Sioux_Industrial_Catalog - page 24

Type of Job
Clutch Performance
Torque Control
Adjustable
Direct/Stall Drive
Positive Clutch
1. Free-Running – Sudden Stop
Turns easily until screw head or nut seats against a solid stop.
Resistance then builds up suddenly.
Excellent for all size
screws.
Good for all size
screws.
Close torque control is
not required.
Good for large or
medium nuts or cap
screws only.
Fair for all size screws
where close torque
accuracy is not
required.
2. Soft Pull-Up
Turns easily until screw head or nut seats, then resistance builds
up gradually through one or more turns as resilient material
compressed.
Excellent for all size
screws.
Good for most screws.
Close torque control is
not required.
Slow on large screws
with long pull-up.
Good for large and
medium size screws.
Must be adjusted to
run rather slowly for
small screws.
Good for small to
medium size screws.
Requires considerable
operator pressure on
large screws.
3. Self-Tapping in Thick Material
Increasing heavy resistance through entire travel until screw
head seats. Then either (A) gradual, or (B) sudden final build-up
resistance.
Excellent for all size
screws.
Not suitable if tapping
torque exceeds
stripping torque.
Good for most screws.
With proper operator
technique, can be
used where tapping
torque exceeds
stripping torque.
Slow on large screws.
Not recommended
unless stripping torque
is considerably higher
than tapping torque.
Good for most size
screws where stripping
torque is considerably
higher than tapping
torque.
Excellent in non-
uniform or misaligned
material.
4. Sheet Metal Screws
Resistance increases rapidly at first, then eases slightly.At the end,
it usually builds up suddenly when screw head seats.
Good for all size
screws.
Not suitable if tapping
torque exceeds
stripping torque.
Good for most screws.
With proper operator
technique, can be
used where tapping
torque exceeds
stripping torque.
Not recommended
unless stripping torque
is considerably higher
than tapping torque.
Good for all size
screws where stripping
torque is considerably
higher than tapping
torque.
Excellent when
sheets are frequently
misaligned.
5. Lock Nuts
Starts with heavy resistance that last through entire travel until
screw or nut seats. Then either (A) gradual, or (B) sudden further
build-up resistance.
Excellent for all size
screws.
Good for most screws.
Close torque control is
not required.
Good for large and
medium screws.
Must be adjusted to
run rather slowly for
small screws.
Fair for all size screws.
6. Wood Screws
Starts with small resistance that steadily increases through entire
travel with additional resistance as screw head seats.
Fair for all size screws. Good for all size
screws.
Excellent for large and
medium screws.
Must be adjusted to
run rather slowly for
small screws.
Excellent for all size
screws.
Clutch Selection Guide
ASSEMBLY |
SIOUX TOOLS INDUSTRIAL CATALOG
Clutch Selection
Positive Clutch –
Spindle will not turn with motor until operator
exerts forward pressure on spindle engaging the clutch. The
clutch ratchets when torque resistance from the fastener
overcomes the forward pressure and the jaws begin to cam apart.
Torque output of the tool is determined by forward pressure from
operator and by the cam angle of the clutch jaws. For wood, sheet
metal, and machine screws and lag bolts.
Sioux Tools is the exclusive manufacturer of three different positive
clutches; Low, Mid and High torque output. Your choice of clutch
allows you to more precisely control the amount of torque exerted
on the fastener.
Stall Drive –
Spindle is coupled directly with the output of the
motor. Final torque is reached when resistance of the fastener
overcomes the torque output of the motor. Final torque can be
influenced by air pressure and/or operator twisting the tool. For
prevailing torque or soft pull applications involving machine, wood,
or self-tapping screws.
Adjustable Clutch –
Spindle will not turn with motor until operator
exerts forward pressure on spindle engaging the clutch. When
fastener is tight, clutch will ratchet. Adjusting spring pressure will
effect final output torque. Offers consistent torque control with little
operator reaction.
Torque Control –
Motor shuts off automatically when fastener is
tight. Adjusting spring pressure changes final output torque for
critical torque requirements. Perfect for applications with little or
no prevailing torque where final torque is substantially higher than
rundown torque.
Direct Clutch –
Spindle will not turn with motor until operator
exerts forward pressure on spindle engaging the clutch. Final
torque is reached when resistance of the fastener overcomes the
torque output of the motor. Excellent stall type tool when tightening
group of fasteners without turning off motor.
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