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Air-gap
It corresponds to the space between the magnet lifter active poles and the load due to surface
roughness, oxidation, paper or painting on the load, flashings, etc.
A rusted hot laminated plate presents an air-gap between 0.1 to 0.3 mm. Surface roughness on a
piece in wrought iron can reach 0.5 mm.
Permanent magnet lifter capacity is reduced when the air-gap increases (see table in following
paragraph).
Dimensions of the load (see table in following paragraph)
Thickness and contact surface : a load too thin or a contact which doesn't cover all the active
poles surface, doesn't allow a good closing of the magnetic circuit and reduces the magnetic
force on the load.
IMPORTANT : presence of holes with large dimensions also limits the magnet lifter capacity.
Length: bending of the load due to its long length produces an air-gap.
Load horizontality
To achieve the maximum capacity of a magnet lifter, loads must be perpendicular to the active
poles surface. That is why it is necessary to find out, with a good positioning of the magnet lifter,
the best horizontal position of the load before lifting.
Kind of load
Steel type *
Low carbon content (E24-2,
S235)
St 52 (A50-2)
Stainless steel 430F
Fonte
Nickel
Stainless steel 304
WLL: working load limit
* non exhaustive list
** % regarding maximum working load limit of magnet lifter with steel with low carbon content
(like S235 steel) with a surface roughness ≤ 0,1 mm (smooth and clean manufactured surface)
and for loads dimensions which are within the parameters given the « practical tables for capacity
reduction ».
The same reduction % apply to WLL of magfor not listed in this table
M 6053 M
rev 14 – 02/2018
INFLUENTIAL FACTORS ON LIFTING CAPACITY
%
magfor II
**
100
100 %
100
96 %
96
50 %
50
45 %
45
10 %
10
0 %
0
GB
WLL (kg)
magfor II
magfor II
magfor II
300
500
1000
300
500
1 000
288
480
150
250
135
225
30
50
0
0
magfor II
magfor II
2000
3000
2 000
3 000
960
1 920
2 880
500
1 000
1 500
450
900
1 350
100
200
300
0
0
0
p. 20 / 96
magfor II
5000
5 000
4 800
2 500
2 250
500
0
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