Abstract
The effects of shape and dimensions of drill on the figure and accuracy in dimensions of drilled hole, drilling resistance, etc. are discussed for drilling of aluminum alloy plates with a fishtail point drill.The results obtained were as follows.Some heaps at the hole inlet and burrs at the hole outlet were produced in drilling of soft plates such as 2S and 3S, but they were not so large in height as those produced by the conventional drills. However, the worked hole surface obtained by the point drill was superior to that by the conventional drills. The drilling machinability with respect to drilling resistance, enlargement of hole diameter, heaps and burrs, etc. of hard plates such as G4 and 52S by the fishtail point drill was superior to that of soft plates such as 2S and 3S, and the machinability of 14S, 61S, etc. was arranged in medium order. Of course, there is no trouble in drilling of hard plates such as G4 and 52S with the fishtail point drill, but the conventional drills can be used for this purpose. Then, it is concluded that the fishtail point drill is not so favorable for these hard materials.
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