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Powerhead production unit

Consisting of a frame or bed, electric drive motors, gearboxes , and tool spindles, these units are self-contained. Their components are available commercially in various standard sizes and capacities. Because of this inherent modularity, they easily can be regrouped for producing a different part and thus have some adaptability and flexibility. (Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, 5th Edition, page 1150)

AGV (Automated guided vehicles)

Automated guided vehicles can move workpieces a great distance,
but they lack the speed found in both robot and transfer
lines. Yet because of their ability to be programmed to different
routes, they are more flexible than transfer lines.AGV
Automated guided vehicles (which are are the lastest development in material movement in plants) operate automatically along pathways which in-floor wiring (or tapes for optical scanning) without operator intervention. This transport system has high flexibility and is capable of random delivery to different workstations.
(Sabrie Soloman, Sensors and Control Systems in Manufacturing, 2nd edition, page 250)

Payroll

The payroll area computes payments, taxes, and other deductions for
employees. It also includes reporting and paying employee tax withholdings
to government agencies. Input includes time and attendance
information and production data from plant operations. Output
includes payroll checks, labor distribution, and government reports
and payments.
(Sabrie Soloman, Sensors and Control Systems in Manufacturing, 2nd edition, page 245)

Limit switches (Contact sensors)

Switches designed to be turned ON or OFF by an object exerting pressure on a lever or
roller that operates the switch
(Sabrie Soloman, Sensors and Control Systems in Manufacturing, 2nd edition, page 411)

A limit switch is constructed much like the ordinary light switch used
in home and office. It has the same ON/OFF characteristics. The limit
switch usually has a pressure-sensitive mechanical arm. When an
object applies pressure on the mechanical arm, the switch circuit is
energized. An object might have a magnet attached that causes a contact
to rise and close when the object passes over the arm.
(Sabrie Soloman, Sensors and Control Systems in Manufacturing, 2nd edition, page 79)