121.
In a CNC milling machine, a circular cutter is always produced, by
A
by operators skill and experience
B
by copy milling
C
by combine motion of feed axis
D
none of the above
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In a CNC milling machine, a circular cutter is always produced, by
by operators skill and experience
by copy milling
by combine motion of feed axis
none of the above
In a CNC machining centre, any complex cutting motion involving X, Y and Z moments is carried out by
Use of jigs, cams, templates and tracers
skill of the machine operator
combinations of movements obtained from motors along the axis
none of the above
Holes are to be drilled on the circumference of a circle with regular angular spacing. If a CNC machine is used it should essentially
Have one indexing head mounted on the machine table
Have a CNC rotary axis of motion to rotate the table, about Z-axis (inaddition to X, Y and Z axes of rotation)
Be a CNC milling machine with contouring control
none of the above
For milling a bilaterally symmetrical 2-D profile on metal plate 10 millimetres thick, a CNC milling machine would require the following accessory or attachment
Copy milling attachment
Dividing head
Reversing table
none of the above
The main advantage of computer numerical control over conventional automatic control which is referred to sometimes as fixed automation is
CNC is stylish while automatic conventional control is not
CNC allows for application of higher cutting speeds and feeds
CNC is applicable in unmanned satellites
CNC offers higher flexibility than conventional automatic control (fixed automation)
CNC machining has the following main advantage over conventional machining practice
ability to employ higher cutting speeds, feeds and depth of cut
feedback control
flexibility
none of the above
CNC is not applicable in
Drilling machine
Milling machine
Lathe
none of the above
A machine will be said to have CNC control if
The dimensions of the work piece are measured by sensors while cutting is going on
The tool motion is guided by drum cams and disc cams
the loading and unloading of the work piece ON and OFF the machine respectively is made automatic
control is achieved by employment of alphanumeric data
A CNC milling machine would have
Point-to-point open loop control only
Point-to-point closed loop control only
Countering control
none of the above
A CNC machine tool has a continuous part control both linear and circular along X, Y, Z and control of table rotation about X axis and Z axis, so the machine should be called
2C, L
3L, 2C
5C
none of the above
A CNC machine find widest applications in the field of
small lot and batch production
Mask production
Nonconventional machining
none of the above
Woods greatest commercial importance is in
making paperboard and cardboard.
furniture, cabinetmaking, and building construction.
engineered wood production.
production of synthetics and plastics.
Wooden parallel clamps from 6 to 20 inches long are called
pipe clamps.
C-clamps.
hand screws.
bar clamps.
While making a cut, the blade of the saw extends into a slot in the
kerf board.
fence.
angle indicator.
turntable.
Which type of gloves should be worn when working with sharp edges and rough materials?
lightweight cotton
leather or thick fabric
rubber
plastic
Which sander is most useful for getting into hard-to-reach places?
oscillating spindle sander
stationary disc sander
stationary belt sander
narrow belt sander-grinder
Which of the following would not be found on a bill of materials?
rough size of each wood part
fasteners
accessories
finished size of each wood part
Which of the following is usually not cut with a plunge router?
edge
mortise
rabbet
dado
Which of the following is used to cut irregular shapes?
compass saw
backsaw
dovetail saw
ripsaw
Which of the following is not used as a marking tool?
utility knife
scratch awl
triangle
lead pencil