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If all preparations have been done the machine can be
connected to the mains by putting the plug into the power
point. Beforehand check if the mains switch is “OFF” and
check if the turning directions is “RIGHT”. Watch the gau-
ge once more and see if the oil level has not changed and if
necessary you have to fill it till the gauge half-full. See that
there is no paper or cleaning-rag for the ventilati on ope-
nings of the motor. Check the three-jaw and see that the
basins cannot come out of the jaw.
PUT THE JAW-WRENCH ON A PERMANENT
PLACE!
Open the protection case and check the position
and tension of the belts. For running on trial the lowest tur-
ning speed has to be chosen. You may shift the front belt,
watch fig.5 and 15.
Push in the switch and have the machine turned during 20
minutes. Check regularly if the head bearings in the head-
stock and the motor do not become hot by stopping the
machine and putting a hand on both side of the headstock
and on the motor body. Immediately stop if you hear a de-
viating noise and if you feel an abnormal heath develop-
ment( more than handwarm) and first con tact your sup-
plier.
Then switch over to a higher speed and have the machine
also function a few minutes on this speed. Do this again
with a reversed turning direction. If no problems have ari-
sen, the machine is ready for use.
WORKING METHOD
Removing metal takes place by pushing under control a
chisel point or a boring point in the piece of work through
which small pieces of material - chips - are cut away. For
this the piece of work has to make a turning movement be-
tween two fixed turning points- the headstock and the tail
stock (watch fig.1) - which lie on a very precise, imaginary
line: the centerline(4). This can be turned off paral lelly to
the centerline over the whole lenght, by carrying the chisel
which has been fixed on the support(5) in a certain tempo
along the turning piece of work. This has to be done in a
straight line, with the hands or automatically with the trans-
mission(6).
For removing material of the piece of work, power is nee-
ded. This power is transmitted from the motor to an empty
shaft in the headstock: the main shaft (2). In connection
with the maximum motorcapacity the quantity material
which has to be taken - the chip thickness and the width of
chip- has to be adapted. If the number of revolutions lo-
wers too much, the starting depth or the rate of speed has
to be lowered. Otherwise there is a chance of motor dama-
ge, shorter tool life of the chisel or the chisel rupture. The
diameter of the piece of work is also influences this. If you
have a diamter of 100 mm more power is needed for cut-
ting a chip of 1 mm than at a diameter of 10 mm.
When the tail stock (8) is placed next to the centerline be-
cause of cross adjustment, an outward conical plane is tur-
ned. An extra processing possibility over the lenght axle is
cutting a screw-thread. A special chisel cuts a spiral dee-
pening in the outline of the piece of work. A part of the out-
line keeps on standing and this height difference forms the
ultimate screw-thread. Next to turning over the lenght ax-
le, the ends of a piece of work can also be processed, for
example for making them flat and straight. Short pieces of
work can be fixed at one side in a fixed turning-point, the th-
ree-jaw chuck, and on the other side be processed at right
angles to the centerline. The basins of the chuck see to
maintenance of an imaginary centerline. By having occur-
red the chisel replace ment under an angle by adjustment
of the chuck, inward and outward conical planes can be
turned. With this strain borings can also be made in level-
led surfaces. For that a drill chuck has to be bought sepa-
rately. This drill chuck with morse cone peg has to be in-
stalled in the sliding tube (7) of the tail stock. Then the gaps
can be screwn out until the desired depht, diameter and
form.
IMPORTANT:
The precision of the pieces of
work is first and particularly depen dant of ex-
pertness and experience. During turning many
factors can influence the end result, like the sort and the
condition of the chisels, the nature of the material you want
to process, the turn and starting speed, the fixation of the
piece of work, the drafting and the condition of the machi-
ne. With the MD-350 it is possible to manufacture prolon-
ged pieces of work with a big accuracy, if all circumstances
are perfect.
FOR THE BEGINNING TURNER.
During turning big powers on certain parts can be develo-
ped. If you use the machine incorrect these parts can be
damaged or deformed and wear end tear faster, even if
they have been made and designed very expertly and ca-
refully. Through this the accuracy of the machine will de-
crease strongly, which directly influences the quality and
tahe preciseness of your pieces of work. So it is important
that the apparatus is tended in an expert way. Recommen-
ded is, if you are not a skilled turner, to start with simple pie-
ces of work and to try the different possibilities of the lathe
with trial pieces of work. It is instructive to look at skilled tur-
ners, because you are not that fast a perfect turner! For pre
venting disappointments you have to become familiar with
the basic principles of turning. Turning is not for nothing a
profession. You can find referencebooks about metal wor-
king and metal turning in the library or in a book-shop. Bes-
ides model-building magazines write about this subject re-
gularly. The best is getting into possession of a, if need be
obsolete, technical text-book. In this book is told about the
general principles of turning and many things worth kno-
wing and handy summaries of problems with possible
causes and solutions.
FUNCTION OF THE MACHINE.
For a good understanding of the working of the machine
this one can for conve nience sake be divided in a number
of main groups and components, all with a special func-
tion. Watch fig.1.
Ferm 5
5

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