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5.4 Installation and change of the drilling unit.
The radial drill is mainly used in drilling. How to clamp the drilling bit is therefore
very important. Generally, drilling bits divides into two kinds, one is straight handle
drilling bit, and another is tapered handle one. (as fig. A). Their clamping is very
different. The straight handle one is fixed by a drilling head while the tapered handle
one is
fixed by a bushing.
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