Operating - Promotech BM-21S Operator's Manual

3.4. Operating

After setting the bevel angle and width, connect the machine to a properly grounded
power outlet. Then, place the machine vertically on the right to rest the rollers on the
plate and maintain a gap between the milling head and the plate (Fig. 11).
Feed direction
Slide toward after starting the motor
Fig. 11. Machine properly positioned on the workpiece
Power on the machine by setting the power switch to position 'I', and start the motor
using the green START button. Slide the machine toward the plate face and bevel by
sliding the machine to the left, constantly pressing the machine against the workpiece.
Bevelling is performed according to the counter-rotation. The rotation direction of
the milling head is marked on the motor disk under the milling head cover.
The feed rate will depend on the profile and composition of the workpiece.
Most steels capable of being welded can be bevelled in one pass. However, make
bevels wider than 12 mm (1/2'') in at least two or three passes because this will require
less effort and total time than for bevelling in a single pass.
To obtain the maximum bevel width (21 mm, 13/16'') in two passes, the bevel
after the first pass should be about 14 mm (9/16'') wide, while for three passes about
12 mm (1/2'') wide after the first pass and about 16 mm (5/8'') after the second one.
If the maximum permitted motor load is exceeded because of, for instance, too
fast feed, the red overload lamp will light. Continuing the operation in such a case will
trigger the safety circuit and shut down the motor. If as a result of an overload the
motor will shut down, separate the machine from the working edge, turn off the power
Copying, using, or distributing without permission of PROMOTECH is prohibited.
Power switch
START
STOP
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BM-21S