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accurate z-axis position control of the plates. Use of the longer 3.75 in. pin provides maximum pin displacement. The featureless music wire pin is economical and widely available.A countersunk top plate hole or two-ply top plate is generally used for high-performance applications. Notice that no disassembly is required to service a pin. A variation of this fixture employs a stretchable fabric web in place of the latex, generally referred to as spandex. Under close examination, this material appears as a very fine, stretchable net. The stretchable net requires no drilling operation pins are just pressed through during the pin-loading operation. However, some stress accumulation is observed in very dense areas. 38.3.3.7 Intermediate Guide Plates in Fixtures. Early pin translator fixtures were constructed with only two plates, top and bottom. Modern fixtures add intermediate plates to speed fixture building, produce a more reliable fixture, and make the fixture determined. Determined fixtures ensure that a pin started into a fixture hole during pin loading is able to follow one and only one path through the fixture (without bending). This is required if datadriven test programs are to be used because the test program assumes a specific mapping of grid test points to product targets.The determined pin load must remain constant if the fixture is taken apart and later reloaded; otherwise, the test program will become invalid. Intermediate plates simplify and shorten the pin-loading process because each pin must fall into the intended track. Assemblers do not have to pick between several possible holes or spend time checking for misloads and/or short circuits. Determined pin loads permit the fixture software to calculate the side loads imposed on fixture plates by the combination of tilted probes in each region of the fixture, adjusting the pin-loading plan until these side loads are balanced. This prevents the fixture from collapsing sideways under compression. The intermediate plates also support finer-diameter pins, ensuring that they do not buckle under load. As density increases, holes in the various plates become more closely spaced. At some point, for a given plate stack-up, there is the risk that some pair of holes on the next plate will become close enough that a pin being loaded might fall into the wrong hole. At that density, the fixture software must add an additional intermediate plate to the design. Thus, denser fixtures generally require more plates. Fixture software should analyze the requirements of each fixture and delete unneeded plates. 38.3.3.8 Fixture Plate Spacing Techniques. Errors in the vertical (z-axis) position of fixture plates can result in pin binding. As a tilted pin travels through the plate stack-up, the hole position in each plate shifts slightly in the x and y directions, according to the amount and direction of tilt. If a plate were to be mounted either too high or too low in the plate stack-up, the drilled hole would no longer be at the correct x-y position, forcing the pin to bend in order to pass through the hole. Pins would become difficult or impossible to load; binding and friction would occur during operation. Sensitivity to this problem increases as the amount of tilt increases. Early multiplate fixtures used a plate-spacing technique referred to as post and doughnut, which had mediocre control of z-axis plate position. A long screw passed through a stack consisting of the fixture plates and thick plastic washers. The washers were drilled in the center, and the plates were drilled with corresponding mounting holes. The screw passed through all of these in turn. The thickness of a given washer determined the space between two plates. The problem was that the errors in washer and plate thickness accumulated through the stack-up.At greater pin tilts, the result was binding. It turned out that the thickness of inexpensive fixture plate material was not terribly precise. Alternative means of plate spacing have been devised in which a single molded (or machined) part is responsible for the entire fixture stack-up, and which eliminate intermediate plate thickness as an error contribution. One method is illusFIGURE 38.15 Molded trated in Fig. 38.15. spacer prevents pin binding.
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