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Green is punch, red is hammer, and blue is trigger slide block. The Adell and Starrett mechanism uses a sliding block crosswise through the hammer rather than an intermediate pin. The hammer has a hole through its center that the top of the punch sits in, and holds the top of the punch centered.
A transfer punch is a punch (usually in an index set) of a specific outer diameter that is non-tapered and extends the entire length of the punch (except for the tip). It is used to tightly fit the tolerances of an existing hole and, when struck, precisely transfer the center of that hole to another surface.
A pair of tweezers-type grippers would hold the part while centering it along one axis. However, there are some disadvantages with self-centering mechanical grippers: it is possible that the gripper edges could have contact with epoxy or solder paste. In addition, extra space is required between the components to accommodate the grippers.
Self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece.
Establishing a centering mark or feature before drilling, such as by: Casting, molding, or forging a mark into the workpiece; Center punching; Spot drilling (i.e., center drilling) Spot facing, which is machining a certain area on a casting or forging to establish an accurately located face on an otherwise rough surface.
A 5-pin bowling pinsetter in use at a bowling alley in Toronto Pinsetters in operation at a bowling alley as seen from behind the lanes. In bowling, a pinsetter or pinspotter is an automated mechanical device that sets bowling pins back in their original positions, returns bowling balls to the front of the alley, and clears fallen pins on the pin deck.