806. The helix angle on a HSS twist drill for drilling cast iron is of the order of
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807. Twist fluted drills are preferred because
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808. A portable drilling machine is specified by
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809. The important purpose of flutes in a drill is that they enable the
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810. The usual value of helix angle of a drill is
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811. The point angles and clearance angles of drills depend on
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812. The rake angle of a single point cutting tool corresponds to following angle of a twist drill
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