Wichita Clutch LK Brake - Manual (Page 2)

B
Air Tube Disc Clutches and Brakes
P-1100-WC 1/12 Wichita Clutch 800-964-3262 23
where this is not pos si ble, forced air
cooling may be nec es sary for
extended clutch life.
6. Safe clutch operating speeds should
be maintained in product design.
Maximum Clutch Contact Velocity
FPM Material
6,000 (Recommended cast iron
9,000
upper limit for slip)
ductile iron
12,000 steel
Dynamic balancing recommended when
peripheral speeds exceed 3500 FPM.
The maximum speeds shown are safe
op er at ing speeds based on years of
Wichita testing. Please do not exceed
these limits.
Field of Application Group A Group B Group C Group D
Pumps Centrifugal Reciprocating compressors Reciprocating compressors
compressors over 2 cylinders, one or two cylinders
centrifugal fans & blowers
Agitators Liquid Semi-solid Solids
Brick Brick press, extruder, pug mill
manufacturing
Canning & bottling machine Bottle-can feeders, filling, mixers
Engine driven equipment Crane, hoist, engine Crowd
Grinding mills Ball-rod-sag-pebble Crushers, shakers
Lumber processing Yarder Carriages, conveyers Chipper, logger
Marine Propulsion clutch CP wheel Shaft brakes, propulsion
reversing type, anchor winch
Bulk material Conveyors evenly loaded, Feeders Elevators
handling line shaft evenly loaded
Metal production & Coilers, slitters, press brake, Draw bench, rolling mill, Hammer mill, forming
metalforming non-geared press, geared press shear, back geared press, press, forging press,
deep draw press, transfer header press, knuckle press
press, toggle press
Paper industry dryer Fourdrinier to 500 FPM, Fourdrinier to 1800 RPM
sections & calenders paper mill plane & press selections, calenders
Consult factory smoothing press & dryers
Petroleum Drilling & service rig master Mud pumps,
production clutches, compound clutches, PTO clutches
rotary, drum
Rubber Transfer machines Banberry mixer, drum mixer, Centrifuge
manufacturing evenly loaded extruder, calender
This chart gives application factors
ranging from light duty (the A group) to
extra heavy duty (the D group).
After initial usage is determined, see
Clutch sizes are affected by the
following variables:
1. Machines that operate under smooth
loads require smaller clutches. These
machines are driven by either
multi-cylinder high speed engines or
electric motors with reduced starting
current.
2. Drives that require high starting
current motors will require clutches
with sufficient torque to prevent
excessive slipping while starting.
3. Starting torque may be high, which
requires a fast clutch response time
to transmit the required torque; or,
extended clutch slip time is required
to protect the prime mover.
“Selection Requirements” to com plete
the selection process. The in fla tion and
exhaust time should also be checked to
insure proper response.
4. Starting torques may be very low
compared to the normal torque,
which may result in the clutch not
being fully pressurized prior to the
time of full torque requirement. This
will cause the clutch to overheat from
slippage. Clutch inflation time in this
instance is very important.
5. Clutches on most machines are
designed to slip prior to damage
from shockloads. As a result, the
clutch may require periodic
main te nance; therefore, the clutch
should be located for easy access in
the power train.
Clutch es should also be located for
max i mum cooling air. In instances
Application Guidelines
Application Factors