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CNC MACHINES
(COMPUTER NUMERICAL
CONTROL)
By
S. Hemanth
Computer Numerical Control
 Computer Numerical Control (CNC) is one in
which the functions and motions of a machine
tool are controlled by means of a prepared
program containing coded alphanumeric data.
 CNC can control the motions of the workpiece
or tool, the input parameters such as feed,
depth of cut, speed, and the functions such as
turning spindle on/off, turning coolant on/off.
Types of CNC Machines
 Horizontal Machining centre
 Vertical Machining centre
 Turning Machining centre
HMC Machine
Horizontal Machining
Centers (HMCs)
 Spindle is a horizontal orientation
 Horizontal orientation encourages
chips to fall away
 HMCs are high-precision
 Used for tight-tolerance
HMC Working Operations
VMC
Machine
Vertical Machining Centers
(VMCs)
 Spindle in a vertical orientation.
 VMCs are high-precision
 Used for tight-tolerance
VMC Working Operations
Turning Machine
Turning Machining centre
 Spindle and tool
are in horizontal
plane
 Runs two or more
spindles
 Runs 24 hours
TMC Working Operations
Favourable specks
 High accuracy in manufacturing
 Short production time
 Greater manufacturing flexibility
 Simpler fixturing
 Contour machining (2 to 5 axis machining)
 Reduced human error and effort
Unfavourable specks
 High cost
 Maintenance is difficult
 Skilled part programmer is required
CNC Machines

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CNC Machines