There are several things you can do to enhance the bending performance
of your Magnabend Machine.
the time that you spend doing a bend. This will help to prevent the
machine becoming hot. When the coil gets hot its resistance increases
and therefore it draws less current and thus has fewer ampere-turns and
thus less magnetising force.
the surface of the magnet clean and free of significant burrs.
Burrs can be safely removed with a mill file. Also keep the
surface of the magnet free of any lubrication such as oil.
may cause the workpiece to slip backwards before the bend is completed.
The magnet looses a lot of clamping force if there are air gaps (or
non-magnetic gaps) over one or more of the poles.
can often overcome this problem by inserting a scrap piece of steel to
fill up the gap. This is particularly important when bending
thicker material. The filler piece should be the same
as the workpiece and it should always be steel no matter what sort of
metal the workpiece is. The diagram below illustrates this:
way of getting the machine to bend a thicker workpiece is to fit a
wider extension piece to the bending beam. This will give
leverage on the workpiece, but obviously this will be no help unless
the workpiece has a sufficiently wide lip to
the extension. (This is also illustrated in the diagram
The ease with which special tooling can be incorporated with the
Magnabend is one of its very strong features.
example here is a clampbar that has been machined with a special thin
nose to accommodate the forming of a box edge on a workpiece.
(The thin nose will result in some loss of clamping force and
some loss of mechanical strength and thus may only be suitable for
lighter gauges of metal). (A Magnabend owner has used tooling
like this for production items with good results).
box edge shape could also be formed without the need for a specially
clampbar by combining basic steel sections to make the tooling as shown
on the left.
(It is easier to make this style of tooling but it is less convenient
to use compared with the specially machined clampbar).
special tooling is the Slotted
Clampbar. The use of this is explained in the
it is depicted here:
piece of 6.3 mm (1/4") thick busbar was bent on a Magnabend using a
special clampbar with a rebate milled thru it to take the busbar:
Clampbar for bending copper busbar.
There are a myriad of possibilities for special tooling. Here
some sketches to give you the sort of idea:
using a non-attached pipe to form a curve please note the details in
the drawing below. It is most important that the parts are arranged in
such a way that the magnetic flux, represented by the dashed lines, can
pass into the pipe section without having to cross a significant