ActionJac™ Worm Gear Screw Jack systems are ruggedly designed and produced in standard models with load handling capacities from ¼ 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.
The jack housings are made of ductile iron and proportioned to support the rated capacity of the unit. MJ, ¼ ton, and ½ ton models have aluminum housings.
Each ActionJac™ Worm Gear 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 MJ, ¼, ½, and 1 ton units). The drive sleeve is supported on antifriction tapered roller or ball thrust bearings. Rotation of the drive sleeve causes the lifting screw to translate or rotate, depending upon jack configuration.
Ball Screw Jacks
ActionJac™ Ball Screw Jacks use a ball screw and nut 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. 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. (See Image 1 in Figure 1 Below).
Machine Screw Jacks
ActionJac™ Machine Screw Jacks incorporate the use of an Acme Screw with a thread form of 2C. With the use of gear ratios of 20:1 or greater, the jacks can be considered to be self locking. Because the drive sleeve includes the acme thread form, it is possible to have an anti-backlash option. (See Image 2 in Figure 1 Below).
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 300 Series Stainless Steel materials. These jacks use a stainless steel worm with a high strength bronze drive sleeve. 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. (See Image 3 in Figure 1 Below).
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 as well. (See Image 4 in Figure 1 Below).
Metric Trapezoidal Screw Jacks
ActionJac™ Trapezoidal Screw Jacks utilize the same rugged design as 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 can be supplied with IEC motor mounts. (See Image 5 in Figure 1 Below).
ActionJac™ Cubic Ball Screw and Machine Screw Jacks meet international Cubic Jack versatile mounting standards. Mounting versatility is further increased with the provision for trunnion mounting that is integral to the Cubic Jack housing. Housings are made from high quality, corrosion-resistant aluminum. Cubic Jacks are capable of directly mounting a wide array of motors and gear reducers. Available in true metric and inch execution. (See Image 6 in Figure 1 Below).Figure 1