What is numerical control (NC)?
Numerical Control: form of programmable automation in which the mechanical actions and functions of a machine tool or other equipment are controlled by a program containing alphanumeric codes
• The alphanumeric data (commands) show the relative positions between the workhead (e.g. a cutting tool) and the workpart, as well as the operating conditions to manufacture the part
• When a type of part is finished, a new program is introduced in order to manufacture a different type of part
What are the 3 basic components of NC
Which two motion control systems are existing and how can they be described?
What is the difference between absolute and incremental positioning?
In absolute positioning: the positions of the tool head are always defined with respect to a fixed reference system.
In incremental positioning: The next tool head position is defined with respect to the current tool head position
Describe an Interpolator and which methods are existing
How is computer numerical control (CNC) distinguished from conventional numerical control (NC)?
The central component of a CNC system is a dedicated microcomputer, which controls movements, calculations (interpolator) and manages the data input and output
Advantages/Features of CNC regarding NC
Define direct numerical control and advantages + disadvantages
Define Distributed Numerical Control, which two types are existing?
Where is NC most appropriate? (Check List)
Name 4 advantages + disadvantages of NC
Define what are positioning systems and the two different types which are existing
Difference an open-loop and a closed loop system
Define what an encoder is and which different types are existing
Types of words in ISO code programming :
Coordinate systems and points:
Most important ISO Codes
G40: tool path compensation cancel
G41: tool path compensation left part of the workpiece
G42: tool path compensation right part of the workpiece
Code for circular interpolation in ISO Code
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