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A Threaded Bar that converts radial | Lean | Lean Forum

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A Threaded Bar that converts radial

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8:34 pm
October 24, 2016


Linda

Member

posts 3

A split nut is a device commonly found on a metal
lathe and automatic feed-milling Threaded
Bar
. It consists of two halves of a threaded fixture that can be closed
around a threaded shaft or opened to slide freely along the shaft when the
halves are separated. Commonly linked together with adjusting bolts, the split
nut can be tightened to allow the threads to engage a rotating threaded rod,
thereby driving the tool holder along the lathe bed by riding on the threaded
rod. This enables the split nut to be loosened to disengage the threaded drive
rod, which allows the tool holder to be manually slid back and forth along the
lathe bed by hand.

A lead screw, or power screw as it is also known, is
a threaded bar or rod that converts radial or rotational motion into linear or
straight line motion. This is achieved by passing the threaded rodthrough a
corresponding opposite thread cut into a movable work piece as is seen in bench
vices and car jacks. When the lead screw is turned, the work piece will move up
or down the threads depending on the direction of the screw. The main difference
between a lead screw and a regular fastener such as a nut and bolt is that a
lead screw’s thread is far coarser and typically square in profile to reduce
friction.

Although a power screw works on the same principle
as a simple nut and bolt, the threads used in both applications differ
considerably. The screw thread on a bolt, for instance, is of a V profile and is
cut with a fairly fine or dense thread pitch, i.e., number of threads per inch
of bolt length. This arrangement increases the friction caused when the nut is
turned along the bolt and aids in creating a very secure locking effect when the
nut is fully tightened. The thread pitch on a lead screw is far coarser, i.e.,
less threads per inch of screw length, which creates less friction and allows
for easier and quicker turning of the screw while still producing a secure grip
when tightened. The thread profile of a power Din 934 screw is also typically square which,
although more expensive to machine, produces the highest efficiency level.

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