| INCH AND METRIC WORM GEAR SCREW
JACK MODELS |
Ball
Screw Jacks
Machine Screw Jacks
Stainless Steel Jacks
Servo-Jack™ Screw Jacks
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Metric
Ball Screw Jacks
Metric Trapezoidal
Screw Jacks |
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| WORM
GEAR SCREW JACK MODELS |
ActionJac™ Worm Gear Screw
Jack systems are ruggedly designed and produced in standard models
with load handling capacities from 1/4 ton to 100 tons. They may
be used individually or in multiple
arrangements. There are no “standard” travel lengths
and each Worm Gear Screw Jack is built to specification.
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MACHINE
SCREW JACKS
The worm gear driven Machine Screw Jack incorporates an alloy steel
worm which drives a high strength bronze worm gear (drive sleeve).
The worm shaft is supported on anti-friction tapered roller bearings
with external seals provided to prevent loss of lubrication (sealed
radial bearings on the 1/2 and 1 ton units). The drive sleeve is
supported on antifriction tapered roller or ball thrust bearings.
Rotation of the drive sleeve causes the acme thread lifting screw
to translate or rotate, depending upon jack configuration.
The jack housing is made of ductile iron (MJ
models have aluminum housings, aluminum optional on one ton models)
and proportioned to support the rated capacity of the unit. The
lifting screw is made of alloy steel with a minimum tensile strength
of 95,000 psi. The threads are precision formed, typically using
Class 2-C (Centralizing) tolerances. Jack lift shaft lead tolerance
is approximately 0.004" per foot.
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BALL
SCREW JACKS
The ActionJac™ Ball Screw Jacks use the same worm gear set
arrangement as machine screw jacks. The addition of a high, efficiency
ball screw and nut reduces the required input torque to approximately
one-third the torque required for the Machine Screw Jack.
The Ball Screw Jack housing is made of ductile
iron (1/2 BSJ and 1/2 HL-BSJ jacks have aluminum housings, aluminum
optional on one ton models) and designed to support the rated capacity
of the unit. The ball screw and nut are made from hardened alloy
steel with hardened bearing balls carrying the load between nut
and screw. This rolling action reduces friction between the nut
and the screw permitting smooth and efficient movement of the load.
Because of the greater efficiency and rolling action, the ball screw
can operate at higher speeds or increased duty cycle when compared
with the Machine Screw Jack. When a Ball Screw Jack is motorized,
less horsepower is required than an equivalent size Machine Screw
Jack.
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SERVO-JACK
SCREW JACKS
A Servo-Jack™ is an ActionJac Ball Screw and Machine Screw Jack with Servomotors for greater control of acceleration, de-acceleration, travel rate and positioning accuracy than NEMA framed motors. Designed to accommodate any specified coupling and motor, a Servo-Jack™ can be delivered as a complete assembly.
- Attach a Servo Motor to an ActionJac Screw Jack
- Custom Motor Adaptors available
Ask to speak to an Application Engineer for support with your application. |
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STAINLESS
STEEL SCREW JACKS
ActionJac™
Stainless Steel Machine Screw Jacks are ideal for use in demanding
environments where corrosion resistance is required. All external
components are manufactured from 316 Stainless Steel materials. These
jacks use a stainless steel worm with a high strength bronze drive
sleeve. The worm and drive sleeve are supported by tapered roller
bearings and sealed to prevent loss of lubrication and to resist contamination.
The stainless steel lifting screw threads are precision formed to
Class 2-C (centralizing) thread profiles. Load capacities for Stainless
Steel Machine Screw Jacks range from 1,300 to 23,000 pounds. For increased
capacity, a 17-4PH hardened worm is available.
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METRIC
BALL SCREW JACKS
With over twenty-five
years of experience manufacturing precision worm gear screw jacks,
Nook Industries has expanded the ActionJac™ offering to include
metric models providing design engineers a globally accepted product.
All the efficiency advantages that come with ball screw technology
are available in ActionJac™ Metric Ball Screw Jacks. A full
line of IEC motor mounts are available. |
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TRAPEZOIDAL
SCREW JACKS
The ActionJac™
Trapezoid Screw Jacks utilize the same rugged design as the ActionJac™
Machine Screw Jacks. These true metric jacks include a lift shaft
with a special trapezoidal thread form. This thread form has been
created to stay within ISO standards yet retains the centralizing
feature of our 2C acme threads. These jacks may be assembled with
IEC motor mounts. |
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