D1
D1 Operator’s Manual
11
3.3. Control system of the electromagnetic base holding force
The drilling machine includes a holding force control system to monitor the
clamping
of
the
electromagnetic
base
to
the surface. The force value depends on several
factors, such as type, thickness, flatness, and roughness of the surface, presence of
paint, rust, or dirt, fluctuations of supply voltage, and the wear of the electromagnetic
base bottom.
If the holding force falls below a safe work value, the control system will not allow
the machine to work. Also, the system will prevent the startup of the motor
on
a
surface
thinner
than
5
mm
(3/16’’)
because
such
thickness
does
not
provide enough
holding force. In such a case, the holding force will be only about 25% of the force
attained on a standard 22-
mm (7/8’’) flat plate.
If the motor does not continue work after the green MOTOR button is pressed and
released, it means that the control circuit is working properly and preventing further
drilling because the holding force is too low. Drilling on thin plates is possible, but in
such cases the green MOTOR button must be continuously held.
3.4. Preparing
Before starting, clean steel parts, including the arbor, from anti-corrosion coating
used to preserve the machine for storage and transport.
Screw the handles into the feed shaft. To allow working in places hard to reach or
using the machine by a left-handed person, the feed shaft can be installed so that the
handles are on the opposite side of the machine.
Select
the
proper
annular
cutter
based
on the hole size desired. Next, use a clean
and dry cloth to wipe the arbor and cutter, and then
install
the
cutter into the arbor as
described before.
Place the machine on a flat ferromagnetic workpiece with the thickness of at
least 6
mm (1/4’’). The workpiece must be clean, without rust, paint, or chips that
decrease the holding force. Then, connect the machine to the power source, and set
the MAGNET switch to ‘I’ to turn on the clamping. Some types of steel are non-
ferromagnetic (do not conduct magnetic flux) and the machine is not able to clamp
onto them.
Use the safety strap to prevent the machine from falling and avoid possible injury
to the operator if the machine loses the clamping. To protect the machine, attach it to
