cnc machines
TRANSCRIPT
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