In the boring of the trampoline, the diameter of the hole is generally controlled by the test knife method, that is, the cutter head is tapped by hand, and the movement amount of the cutter head is sensed according to the experience of the operator, the dimensional accuracy of the control hole is obtained, and the machining efficiency is low. Based on the experience of many years of boring, I have summarized the following methods of knives, which are very practical and are described below. 1. Use the dial gauge quantitative control as shown in Figure 1. Use the adjusting screw to complete the expansion and contraction of the cutter body, and observe the actual value of the cutter head expansion and contraction with a dial indicator. The structure is simple and accurate.
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