PACIFIC CONVEYORS LTD.
STANDARD PRODUCT CATALOGUE
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|Technical Page 2 HORSEPOWER CALCULATIONS The Basic Principles|
is a measure devised by 19th century manufacturers of steam engines (literally
"engineers") to compare the
horses and pit ponies. It was determined that horses of that era could, on average,
elevate a weight of 330 lbs.
by a height of 100 feet,
in a time of one minute.
words, a horse could
perform work at a rate of 330 x 100 (33000)
foot pounds per minute.
conveyors do not elevate loads, but merely carry them
from one location to another. In this case, the resistance
to motion is
the weight of the load itself, but rather the friction generated by that weight.
generated between two objects is determined by the
weight of the moving object, and by the
coefficient of friction. (Or friction factor -
which covers rolling as well as sliding objects)
elevating conveyors do not always operate vertically,
carry the load up an incline plane.
In addition to its burden, a horse must also be able
to bear its own
up the hill.
In the same way, your conveyor must have the
operate its own moving components.
loads, and packages which rub against guides.
Contingency factors. Every calculation should contain a contingency factor to allow for occasional temporary overloads. It easy enough, given the low cost of low and fractional horsepower drives, to simply overpower your system. But your electrical controls contain a thermal overload which will trip the motor in the event of a jam or stall. This device not only protects the motor, it also protects from harm your product, your personnel, and other components in the system. Do not oversize the motor to the extent that this safeguard becomes useless. The following calculations include suggested contingency factors.
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