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SAV 244 .01 / .03 / .06 /
.07 / .10 / .11
EN
3. TECHNICAL SPECIFICATIONS
3.1
Holding forces
3.1.1
Rated holding force, displacement force and pole pitch
Holding and displacement forces in magnet technology
Pole pitch, shape of the workpiece, surface quality and material have a great influence on the holding and
displacement force of a workpiece.
a)
The
holding force
is the pull-off force of a chucked workpiece perpendicular to the chucking surface.
b)
The
displacement force
is the force required for displacing a workpiece parallel to the chucking surface.
The displacement force is approx. 15 to 30 % of the holding force depending on the surface quality. It depends
on surface roughness and adhesion.
Where no further details are provided, the rated holding forces stated for our products apply to a test workpiece
made of steel 1.0037, polished, with the dimensions 100 x 100 x 40 mm.
Magnet
holding force
displacement force
Fig. 1: Holding and displacement forces on magnetic chucks
Definition of pole pitch
To achieve a uniform holding force across the entire chucking area and also chuck small workpieces, chucking
magnets are manufactured with different pole pitches and pole spacing. The chucking area is consequently
designed with alternating north and south poles. The pole gap consists of non-magnetic materials such as brass
or plastic.
N
N
N
S
S
S
pole gap
pole spacing P
Fig. 2: Definition of pole gap and pole spacing for magnetic chucks
Summary of Contents for 244.01
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