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Feeler gauge

technology Maturity 11-13 Next article →

A feeler gauge is a specialized precision tool. Engineers use it to measure gap widths. These gaps are often called clearance. Clearance is the small space between two separate parts. Measuring this space is vital for mechanical systems. It ensures that moving components fit together correctly.

Thickness gauge
Thickness gauge

The tool consists of several small metal strips. These strips are called leaves or blades. Each blade has a specific thickness marked on it. Most blades are made from stainless steel. This material is common for its durability. The blades are flexible enough to be used together. You can stack multiple blades to find an intermediate value. This allows you to measure gaps that do not match a single blade.

feelers
feelers

There are two main shapes for these blades. Most gauges use parallel blades. These blades maintain a constant thickness along their length. Other gauges use tapered blades. A tapered blade changes in width from one end to the other. However, the thickness of the blade remains constant. Both types are used in similar ways to check gaps.

feelers
feelers

Some specialized sets use wires instead of flat blades. These are used to set the gap in spark plugs. Each wire has a specific diameter. A worker inserts the wire into the gap. They increase or decrease the gap size until the wire fits just right. This ensures the spark plug is set to the correct measurement.

XK engine inlet camshaft measuring valve clearance-0796
XK engine inlet camshaft measuring valve clearance-0796

Historically, some sets included a brass blade. Brass is a non-ferrous metal, meaning it contains no iron. This was important for early electronic ignition systems. Technicians used the brass blade to set the air gap. This gap was located between a reluctor and a pickup part. Using a non-ferrous metal prevented magnetic interference in these specific systems.

Measurement systems for these tools usually fall into two categories. One set uses imperial units. These measure in thousandths of an inch. Another set uses metric units. These measure in hundredths of a millimeter. The intervals for both systems are roughly the same order of magnitude. This allows engineers to choose the system that fits their specific project.

Thickness gauge
Thickness gauge

Feeler gauges are essential for maintaining complex machinery. For example, they are used on a DOHC engine. A technician might measure the valve clearance. This involves checking the space between a camshaft and a tappet. A common measurement might be 0.004 inches. This is approximately equal to 0.10 mm. Precise measurements like this keep engines running smoothly.

XK engine inlet camshaft measuring valve clearance-0796
XK engine inlet camshaft measuring valve clearance-0796

These tools belong to the broader field of metalworking measuring instruments. They are a fundamental part of engineering and mechanical maintenance. Without them, it would be difficult to ensure precision in small spaces. They turn the invisible distance of a gap into a known number. This precision is what allows modern technology to function reliably.

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File:Thickness gauge.jpg
Thickness gauge.jpg
File:XK engine inlet camshaft measuring valve clearance-0796.jpg
XK engine inlet camshaft measuring valve...
File:feelers.svg
feelers.svg
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