2009年1月4日 星期日
ट्विस्ट Drill
a) The three major parts of a twist drill
• Flute provide rake angle , allow chip to escape ,allow oil to reach work piece.
• The land are narrow ridge along the flute that bears against the wall of hole to prevent sticking
• The lip is the cutting edge.
b Grinding too much clearance on the cutting lips of a twist drill will reduce the strength of twist drill and so the drill bit will easily break
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