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Formsprag CSK Backstopping Clutch for Skeet Machine
A New England manufacturer of commercial skeet shooting equipment required an
overrunning clutch solution for their line of clay pigeon throwing machines. The clutch
is used as a backstop to prevent oscillation of the throwing arm after each stroke.
Stieber CSK backstopping clutches were selected over a competitor’s clutch due to
their reliability in this high-cycle application. The CSK clutch allows free rotation in the
throwing (overrunning) direction while preventing any rotation (bounce back) in the
CSK self-contained clutches feature a sprag type freewheel integrated into a 62 Series
ball bearing. Torque transmission is ensured by a press fit assembly into a rigid outer
housing with N6 tolerance, and onto a shaft with N6 tolerance.
Model CSK 25 units supplied have a 77.5 lb.ft. (105 Nm) torque capacity with a
maximum overrunning speed of 5,200 RPM. The 2.05 in. (52 mm) diameter units
are bearing supported, grease lubricated and protected against dust larger than
.012” (.3 mm) diameter.
All CSK models are equipped with ultra-hard Formchrome® sprags which provide
extra-long life, maximum wear resistance and lower maintenance costs. Formchrome
sprags — exclusive with Formsprag — are made by diffusing chromium into the
surface of hardened high carbon alloy steel to form a chromium-carbide alloy.
- Sprag type backstopping
- 77.5 lb.ft. (105 Nm)
- Formchrome® sprags
for long life