Conventional twist drill bits in a hand drill, where the hole axis is not maintained throughout the operation, have a tendency to smear the edges of the hole through side friction as the drill bit vibrates.
42.
Using an ordinary two-flute twist drill bit to enlarge the hole resulting from a casting core will not produce a clean result, the result will possibly be out of round, off center and generally of poor finish.
43.
The pilot drill may be a standard twist drill, another type of drill bit appropriate for the material, or, when the primary purpose is precisely locating a hole, may be made with a short, stiff center drill.
44.
For twist drill bits, the pilot size is usually selected to so that the chisel point of the larger drill does not need to remove any material, which reduces the chance of splitting the web of the bit.
45.
His design of twist drill was attached to the rock by making two holes, which acted as anchorages, and pressure of 2 to 3 tons was applied, which enabled a hole to be drilled in under two minutes.
46.
"Example : To make a 50 mm diameter hole with twist drill, one has to start making a pre-drilling of 10 mm, than 15 mm than 20 mm, . . . up to 50 mm slowly increasing the size of holes.
47.
In wood, the lip and spur drill bit is another solution : The centre of the drill bit is given not the straight chisel of the twist drill bit, but a spur with a sharp point and four sharp corners to cut the wood.
48.
The most common twist drill bit ( sold in general hardware stores ) has a point angle of 118 degrees, acceptable for use in wood, metal, plastic, and most other materials, although it does not perform as well as using the optimum angle for each material.
49.
The correct tool to start a traditionally drilled hole ( a hole drilled by a high-speed steel ( HSS ) twist drill bit ) is a " spotting drill bit " ( or a " spot drill bit ", as they are referenced in the U . S . ).
50.
After emigrating to the United States in 1955, Velikonja worked for the Cleveland Twist Drill Company . where he was appointed a full professor in 1979 . He delivered guest lectures at the University of Wisconsin Madison ( 1961 ), Yale University ( 1963 1964 ), University of Liverpool ( 1967 1968 ), University of California ( 1975 ), and elsewhere.
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