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Subtractive Manufacturing (Computer Numerical Control(CNC ) (Constraints…
Subtractive Manufacturing
Computer Numerical Control(CNC )
Advantages
Process is programmable
It can cut on hard-metallic material
Produce a fine surface finish
More accurate
Constraints
Work holding Device
5 axis machining center
Post-Processing needed
Limitation of cutter size
CAM Programming skill
Trained machinist
A manufacturing process in which the movement of the cutter is controlled by a NC program
Work flow
CAD -> CAM -> CNC
CAM System
Toolpath programming
Step Depth
Define how deep can the cutter plunge into the workpiece
Depends on workpiece material
Soft material allows for deeper cut and can remove material faster
Cutter need to plunge down more times for hard material due to smaller depth of cut
Parts of CNC (Desktop type)
Control Panel
Spindle unit
Cutting tool
Work table
NC Program
Consists of alpha-numerical code, or sometimes known as G code
The X,Y,Z Values in the program dictates the cutter location with respective to the work piece zero reference.