jackscrew


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jackscrew:

see screwscrew,
simple machine consisting essentially of a solid cylinder, usually of metal, around which an inclined plane winds spirally, either clockwise or counterclockwise. It is used to fasten one object to another, to lift a heavy object, or to move an object by a precise amount.
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jackscrew

[′jak‚skrü]
(mechanical engineering)
A jack operated by a screw mechanism. Also known as screw jack.
The screw of such a jack.

jackscrew

A jack in which a screw is used for lifting; carries a plate which bears on the load.

jackscrew

jackscrew
A jack operated by a screw mechanism. Normally, it is used for raising light aircraft and lighter loads. Also known as a screw jack.
References in periodicals archive ?
Alaska Airlines has said the jackscrew failed because of extreme wear caused by a kind of grease recommended by Boeing.
Cutting Oil Improves Machining Of Stainless Steel Jackscrew
Alaska Airlines grounded 17 of its 34 MD-80 aircraft late last week in order to conduct inspections of the aircraft's jackscrew with a tool made by Boeing Co, the US aircraft manufacturer.
To counter this potential bending, use an indicator on the top face of the part when installing the jackscrew.
A draft report to be considered today by the National Transportation Safety Board blames insufficient lubrication for excessive wear and eventual failure of the MD-80's jackscrew, which helps move the plane's stabilizer and sets the angle of flight.
Early evidence points to a worn jackscrew mechanism, which would have given the pilots less control of the stabilizer.
The National Transportation Safety Board recently concluded that a lack of grease on a jackscrew assembly controlling the tail-mounted horizontal stabiliser caused the crash.
Against the aircraft and parts manufacturers, the suits allege they were negligent in failing to properly and adequately warn against the defective and unreasonably dangerous conditions of this MD-83 aircraft and its component parts, including, among others, the jackscrew and gimbal nut in the horizontal gimbal stabilizer, which malfunctioned during the flight.
carriers inspect all MD80s and DC-9s in their fleets to ensure the integrity of the jackscrew assembly in the horizontal stabilizer mechanism.
According to the National Transportation Safety Board (NTSB), the MD-80 series aircraft's two-foot jackscrew failed, causing the stabilizer to jam.
14 /PRNewswire/ -- Dallas-based Legend Airlines today announced it has inspected all of its DC-9 aircraft and found no discrepancies with the stabilizer jackscrew.
They are available with latches, jackscrews or jackscrew board mounts and can be used reliably with pick-and-place equipment.