Ferrum+Alumminium 60 kg Ferrite Core Magnetic Indicator Bases With
On / Off Switch For Lathes
These switchable magnetic base meet various applications.
Avaliable in a wide range of sizes from minium and medium to large.
Either a V-slot of flat attractive face is provide.
The face opposite to the switch face is also attractive.(YB-50A is
A magnetic base is a magnetic fixture based on a magnet that can effectively be turned "on" and "off" at
will; they are often used inoptics and metalworking, e.g., to hold a dial indicator.
The vertical post, side arm (as shown in the image at right) and
the dial indicator (not shown) are connected by two swivelling
connectors. These connectors allow free movement of the arms so
that the indicator can be presented to the work in a suitable
orientation. The magnetic base may have a "V" cut into the bottom
of the base or the back, this "V" allows the base to be attached to
a round bar such as the column of a drill press.
The base is made from two blocks of iron, with a round cavity bored through the centre. The halves are
joined together with a non-ferrousmaterial such as brass or aluminium. A round permanent magnet is inserted into the bored hole and a handle is attached to allow
easy rotation of the magnet. This act of rotation changes the
position of the magnetic field so that poles are in the two iron halves, where the iron blocks
act as keepers (on position), or completely in the non-ferrous core (off position).
In this on position the field is effectively passing across an air gap (at
the base and top). If this gap is bridged with another piece of
iron (or steel in our case) it becomes part of the magnetic field's
circuit and will be attracted with the full strength of the magnet, this
is the work we want it to do—clamping.
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