Manufacturing And Production Technology - Study Mode
[#246] Crack in grinding wheel is developed due to
Correct Answer
(D) High speed of wheel
Explanation
Solution: Crack in grinding wheel is developed due to High speed of wheel
[#247] The machining of titanium is difficult due to
Correct Answer
(C) Low tool-chip contact area
Explanation
Solution: Machining operations of titanium alloys are considered to be difficult, due to its relatively high tensile strength, low ductile yield, Low tool-chip contact area
[#248] The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
Correct Answer
(A) Helix or rake angle
Explanation
Solution: The angle formed by the leading edge of the land with a plane having the axis of the drill, is called Helix or rake angle
The rake angle is the angle of the surface of a cutting tool tip over which the removed chips flow.
The rake angle is the angle between the front or cutting face of the tool and a line perpendicular to the workpiece
[#249] The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called
Correct Answer
(C) Chisel edge angle
Explanation
Solution: The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called Chisel edge angle
It is the angle included between the chisel edge and lip of the twist drill when measuring on a plane normal to the axis.
[#250] Segmental chips are formed during machining
Correct Answer
(B) Cast iron
Explanation
Solution: Segmental Chips- It means chips become broken pieces before it departs from the cutter.
It is often happened in high brittle materials, such as cast iron or bronze.
Such as discontinuous chip caused by higher friction coefficient or higher soft ductile materials,
it means poor cutting conditions