Most of these tapes are plastic shell steel tapes. They are all plastic
shell steel tape. Easy to carry is their characteristic and an advantage
of plastic shell steel tape. Many plastic shells also have anti-skid design, which is very suitable for families and carpenters.
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Improvement of margin method
To machine the workpiece shown in Figure 1 on a coordinate boring machine or milling machine, to boring d, how to ensure the margin L for the knives? According to the general method, the mandrel and the block gauge are used to perform the aligning (see Figure 1). This method has a large error, because there is always some jitter on the spindle of the machine tool. When the plug gauge is used, the gap between the spindle of the machine tool and the block gauge of each person