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Subtractive Manufacturing (Computer Numerical Control (CNC) (Advantages…
Subtractive Manufacturing
Computer Numerical Control (CNC)
Advantages
The process is programmable
Able to cut on hard metallic material
Produces a smooth surface finish
More accurate
Challenges
Limitation of tool-bit (cutter diameter) size to produce small details
Post processing needed
Deciding the depth of cut (Tool-bit size)
Work holding device
Toolpath Programming
Computer Aided Design (CAD)
-Part & Assembly design
Computer Aided Manufacturing (CAM)
-Toolpath & Tool Manufacturing
Post processor & machine simulation
-Optimizes CAM toolpath & NC programme
Part machining
-NC Program drives the CNC machine
Parameter Setting
-Step depth (Soft material - deeper cuts
& removes material faster)
-Step Over (Better surface finish, longer machining time)
-Feed rate
-Roughing (Removes bulk material at a shorter time)
-Finishing (Aims to cut parts to an accurate dimension,
good surface finishing)
How CNC works
-A manufacturing process in
which the movement of the cutter,
is controlled by a NC program
CNC machining
-Pre Programmed computer
software dictates the movement
of factory tools and machinery
NC program
-Consists of Alpha-Numeric
code/ G-code
Can be generated from CAM
Manual Programming