When machining high-precision workpiece holes in the past, due to the old machine tools, the working inner holes are small and the tolerances are small. After a single knife, even if the gauze plugs are not going down, I don’t know how much the amount is, which makes it difficult for mass production. Multi-step smooth plug gauge (see figure), by measuring the hole, you can know how much the hole has, and then enter the knife according to the margin. This is significant for mass production
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