Automation System
One of the major benefits of using CAD in tool design is that:

None of these
there is better coordination in the materials-handling area
tool motions can be checked to see if there is interference between the tool and the object
product design represents approximately one-half the engineering costs
it simplifies the trial-and-error method

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Automation System
Direct Numerical Control means:

None of these
eliminating computers from the manufacturing process
using several computers to control one large machine
complete elimination of a need for a human operator.
using one computer to control several machines

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