Gun Drills
The gun drill is a single point end cutting tool used for drilling deep holes. Theoretically, the hole depth has no limit, but the torsional rigidity of the shank is the major limiting factor. The single-tip design of the gun drill, incorporating bearing pads to support and guide the tool, forces the cutting edge to cut in a true circular pattern and maintains its position throughout the length of the hole. The pressure on the bearing areas (wear pads) and the lifting forces generated by the coolant pressure act against the radial and tangential cutting forces. To initially guide the tool, an accurate pilot hole or a pilot bush is necessary.
(Production Technology, Tata McGraw-Hill Education, p.161)
Knuckle-Joint Press
Knuckle-joint presses are customarily used for both coining and swaging because they combine high tonnage and a slow squeezing action to the workpiece rather than the sharp impact of a conventional press.
(Design for manufacturability handbook, James G. Bralla, p. 3.17)
Approach Angle
Side cutting edge angle is angle between the side cutting edge and the longitudinal axis of tool. Its complimentary angle is approach angle, which is between feed direction and side cutting edge.
(Manufacturing Processes Second Edition, J.P. Kaushish, p. 285)
Press Brake
A press brake or brake press, is very efficient bending machine. Press brakes are rated in two main categories: by tonnage and bed width. The tonnage means the amount of force, in tons, the machine can exert in bending pressure. This figure determines the thickness of metal it can bend. The bed width is the width of the overall machine. Bed width determines how wide or how long a bend the machine can perform.
(Sheet metal handbook, Ron Fournier,Sue Fournier, p. 37)
The word gun drill had been written before so choose an other word.
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