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What are the parts of an edge finder?

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Labelled diagram showing the parts of an edge finder.

Probe

The probe is the working part of the edge finder. It is connected to the shank of the tool by a tension-loaded spring. The probe is the working part of the edge finder. It is connected to the shank of the tool by a tension-loaded spring.
When the probe makes contact with the edge of the part, the spring causes it to 'jump out' from the rest of the tool, indicating that the edge has been found. When the probe makes contact with the edge of the part, the spring causes it to ‘jump out’ from the rest of the tool, indicating that the edge has been found.

Shank

The shank is the main body of the edge finder. When using the edge finder, it is important to note the diameter of the shank. This is because the diameter of the shank must be compensated for after the edge of a part is located. The shank is the main body of the edge finder. When using the edge finder, it is important to note the diameter of the shank. This is because the diameter of the shank must be compensated for after the edge of a part is located.

Head

The head of the edge finder is inserted into a collet or chuck which is then mounted onto the spindle of a milling machine or drill press. The head of the edge finder is inserted into a collet or chuck which is then mounted onto the spindle of a milling machine or drill press.