Page 154 - Turner 1st sem Practicals
P. 154
• the cutting edges and angles are equal • the cutting edges are of uneven length
• the drill has produced a hole of the correct size. • the drill has produced an oversized hole.
Any looseness of the drill in the hole means (Fig 3): A drill that has been ground with uneven or too great a lip
clearance will
• tend to chatter during starting
• produce an out-of-round hole.
Producltion & Manufacturing : Turner - Exercise 1.3.42 141
