Discussion
Back taper in drill is a
Answer: A
Back taper is a slight decrease in diameter from front to back in the body of the drill.
A twist drill is made very slightly smaller in diameter towards the shank, along the fluted body, typically by a few hundredths of a millimetre per 100 mm. This back taper keeps the lands from rubbing on the wall of the hole behind the cutting point, reducing friction, heat and the risk of the drill seizing.
A decrease from back to front would make the drill wedge tighter as it goes deeper. The taper is on the body, where the drill is in the hole; the shank is either straight or carries a Morse taper for holding, which is a different thing.
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