Factor Affecting Machined Part Quality
CNC milling produces high quality
of surface finish. Movements of co-ordinates
are controlled by computer software as programmed. All the machining parameters
–speed, feed, depth of cut, RPM, coolant cutter plays a vital role on surface
finish of machined surface. Proper selection of all these parameters as recommended
by the manufacturers is to be followed. Recommendation
of manufacturer parameters cannot be compromised at all level as the machine designed
to perform the assigned parameters. The following are the factors affecting
machine part quality:-
(a) Machine should be free from vibration.
(b) Cutter should be selected as per material and amount of
stock removal requirement.
(c) Proper speed, feed & depth of cut should be
recommended by the manufacturers of cutting tools.
(d) Recommended RPM as per material, surface area of job should
be selected.
(e) High quality of cutting coolant should be used to avoid
over heating the job.
(f) High quality of
coated inserts should
be selected to
obtain good surface quality.
(g) Dull inserts / cutters should be replaced with same
grade/make to avoid unnecessary adjustment.
(h) Percentage of working voltage RPM should be monitored. If
required necessary adjustments should be made.
Precaution While Operating CNC Milling
(a) Always be alert while machining on CNC machine.
(b) Now familiarize with a machine to attempting to set or
operate.
(c) First know all the emergency switches location before
proceeding operation.
(d) Do not press any switch/ Button key unless you know fully
about its function.
(e) Main switch should be off during cleaning of machine.
(f) Do not use compress air for cleaning.
(g) Do not use non standard tool/ holder.
(h) Check the voltage and current.
(i) Check the clamping device.
(j) Check and clean the machine.
(k) Check the position of tail stock.
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