permanent magnetic lifters0 pages

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WEN magnetics

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WENtechnology

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8411 Garvey Drive

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Suite 117

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Raleigh, NC 27616

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Tel : 919-954-1004

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Fax: 919-954-1009

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www.wenmag.com

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Ci

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LIFTING MAGNETS

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M LX-250/500/1000/2000

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USER'S MANUAL - Metric

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READ THIS MANUAL CAREFULLY BEFORE USING THE LIFTING MAGNET

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IMPORTANT! The capacity of a lifting mag net depends on various factors which influence magnetic performance. These instructions must be carefully

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read and observed.

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FACTORS INFLUENCING CAPACITY OF LIFTING MAGNETS

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Besides weight, there are additionalcharacteristicsofthe load which must be considered to evaluate the capacity of lifting magnets. Lifting magnets use magnetic

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force to grip the load so, for this reason, the load must be composed of a magnetic material (for example, iron).

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The magnetic force is formed in lines offeree (magnetic flux) which run from the North to the South poles of the lifting magnet. Any condition which impedes or

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limits the free flow of the magnetic flux reduces the lifting capacity. There are four major factors which impede the flow of magnetic flux.

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1 The contact surface:

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The magnetic flux of the lifting magnet easily passes through iron

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but does not pass easily through air or non-magnetic materials. If a

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separation (air gap) is caused between the lifting magnet and the

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load, the magnetic flux is weakened and this reduces the lifting force.

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Oxide, paint, dirt, paper, plastic or a rough surface finish produce an

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air gap and therefore a reduction in the lifting capacity.

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2 The thickness of the load:

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The magnetic flux of the lifting magnet needs a minimum thickness

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of iron to work (the iron becomes saturated if a given flux density -

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number of lines of flux per unit volume - is exceeded).

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When the piece does not have this minimum thickness the lifting

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force is reduced.

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3 The length and width of the load:

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As the load becomes longer and/or wider, there is a tendency for it to droop

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away from the lifter creating a contact surface that is curved and not flat.

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This curvature results in an air gap between the lifting magnet and the load

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resulting in a reduction of lifting capacity, especially with thin pieces.

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When this happens the lifting force is reduced.

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4 The composition of the load:

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Low carbon steels are good magnetic conductors, for example non-alloy

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steel 0.1-0.3%C such as 1018 / A36. However, steels with high carbon

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and/or alloy contents have reduced magnetic properties and this reduces

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the lifting force. Heat treatment affecting the structure of the steel also

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reduces magnetic performance - harder steels have lower lifting force

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capacity and an increased tendency to retain residual magnetism.

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The nominal force of these lifting magnets is for non-alloy steel 0.1-0.3%C.

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INSTALLING HANDLE

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Along with this lifting magnet, a handle is supplied that must be installed

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before operation. Follow these instructions:

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- Fit the handle (1 ) in the hole (3) of the shaft of the lifter.

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- Check that the notch (2) in the handle lines up with the tapped hole

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(4) of the shaft.

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- Next insert the Allen stud (5) in the hole (4).

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Attention! Ensure that the end of the stud (5) fully engages in the notch

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(2) of the handle and secures it in place. Check that the locking shaft

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(6) protrudes from the shaft as shown and blocks the handle from

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accidental rotation.

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