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A leadscrew with a 7.5 mm pitch drives a worktable in an NC positioning system. The leadscrew is
\r\npowered by a stepping motor which has 200 step angles. The worktable is programmed to move a
\r\ndistance of 120 mm from its present position at a travel speed of 300 mm/min. Determine (a) the
\r\nnumber of pulses required to move the table the specified distance and (b) the required motor speed
\r\nand pulse rate to achieve the desired table speed.
There are 21 correct answers in the following multiple choice questions (some questions have multiple
\r\nanswers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each
\r\ncorrect answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and
\r\neach additional answer beyond the correct number of answers reduces the score by 1 point. Percentage
\r\non the quiz is based on the total number of correct answers.
\r\n38.1 The three components of an automated system are which of the following: (a) actuators, (b)
\r\ncommunication system, (c) control system, (d) feedback loop, (e) humans, (f) power, (g) program of
\r\ninstructions, and (h) sensors?
\r\n38.2 The three basic types of automated systems used in manufacturing are fixed automation,
\r\nprogrammable automation, and flexible automation. Flexible automation is an extension of
\r\nprogrammable automation in which there is virtually no lost production time for setup changes or
\r\nreprogramming: (a) true or (b) false.
\r\n38.3 The input/output relationship of a sensor is called which one of the following: (a) analog, (b)
\r\nconverter, (c) sensitivity, or (d) transfer function?
\r\n38.4 A stepper motor is which one of the following types of devices: (a) actuator, (b) interface device, (c)
\r\npulse counter, or (d) sensor?
\r\n38.5 A contact input interface is a device that reads analog data into the computer from an external
\r\nsource: (a) true of (b) false?
\r\n38.6 A programmable logic controller (PLC) normally replaces which one of the following in control
\r\napplications: (a) computer numerical control, (b) distributed process control, (c) humans, (d)
\r\nindustrial robots, or (e) relay control panel?
\r\n38.7 The standard coordinate system for numerical control machine tools is based on which one of the
\r\nfollowing: (a) Cartesian coordinates, (b) cylindrical coordinates, or (c) polar coordinates?
\r\n38.8 Identify which of the following applications are point-to-point and not continuous path operations
\r\n(three correct answers): (a) arc welding, (b) drilling, (c) hole punching in sheet metal, (d) milling,
\r\n(e) spot welding, and (f) turning?
\r\n38.9 The ability of a positioning system to return to a previously defined location is measured by which
\r\none of the following terms: (a) accuracy, (b) control resolution, or (c) repeatability?
\r\n38.10 The APT command GORGT is which of the following (two best answers): (a) continuous path
\r\ncommand, (b) geometry statement involving a volume of revolution about a central axis, (c) name
\r\nof the humanoid in the latest Star Wars movie, (d) point-to-point command, and (e) tool path
\r\ncommand in which the tool must go right in the next move?
\r\n38.11 The arm-and-body of a robot manipulator generally performs which one of the following functions
\r\nin an application: (a) holds the end effector, (b) orients the end effector within the work volume, or
\r\n(c) positions the wrist within the work volume?
\r\n38.12 A SCARA robot is normally associated with which one of the following applications: (a) arc
\r\nwelding, (b) assembly, (c) inspection, (d) machine loading and unloading, or (e) resistance welding?
\r\n38.13 In robotics, spray-painting applications are classified as which of the following: (a) continuous path
\r\noperation or (b) point-to-point operation?
\r\n38.14 Which of the following are characteristics of work situations that tend to promote the substitution of
\r\na robot in place of a human worker (three best answers): (a) frequent job changeovers, (b)
\r\nhazardous work environment, (c) repetitive work cycle, (d) multiple work shifts, and (e) task
\r\nrequires mobility?
\r\n
In robot programming, what is the difference between powered leadthrough and manual
\r\nleadthrough?
What is an end effector?
\r\n
How is an industrial robot similar to numerical control?
\r\n
What is an industrial robot?
\r\n
What are some of the benefits usually cited for NC compared to using manual alternative methods?
\r\n
Identify some of the non-machine tool applications of numerical control.
\r\n
What is manual data input in NC part programming?
\r\n
Why should the electromechanical system rather than the controller storage register be the limiting
\r\nfactor in control resolution?
\r\n
Explain the operation of an optical encoder.
\r\n
Under what circumstances is a closed-loop positioning system preferable to an open-loop system?
\r\n
What is the difference between an open-loop positioning system and a closed-loop positioning
\r\nsystem?
\r\n
What is the difference between absolute positioning and incremental positioning?
\r\n
What is the difference between point-to-point and continuous path in a motion control system?
\r\n
Identify and briefly describe the three basic components of a numerical control system.
\r\n
What is a programmable logic controller?
\r\n
What is a contact input interface?
\r\n
What is an actuator in an automated system?
\r\n
What is a sensor?
What is the difference between fixed automation and programmable automation?
\r\n
What is the difference between a closed-loop control system and an open-loop control system?
\r\n
What are some of the advantages of using electrical power in an automated system?
\r\n
What are the three basic components of an automated system?
\r\n
Define the term manufacturing system.
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