| 摘要 |
PURPOSE: A precision measuring device for a brake drum and a hub is provided to integrally assemble a plurality of dial gauges and mount a measuring element rotating by vertical motion on a jig for precisely and conveniently measure the roundness and flatness of the brake drum and the hub. CONSTITUTION: A precision measuring device for a brake drum and a hub includes a base(10) having a slant securing groove(12) formed at an upper end, a through hole(14) formed below the groove integrally, and a guiding pin(16) at a side, an operation shaft(90) mounted into the through hole of the base, and having a securing surface(92) to be secured in the securing groove and length control bolts(81-83) for controlling lengths of dial gauge supporting bars(71-73), and an operation part(98) mounted at a lower end of the base in communication with an air tank(99) for moving the operation shaft vertically along the through hole and rotating the operation shaft, and having an operation bar(96) screw-coupled at a lower end of the operation shaft to move vertically.
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