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
Point angle
Chisel edge angle
Lip clearance angle
Correct Answer :
A. Helix or rake angle
Related Questions
Threading is an operation of
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface
The aluminium oxide abrasive is chiefly used for grinding
High speed steel
Carbon steel
Wrought iron
All of these
The type of tool used on lathe, shaper and planer is
Single point cutting tool
Two point cutting tool
Three point cutting tool
Multipoint cutting tool
The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon
Work material
Tool material
Working conditions
Type of chip produced
In Oxyacetylene gas welding, temperature at the inner cone of the flame is around
3500⁰C
3200⁰C
2900⁰C
2550⁰C
In which type of welding a gas shield, a consumable electrode is used and the welding can be done in all positions.
ARC welding
Submerged ARC welding
TIG welding
MIG welding
The negative rake is usually provided on
High carbon steel tools
High speed steel tools
Cemented carbide tools
All of these
Ceramic tools are fixed to tool body by
Soldering
Brazing
Welding
Clamping
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
Point angle
Chisel edge angle
Lip clearance angle
The tail stock set over method of taper turning is preferred for
Internal tapers
Small tapers
Long slender tapers
Steep tapers
The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
Ceramic
Stellite
Diamond
Cemented carbide
The cutting speed is minimum while machining _________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
In centreless grinding, the surface speed of regulating wheel is
5 to 15 m/min
15 to 60 m/min
60 to 90 m/min
90 to 120 m/min
The effect of setting a boring tool above centre height leads to
Increase in the effective rake angle and a decrease in the effective clearance angle
Increase in both effective rake angle and effective clearance angle
Decrease in the effective rake angle and an increase in the effective clearance angle
Decrease in both effective rake angle and effective clearance angle
In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰⁰²⁰ mm. The maximum possible clearance in the assembly will be
10 microns
20 microns
30 microns
60 microns
If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is
Conical locator
Cylindrical locator
Diamond pin locator
Vee locator
The process of removing metal by a cutter which is rotated against the direction of travel of workpiece, is called
Up milling
Down milling
Face milling
End milling
A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
120
170
180
240
In a plain milling machine, the table can be moved
Longitudinally
Crosswise
Vertically
All of these
Side relief angle of a single point tool is the angle
By which the face of the tool is inclined towards back
By which the face of the tool is inclined sideways
Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
The factor which affects the tool life is
Tool geometry
Cutting speed
Feed rate
All of these
Hardness of green sand mould increases with
Increase in moisture content beyond 6 percent
Increase in permeability
Decrease in permeability
Increase in both moisture content and permeability
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
Cutting speed
Feed rate
Shear angle
Tool geometry
In metal cutting operations, the shear angle is the angle made by the shear plane with the
Direction of the tool axis
Direction of tool travel
Perpendicular to the direction of the tool axis
Central plane of the workpiece
The high cutting speed and large rake angle of the tool will result in the formation of
Continuous chips
Discontinuous chip
Continuous chips with built up edge
None of these
The chamfering is an operation of
Bevelling the extreme end of a workpiece
Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Enlarging the end of a hole cylindrically
Crater wear is mainly due to the phenomenon known as
Adhesion of metals
Oxidation of metals
Diffusion of metals
All of these
In electro discharge machining, tool is made of
Brass
Copper
Copper tungsten alloy
All of these
The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are
1, 2, 2
1, 2, 4
2, 3, 4
2, 4, 4
Low helix angle drills are preferred for drilling holes in
Plastics
Copper
Cast steel
Carbon steel