Inspection and Quality control, 4 types of inspection, Importance of Inspection, Statistical Quality Control.

This article is about, What are Inspection and quality control in manufacturing. Also, we will cover the types of inspection, Statistical quality control, Quality control chart, etc.

In a manufacturing plant, production, and quality control are the most important process in order to make a high-quality product. Let’s have a look on-

What are Inspection and quality control in manufacturing?

Inspection is important to maintain a certain quality during the manufacturing of a product. Quality control is a process by which customer ensures receive product free from defects.

Let me explain both the term separately-

Definition of Inspection:

After manufacturing, the product is required to perform certain functions. The process of checking whether the product does so or not is called Inspection.

Inspection compares the qualities of the product with a standard product.
In other words, Inspection is a process of checking the acceptability of a manufactured product.

Objectives of Inspection:

  • Inspection separates defective components so that
  • Inspection locates defect in process or raw material which otherwise causes problems at the final stage.
  • It prevents further working on spoiled semifinished products. It helps the production to more economical.
  • Inspection detects the weak position and trouble in the weak position by checking the design.

Types of Inspection:

  1. Roving, process, patrolling or floor inspection,
  2. Fixed inspection,
  3. Key-point inspection,
  4. Final inspection.

1. Revolving Inspection:

In this type of inspection, the inspector walks around the workplace floor and checks machine to machine, samples of the work of various
The revolving inspection helps to find errors during the process and before the final product is ready. It is more effective and not need to move the product to another department for checking.

2. Fixed Inspection:

Fixed Inspection finds defects after the job has been completed.

Fixed inspection is used when inspection equipment and tools can not be brought on the workplace. In this case, work brought at the interval to check.

Advantages of fixed inspection are the number of inspectors needed is less and workers and inspectors do not come in contact with each other, thus it eliminates the

3. Key-point inspection:

A key point is a stage of production beyond which it requires an expensive operation or it may not rework. Every product has a

Inspection at key point separates and thus avoid unnecessary further expenditure on the

4. Final Inspection:

In the final inspection, the inspector checks the performance and appearance of the product before delivery.

These types of checking include destructive and non-destructive testing such as

quality control

What is Quality control?

Quality control in manufacturing is a process through which a production system ensures that

In other words, it incorporates a

An important aspect of quality control is the establishment of well defines controls. Limiting the chance of

Basic fundamentals of Statistical Quality Control:

It called


Fundamental of statistical quality control is based on the

The chance of the sample to represent the entire batch is developed from the theory of probability.

Statistical Quality Control uses 3 scientific techniques, namely,

  1. Sampling Inspection,
  2. Analysis of the data,
  3. Control charting.
Instead of inspecting all components,


As control limits are plotted, and individual observations marked on a graph paper it takes the shape of a

Thus, Inspection and quality control are the most important department in any Production unit.

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