GRAUPNER Skalar, Manual

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elektro
Skalar
12
bottom layshaft bearing bracket through 180° horizontally and re-install it. This procedure com-
pensates for any slight offset of the brass inserts in the bearing supports; these manufacturing
tolerances can never be completely avoided. The meshing clearance between the spur gear and
the layshaft pinion can now be adjusted by loosening the M3 x 16 socket-head cap screws
slightly in the bearing brackets, drawing a strip of thick writing paper between the gears, pres-
sing the gears together, and re-tightening the screws. Wind the paper out, and the gears should
now rotate smoothly without any tendency to bind at any point; if you are not sure, repeat the
adjustment process.
1.5 Installing the motor
(bag SKA-2)
Screw your selected motor to the motor mount 4475.05 as shown in the illustration. Place this
assembly in the mechanics, and position it so that the rear of the motor mount can be attached
to the underside of the upper layshaft bearing bracket using M3 x 12 socket-head cap screws.
You will find two holes in the lower layshaft bearing bracket, through which the allen key can be
fitted in order to tighten the screws. The upper bearing bracket features three pairs of threaded
holes which, in conjunction with the slots in the motor mount, make it possible to attach the mo-
tor mount in a position to suit the various motor pinions which can be used. You may need to
turn the bearing bracket through 180° horizontally to obtain the correct position of the appropri-
ate pair of threaded holes.
At the front the motor mount should be fixed to the motor mount holder 4475.27 using two M3 x
10 socket-head cap screws, at the same time fitting an appropriate number of plastic spacer
washers (type “C” from the laser-cut washer set) between the parts to suit the motor pinion you
are using. The slots in the motor mount allow adjustment of the meshing clearance in the first
gearbox stage. This is carried out by first feeding a strip of thick drawing paper between the
gears, then pressing the gears together before tightening the motor mount retaining screws fully.
Ensure that the gears rotate exactly parallel to each other, i.e. that the motor is not installed at
the wrong angle. Remove the paper strip from between the gears, and you should just be able to
detect minimal gear meshing clearance.
Note: if you find that you cannot mount your chosen motor correctly because it fouls the me-
chanics side frames, remove material from the frames using a fretsaw and file.