Automated Asby-3e-S 7-12, 12/06, 06/04/07
AUTOMATED ASSEMBLY SYSTEMS
Name three of the four conditions under which automated assembly technology should be considered.
: The four conditions named in the text are (1) high product demand, so that millions of units are
produced, (2) stable product design, because design changes require tooling changes in the assembly system,
(3) the assembly consists of no more than a limited number of components, say around a dozen or fewer, and
(4) the product is designed for automated assembly.
What are the four automated assembly system configurations listed in the text?
: The four configurations are (a) in-line assembly machine, (b) dial-type assembly machine, (c)
carousel assembly system, and (d) single-station assembly machine.
What are the typical hardware components of a workstation parts delivery system?
: The typical components are (1) hopper, (2) parts feeder, (3) selector and/or orientor, (4) feed track,
and (5) escapement and placement device.
What is a programmable parts feeder?
: As defined in the text, a programmable parts feeder is a feeder that is capable of feeding components
of varying geometries with only a few minutes required to make the adjustments (change the program) for the
Name six typical products that are made by automated assembly.
: The products identified in the text are alarm clocks, audio tape cassettes, ball bearings, ball point
pens, cigarette lighters, computer disks, electrical plugs and sockets, fuel injectors, gear boxes, light bulbs,
locks, mechanical pens and pencils, printed circuit board assemblies, pumps for household appliances, small
electric motors, spark plugs, video tape cassettes, and wrist watches.
Considering the assembly machine as a game of chance, what are the three possible events that might occur
when the feed mechanism attempts to feed the next component to the assembly workhead at a given
workstation in a multi-station system?
: The three possible events are (1) the component is defective and causes a station jam, (2) the
component is defective but does not cause a station jam, and (3) the component is not defective.
Name some of the important performance measures for an automated assembly system.
: The performance measures considered in the text include yield (proportion of assemblies produced
with no defective components), production rate, proportion uptime (a.k.a. line efficiency), and unit cost per
Why is the production rate inherently lower on a single-station assembly system than on a multi-station
: Because all of the work elements are performed sequentially at one station in the single station
system, whereas the elements are performed simultaneously at multiple workstations in a multi-station