Twist drills are made of
A broach has
It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed isr.p.m., then the speed of lead screw will be
The lip clearance angle should decrease towards the centre of the drill than at the circumference.
The abrasive recommended for grinding materials of low tensile strength is
A round nose tool has no back rake and side rake.
The tool life in case of a grinding wheel is the time
If the shear angle is large and the chip-tool contact area is low, then the tool life will be more.
The chamfering is an operation of
In electro-discharge machining, tool is made of
In which of the following machine, the work is usually rotated while the drill is fed into work?
In drilling brass, a drill with
The hard grade grinding wheels are denoted by the letters
The cutting speed is maximum while machining __________ with a high speed steel tool.
In twist fluted drills, chips do not move out automatically.
The carbide tools operating at very low cutting speeds (belowm/min)
The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called
Mild steel during machining produces __________ chips.
In oblique cutting of metals, the cutting edge of the tool is
The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
The cutting angle of a flat drill varies from
The plain milling machine is more rigid and heavier in construction than a universal milling machine of the same size.
The cutting force in down milling is maximum when the tooth begins its cut and reduces to minimum when the tooth leaves the work.
Tool life is generally better when
If the cutting speed is increased, then the built-up-edge
Discontinuous chips are formed during machining of
In electro-discharge machining, dielectric is used to
An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as
An operation of enlarging the end of a hole cylindrically is known as grooving.