Owen Lowe writes:

A fourth drilling question has sprung to mind as to drilling wood:

Given the choice of 135 degree or 118 degree (or other angles) of grind
on a drill, when do you choose one over the other?

135 degrees is used to cut high alloy steel. (HSS, M2, etc.)
For cast iron, aluminum, bronze, plastic,wood, etc. use 118

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