METROL specialize in manufacturing Tool Setters & Precision Positioning Switches

Ultra precision position Swhitches  Metrol

Defective products can be prevented by detecting workpiece floating during machining

Precision machining industry

The client is a manufacturer that produces engine parts for major automakers.
A representative of the processing department consulted us on “seating confirmation” of the work and jig during machining.

Client's Issues

The client had a trouble with defective products caused by the seating failure of the engine part when cutting the part by CNC machining center.
Cutting chips can become stuck between the workpiece and the jig, causing the workpiece to float up.
Minor uplifts of 10µm can majorly affect machining accuracy.

We received an inquiry looking for a sensor that can detect the seating of the workpiece in micron level after sales representative visited him for PR.

The main focus of the issues

  • A 10µm workpiece uplift should be detected in the machining process.

Metrol's suggestions

Metrol’s “Air Gap Sensor Short Range Detection Type” is non-contact type pneumatic sensor that demonstrates 0.5µm repeatability.
It can detect a 10µm gap between the jig and the workpiece caused by cutting chips with 0.5µm repeatability prevent defective products by stop machining automatically.

In addition, the sensor is resistant to harsh working conditions by IP67 protecive structure and enables the installation inside the CNC machine tools where cutting chips or coolant splatter.
Shortened air piping improves response speed and increases productivity.


  • A 10µm slight uplift caused by cutting chips can be detected reliably during machining.

Comment from Metrol representative

Like the cases introduced here, “Air Gap Sensors” have been continuously adopted by many industries in applications such as “seating confirmation” of the shaft in the V-shaped jig and “adhesion confirmation” in machining tire mold.
If you have any troubles with defective products due to workpiece floating, do not hesitate to contact us.

Marketing department staff

For further information about the products used in this application

Air Gap Sensor [Short range detection type]

±0.5µm repeatability!
Capable of checking the precise seating of workpieces and jigs, making ultra-accurate machining with CNC machine tools possible.


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