Advantage and disadvantage of CNC ( untung rugi cnc )

 ADVANTAGES OF CNC MACHINES
(a) High Repeatability and Precision, e.g. Aircraft parts.
(b) Volume of production is very high.
(c) Complex contours/surfaces need to be machined, e.g. Turbines.
(d) Flexibility in job change, automatic tool settings, less scrap.
(e) Safer, higher productivity, better quality.
(f) Less paper work, faster prototype production, reduction in lead times.
(g) Easier to program.
(h) Easy storage of existing programs.
(i) Avoids human errors.
(j) Usually generates closer tolerances than manual machines.
(k) Program editing at the machine tool.
(l) Control systems upgrades possible.
(m) Option -resident CAM system at machine tool.
(n) Tool path verification.

DISADVANTAGES OF CNC MACHINES
(a) Costly setup, skilled operators.
(b) Computers, programming knowledge required.
(c) Maintenance is difficult.
(d) Machines have to be installed in air conditioned places.

 PARTS SUITABLE FOR CNC MACHINES
The following parts are usually made in practice on the CNC Machines :
(a) Aerospace equipments.
(b) Automobile Parts.
(c) Complex shapes.
(d) Electronic industry uses CNC e.g. Printed circuit board.
(e) Electrical industry uses CNC e.g. Coil winding.
(f) For small to medium batch quantity.
(g) Where the set-ups are very large.
(h) Where the tool storage is a problem.
(i) Where much metal needs to be removed.
(j) When the part geometry is so complex.
(k) The operations are very complex.
(l) For parts subjected to regularly design changes.
(m) When the inspection is required 100%.
(n) When lead time does not permit the conventional tooling manufacture.
(o) When the machining time is very less as compared to down.
(p) Where tool storage is a problem.
(q) Where repetitive operations are required on the work.