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What is CNC Machining:
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CNC, stands for Computer Numerical Control, applies to machine
control system but erroneously used as a replacement term for
NC. CNC is a generic term for vast field of numerical controllers.
Our application is related to CNC Milling; used for machining
complex parts and shapes hard to machine with conventional machines.
Firstly cutter path is generated direct from the CAD model,
which is transferred to machine controller in the form of numerical
data. This data is used to move the machine table and tool to
create the high precision jobs.
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| Advantages
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Parts
can be machined directly out of engineering plastics, ferrous
or non ferrous metals.
Suitable
for accurate and highly finished parts.
Economical
for small to medium number of parts that require wide range
of operations to be performed.
CNC
machining could be very effective even for a single job, if
part is complicated and requires lot of different operations,
if done manually.
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Disadvantages:
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Need
to spend considerable time for programming and checking before
actual machining.
Sharp
corners are not possible due to cutter radius which need to
be sharpened by secondary operation if required.
Undercuts
are not possible to machine in single setup as opposed to most
of RP processes.
Deep
and narrow pockets/slots may not be possible due to cutter size
constrains.
May
need secondary finishing operation to obtain smooth surface
and remove the cutter marks.
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Feature
Size:
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CNC friendly parts should have some radius on
all internal corners. Deep and narrow pockets should be avoided
because of small cutters can't machine deep pockets.
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Price
Factor: |
It's always cheaper and quicker to do 2D machining
compared to 3D machining. For example part with tapered walls
and angular base takes much longer to machine and program than
straight vertical walls and flat base.
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Materials:
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Please check :: CNC
specification link :: for commonly used materials for machining
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