Machining holes with guide sleeves
Figure 1 shows the rear shell of the regulator produced by our factory. The thread precision and size requirements of the upper speed screw sleeve mounting hole are high. In the past, the flipping jig was used on the rocker drill. The quick-change drill sleeve was used as the guide to machine the threaded bottom hole in three steps. First, the φ14mm hole was machined from the twist drill, and then the φ20.5mm twist drill was used to ream the hole. Finally, φ25mm The twist drill chamfers the hole, the effect is not ideal, not only the process, the fixture is cumbersome and complicated, and a small part of the thread bottom hole is out of roundness
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