|
Overrunning |
|
|
Where service is
occasional and
load is steady
with no
pulsation or
fluctuation.
Where
acceleration on
starting is low
and starting
torque is less
than running
torque. |
0.8 |
|
Continuous
service, with
steady load and
gradual
acceleration.
Starting and
running loads
occasionally
surge to 10%
higher than
normal. |
1.0 |
|
Continuous
service, with
suddenly applied
additional loads
with minor
shock, and
starting torque
25% above
running torque. |
1.5 |
|
Continuously
running service,
with heavy shock
loads and high
starting torque.
Or where extreme
reliability is
desired. |
3.0 |
|
Extremely high
starting torque
loads, with
instantly
applied heavy
shock loads
and/or sudden
reverse, pick-up
loads or
jogging. |
5.0 |
|
Indexing |
|
|
Where index
angle is less
than 60°,
frequency is
less than 60
strokes per
minute and
instantaneous
acceleration
torque does not
exceed 25% of
normal torque. |
2.5 |
|
Where index
angle is between
60°and 90°,
frequency is
between 60 and
120 cycles per
minute and
instantaneous
acceleration
torque is
moderate. |
3.5 |
|
Where index
angle exceeds
90°, frequency
is above 120
cycles per
minute and
instantaneous
acceleration
torque is high. |
5.0 |
|
Backstopping |
|
|
Where loading is
occasional and
well within
rated torque. |
1.0 |
|
Where loading is
frequent, but
torque is well
within the rated
values. |
1.5 |
|
Where loading is
frequent and
subject to
overloads up to
50% of rating. |
3.0 |
|
Where loading is
subject to very
great excessive
loads. |
6.0 |
|
Adjusting |
|
|
Light load
pick-up, no
shock during
operation. |
1.0 |
|
Medium load
pick-up, minor
shock during
operation,
occasional
overloads of up
to 10%. |
2.0 |
|
Heavy load
pick-up,
moderate shock
during
operation,
occasional
overloads during
operation up to
100%. |
3.0 |
|
Sudden load
pick-up, heavy
shock or
overload in
operation. |
5.0 |
