MODEL MB-45
MODEL MB-45
Operator’s manual for Drilling Machine
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2.4 Types of a ground material
As shown on the graphs [Drawing 4] magnetic clamping force of the electromagnetic
base to the ferromagnetic ground depends on its magnetic properties. Steel with increased
carbon content and some other alloying ingredients has lower magnetic permeability, what
causes a decrease in the clamping force. Also a thickness of a work piece, on which the drill
is placed, is significant.
Maximum clamping force of the electromagnetic base to a 5mm thick work piece
surface is only about 25% of a clamping force obtained from a smooth, plane, 22mm
thick standard plate.
If such thin ground material does not bow, one can try to carry out drilling of a
hole, although with keeping the strictest precautions. Particularly a magnitude of a
pushing force on a feed handle should be very limited.
Appropriate rpm should be adjusted depending on if drilling would be carried out with
a drill bit, or with trepan type metal cutter and a metal cutter’s diameter. A drive is equipped
in mechanical 2-step reducing gearbox. A general dependence between drilling diameter and
drilling speed is shown in graphs [Drawing 5], detailed guide is supplied by manufacturer of
used drilling tools. The graph is just a general guide and the shown dependence applies to
average structural steel.
Cooling agent is fed gravitationally from a coolant bottle through an arbor to an inside
of the metal cutter. For on-a-wall and on-a-ceiling positions special cooling pastes have to be
used.
2.5 How to use the special functions
There are some factors affecting the value of the clamping force. They are as follows:
thickness of the base, presence of the paint coats, rust and other contamination, non-flat
surface, big roughness rate, extended wear out of the magnet lower surface, sort of the steel
the surface is made of.
If after turning on the electromagnet there is a problem to turn the motor on that
means the motor is working only when the green START “I” switch is on. After
releasing the button it turns off the motor that means that the system is working
properly and does not allow for operation with no suitable clamping force.
To operate this machine you should push on the main switch in position
“I”. Then you
should turn on the green button „I” to turn on the motor. To stop the motor you should push
on red button “O” (It causes the motor off, the magnet still holds). To move on the machine to
drill in another place you should stop the motor and then push on the main switch in position
“I”.
2.6 Working in difficult areas
While working in difficult access areas as well as left-
handed operator, there’s a
possibility to change location of the pinion with spoke handles to the other side of drilling
machine.
