Answer / ali asgar

An NC machine is numerically controlled but has no memory
storage and is run off of the "tape" each time the machine
cycles. A CNC machine has memory storage and the program
can be stored in its control.

The NC machine was the fore-runner of the modern machine
tool industry but is seldom used in todays manufacturing
industry.

Answer / k.satyanarayana

Numerical control is a system in which the actions are
controlled by the direct insertion of numerical data at one
point and the system must be in a position to interprete at
least a part of this data.

This is the defintion given by Electroni Industries
Association.

In numerical control the programme is fed to the machine by
means of a punch tape and this punch tape has to be
recycled for each product of that batch. It does't have any
memory.

Where as in CNC (computer numerical control), the machine
is usually having an on board control with memory to store
the programme. In this also, the programme will be entered
by means of punched tape but the punched tape need not be
recycled for each product in the batch.

Answer / ram

in cnc machines we can edit
the existing programs and it
is soft driven machine tool
which had great degree of
flexibility ....but in nc
machines we cannot edit the
existing programs nd it is
nt a soft driven machine..!!

Answer / dhananjay titarmare

NC machine requires the user to program in coordinates (x,y,z)

CNC machines allows the used to import a CAD/CAM file.


To certain level Numeriacal Controlled can be done by PLC.

CNC machine almost always requires a computer.

Answer / haridas

IN NC MACHINES METRIC CONVERSION IS NOT POSSIBLE METRIC CONVERSION MEANS CONVERSION FROM ONE UNIT TO ANOTHER UNIT.BUT IN CNC WE CAN DO IT.ALSO IN NC MACHINES TOOL MONITORING IS NOT POSSIBLE BUT CNC FACILITATES THIS

Answer / deepak gupta

In cnc program storage capability than nc m/c(machines).techology cost are decreasing CNC m/c are now with in the financial reach of small manufacturing shops

Answer / dhilipan

in nc machines tools are changed manually but in cnc it is automatic

Answer / indranil roy

(1) nc has no feedback system but cnc has feedback system
(2) nc is not software-driven but cnc is software-driven
(3) nc has no editing facility but cnc has editing facility

Answer / ydna

NC machines include any automated device that executes a program using some type of symbolically-encoded input [not controlled via computer]. Examples include a music box, programmable loom machine, player piano, relay logic, analog alarm clocks, older voting machines, analog-controlled household furnaces, or mechanisms driven by cams/gears/sectors/rotors. NC machines have existed long before computers were invented, and in many cases before electricity was harnessed.

The *only* difference with a CNC machine is that a computer was added to facilitate the program and control method. CNC machines are a therefore a subcategory of NC, whereby a computer is utilized. Many types of NC machines are outdated in current-day times, and have been converted to CNC. Examples include computerized fabrication machines, PLCs, industrial robots, vehicle autopilot systems, and many others.

The type of programming method is irrevelant unless a computer is utilized. If there's a computer, it's CNC. If there is not a computer: the program is run using another method, which makes it only NC. See the above for examples of both.

Each and every automated machine that existed prior to the invention of the computer are, by definition, NC. However, many have been updated in modern times. For instance, NC-controlled milling machines were used in the production of automobiles before transistors were invented. Currently most automated mills are CNC-controlled, but it does not mean all automated milling machines are now or have always been CNC.

Answer / rajiv ranjan

Both are different on working or name

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