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Feeler gauge

technology Maturity 11-13 Next article →

A feeler gauge is a helpful tool. It measures the width of a tiny gap. Engineers use it to find clearance between two parts. Clearance is the small space between objects. This tool is very important in engineering work. It helps make sure parts fit just right.

Thickness gauge
Thickness gauge

How does this tool work? It uses small strips of metal. These strips are called leaves or blades. Each blade has a specific thickness. You can see the measurement marked on each piece. Some blades are parallel. This means they stay the same width. Other blades are tapered. A tapered blade gets thinner at one end.

feelers
feelers

You can use these blades in many ways. You might need a size that is not on one blade. You can stack several blades together. This helps you find an intermediate value. Some sets use wires instead of flat blades. These wires have a specific diameter. They help set the gap in spark plugs. You move the parts until the wire just fits.

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

There are many types of these sets. Most are made of stainless steel. Some sets include a single blade made of brass. This is for historical reasons. Old electronic ignition systems needed a non-ferrous metal. Non-ferrous means the metal does not contain iron. This helped set the gap between a reluctor and a pickup part.

Thickness gauge
Thickness gauge

Many people use these gauges every day. You might see them used on a DOHC engine. A worker might measure the valve clearance. They check the space between a camshaft and a tappet. One example is 0.004 inches. That is about 0.10 mm. You might find imperial sets or metric sets. Imperial sets use thousandths of an inch. Metric sets use hundredths of a millimeter.

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