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2. Wiggler (tool) - Wikipedia

   en.wikipedia.org/wiki/Wiggler_(tool)

   On the other end, a cone shape is also spring-loaded and is used to locate the center of a previously drilled hole. This style of edge finder is considered to be the most accurate, and its accuracy can be further improved through the use of a collet. In proper setups, a repeatability of 0.0002 in (0.0051 mm) or better can be obtained.

3. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   The automatic center punch mechanism has been used for a wide variety of other applications. These include Marking and starting a hole for drilling without the bit "walking" out of alignment; Letter stamp sets; Glass-breaking tools used in rescue work and a common tool for a car thief. Impact tool for hardness testing [21]

4. Punch (tool) - Wikipedia

   en.wikipedia.org/wiki/Punch_(tool)

   Center punch. A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tendency to "wander" if it does not start in a recess. A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 ...

5. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   A combination square is a multi-purpose measuring and marking tool used in metalworking, woodworking, and stonemasonry. It is composed of a rule and one or more interchangeable heads that can be attached to the rule. [1] [2] Other names for the tool include adjustable square, combo square, and sliding square.

6. Jig borer - Wikipedia

   en.wikipedia.org/wiki/Jig_borer

   Before the jig borer was developed, hole center location had been accomplished either with layout (either quickly-but-imprecisely or painstakingly-and-precisely) or with drill jigs (themselves made with painstaking-and-precise layout).

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8. Lathe center - Wikipedia

   en.wikipedia.org/wiki/Lathe_center

   A spring center is a metalworking lathe center for maintaining a cutting tool like a reamer or a tap, in axial alignment with a hole being worked on. It consists of a point backed by a spring to push the cutting tool into the workpiece.

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