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How to calculate the "spade drill" thrust?

How to calculate the "spade drill" thrust?

How to calculate the "spade drill" thrust?

(OP)
Does anybody knows or have heard about thrust calculation for spade drills? I know that spade drills requires more thrust then regular drills, but how much? For a diameter of 4" in medium carbon stell (1045, with 225 BHN, for example) how much would be the thrust? I will have to specify a machine for it.

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