ActionJac MJAB-80-I 20:1

Inch Worm Gear Mini Machine Screw Jack, Inverted Anti-Backlash, 0.5 Ton Capacity, 20:1 Gear Ratio, Screw Lead 0.25" Read More
Product Specifications

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Product Specifications

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Details

Capacity [Ton]:: 0.5
Gear Ratio:: 20:1
Turns of Worm Per Inch Travel:: 80
Torque to Raise 1 lb. [in-lb]:: 0.0080
Lifting Screw Diameter [in]:: 0.50
Screw Lead [in]:: 0.250
Root Diameter [in]:: 0.332
Tare Drag Torque [in-lb]:: 1

Performance Specifications

Maximum Allowable Input [hp]:: 0.17
Maximum Input Torque [in-lb]:: 8
Compression Loading Maximum Travel at 1000 lbs. [lbs]:: 7.20
Compression Loading Maximum Travel at Any Load [lbs]:: 8.75
Maximum Worm Speed at Rated Load [rpm]:: 1310
Travel Rate at 1750 rpm [in/min]:: 22.5
Maximum Load at 1750 RPM [lb]:: 720
Starting Torque:: 2 x Running Torque

Weight

Base 0 Travel [lb]:: 2.5
Per Inch of Travel [lb]:: 0.20
Grease [lb]:: 0.5

More Details

Anti-backlash Machine Screw Jacks are used wherever reversible load conditions require precision positioning control. Adjustable backlash Machine Screw Jack models are available to reduce backlash to approximately 0.003".

An Anti-backlash Machine Screw Jack allows the lash between the drive sleeve thread and the lifting screw thread to be controlled by adjusting the top cover of the jack. The anti-backlash jack design has an upper drive sleeve and a lower drive sleeve. Adjustment of the cover changes the relative distance between the drive sleeves. This change in distance compensates for any lash. Because the drive sleeve is split, the life of an Anti-backlash Machine Screw Jack will be less.

Anti-backlash Machine Screw Jacks minimize backlash, but should not be used to completely eliminate backlash. While it may be desirable to totally eliminate backlash, the result would be a lock-up of lifting shaft and drive sleeve.