operators. Balancing increases output, reduces idle time and makes work fairer.

Step-by-step line balancing

  1. 1

    List work elements

    Break the job into small elements with observed times.

  2. 2

    Note precedence

    Record which elements must be done before others.

  3. 3

    Calculate takt

    Available time ÷ demand.

  4. 4

    Minimum stations

    Total work content ÷ takt, rounded up.

  5. 5

    Assign elements

    Fill each station up to takt while respecting precedence; draw a yamazumi chart.

  6. 6

    Check efficiency

    Line efficiency = total work content ÷ (stations × takt). Look for remaining imbalance and improvement ideas.

Practical shop-floor example

Illustrative learning example — not a client result

Example

Total work content is 320 s and takt is 90 s. Minimum stations = 320 ÷ 90 = 3.6 → 4 stations. After assigning elements, station times are 85, 82, 78 and 75 s. Efficiency = 320 ÷ (4 × 90) = 88.9%.

Common mistakes

  • Balancing on standard times that do not match reality.
  • Ignoring walking and material handling time.
  • Breaking precedence to make numbers look even.
  • Not re-balancing when demand changes.

Practical checklist

  • Work elements timed on the floor
  • Precedence documented
  • Takt calculated from current demand
  • Yamazumi chart updated
  • Efficiency calculated
  • Standard work updated after changes

Frequently asked questions

What is a yamazumi chart?

A stacked bar chart showing the work elements at each station against the takt line, making imbalance easy to see.

Can line balancing reduce manpower?

It can reveal that fewer stations are needed, but the main goal is meeting demand with even, sustainable workloads.

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