Discussion
The recommended drill point angle for drilling moulded plastic is
Answer: C
The recommended point angle for moulded plastic is 75 degree.
The standard drill point angle of 118° suits general work in steel and cast iron. Soft, brittle or easily torn materials such as moulded plastics, hard rubber and fibre need a sharper (smaller) point angle, commonly in the range of about 60° to 90°, so that the drill enters gently and does not chip or crack the material. Of the options, only 75° falls in that range.
130° is a flatter point of the kind used for harder materials, and 100° is still too blunt for plastics; both would tend to grab and chip moulded parts.
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