cnc machines
TRANSCRIPT
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CNC MACHINES
(COMPUTER NUMERICAL
CONTROL)
By
S. Hemanth
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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.
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Types of CNC Machines
Horizontal Machining centre
Vertical Machining centre
Turning Machining centre
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HMC Machine
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Horizontal Machining
Centers (HMCs)
Spindle is a horizontal orientation
Horizontal orientation encourages
chips to fall away
HMCs are high-precision
Used for tight-tolerance
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HMC Working Operations
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VMC
Machine
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Vertical Machining Centers
(VMCs)
Spindle in a vertical orientation.
VMCs are high-precision
Used for tight-tolerance
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VMC Working Operations
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Turning Machine
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Turning Machining centre
Spindle and tool
are in horizontal
plane
Runs two or more
spindles
Runs 24 hours
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TMC Working Operations
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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
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Unfavourable specks
High cost
Maintenance is difficult
Skilled part programmer is required
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