Test4 studyguide - Chapter 39 Numerical Control and...

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Chapter 39 Numerical Control and Industrial Robotics Numerical Control -form of programmable automation in which the mechanical actions of a piece of equipemt are controlled by a program containing coded alphanumeric data. o What is Numerical Control o History- John Parsons and Frank Stulen at Parsons Co. in Michigan in 1940’s o Components of an NC system -1)part program2)machine control unit3)processing equipment o Coordinate Systems and Motion Control o 1 Point-to-point vs. 2 continuous path systems- 1-move workhead to a programmed location with no regard for path taken to get to location. 2-provides continuous simultaneous control of more than one axis, thus controlling the path followed by the tool relative to the part. o 1 Absolute vs. 2incremental positioning 1-workhead locations are always defined with respect to origin. 2-next workhead position is defined relative to present location o NC Positioning Systems o Motion hardware components -workstations, material handlilng system, central control computer. o 1 Open vs. 2 closed loop systems; feedback -1uses a stepping motor to rotate the leadscrew. 2-uses servomotors and feedback measurements to ensure desired position. o Programming- Manual part programming, computer assisted part programming, CAD/CAM assisted part programming, manual data input o Non-machining applications -1)tape laying machines and filament winding machines for composites 2)welding machines 3)component insertion machines in electronics assembly 4)drafting machines 5)coordinate measuring machines for inspection. o Benefits of numerical control - reduce nonproductive time, lower manufacturing lead times, simpler fixturing, greater manufacturing flexibility, improved accuracy, and reduced human power. Industrial robotics o Definition of industrial robot -general purpose programmable machine peossessing certain anthropomorphic features. o Robot anatomy Joints and links -provides relative movement between two parts of the body. Arm & body functions -moves to cover all axis Wrist functions - simple handling and assembly tasks involving vertical motions. Not always at the end of the arm. o End effectors -special tooling that connects to the robots wrist end to perform a specific task. o Robotic motion control categories (limited sequence, etc.) -limited sequence, playback with point to point, playback with continuous path, intelligent control.
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