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2.3 Considerations for Use
The WLL data is generated by testing the magnetic lifters on a flat ground mild steel plate
that has a thickness equal to or greater than that specified on the lifter data plate. This
information is also shown in Section 4 of this manual.
The optimum performance of a magnetic lifter is achieved when the pole faces are in good
condition and make intimate contact with a load of the recommended thickness.
Consideration should always be made to the size of the load (Section 4 Technical Data).
Whilst the load weight may be within the WLL of the lifter, as the unsupported area of the
load increases, natural flexing will occur due to its own weight. This could have an adverse
effect on the safety of the lift. If in doubt always use a spreader beam and multiple lifters.
There are four factors that will reduce the magnetic clamping force:
1 Air Gaps
The high magnetic forces generated by the Lifting Magnets allow the lifter to clamp
components through air gaps. However this will ALWAYS have an adverse effect on the
lifter performance. Air gaps are generated in a number of ways. For example paint, dust,
scale or even a poor surface finish constitutes an air gap. The effect of air gaps are shown
within Section 4 of this manual. These graphs demonstrate the reduction in clamping force
generated by the lifter as the air gap increases.
2 Load Thickness
Should the Lifting Magnet be used to lift plates thinner than recommended for the lifter
there will be, dependent on the material thickness, a significant drop in clamping force.
A selection of performance curves on thinner than recommended material is in Section 4
(Technical Data) of this manual.
3 Material Types
Certain materials exhibit different characteristics in their ability to carry magnetism. For
any material other than mild steel a reduction factor must be applied to calculate the
clamping force.
Typically these are as follows: -
Ferrous alloy steels 0.8
High carbon steel
Cast iron
For example, when lifting cast iron using ULE0300 lifter:
mild steel WLL
cast iron reduction factor
cast iron WLL
0.7
0.55
= 300kg x 0.55
Eclipse Magnetics. Innovative Magnetic Solutions
= 300kg
= 0.55
= 165kg
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