If a machinist wants to drill a precise hole with minimal wandering, which twist drill feature is most critical?
Point angle
When a twist drill is fed into a workpiece, the very tip meets the surface first and decides where and how truly the hole begins.
The point angle is the included angle between the two cutting lips at the drill point, and it governs how the drill centres itself and starts cutting.
A correct, symmetrical point angle keeps both lips cutting equal amounts, so the side forces balance and the drill stays on centre instead of walking sideways.
If the point is unequal or wrongly ground, one lip cuts more, pushing the drill off line and causing the wandering the question warns against.
The margin only guides the drill after the hole is started, the flutes merely clear chips, and the shank just grips in the chuck; none of these fixes where the hole begins.
So for a precise hole with minimal wandering, the tip geometry is the deciding feature.
Hence, the answer is Point angle.
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Important Questions from Drilling and Reaming
What is the point angle of the drill used to drill copper?
The clearance angle of a drill is between ______.
What is range of drills provided on a Morse taper?
Which of the following formulas is used to calculate rpm where cutting speed and diameter are known?
The Morse standard taper is available in _______ numbers.
