10
Operator’s Manual – BM-21 Bevelling Machine
3.3. Bevelling metal plates
Slide the bevelling machine to the left. Note that the feed rate depends on the profile and
composition of the working material. You can bevel the majority of weldable steels in just one pass.
It is recommended to perform bevels wider than 12 mm (1/2’’) in at least two or three passes.
To obtain maximum bevel width (21 mm, 13/16’’) in two passes, first pass should be 14 mm wide
(9/16’’), whereas for three passes the first one should be 12 mm wide (1/2’’) and the second one
should be 16 mm wide (5/8’’).
If the feed is too fast, a red signal lamp illuminates, indicating motor overload (Figure 2, Item 5).
Further load increasing triggers safety circuit and shuts down the motor. In this case, move the tool away
from bevelled edge, press main switch to “0” position and after red signal lamp turns off press main
switch back to “I” position. Operation with the maximum permitted load (with flashing red signal lamp) is
technically possible, but motor temperature should not exceed 85°C (185°F). The motor can work under
high temperatures, but long overheating may permanently damage the windings. Therefore, after every
hour of working under full load, stop the motor to cool it down for 10–15 minutes. Do not cool the motor
down by leaving it in the idle state, because it will become heated even faster than when working with
load.
3.4. Bevelling
pipes
The guide with rollers supplied as a part of standard equipment enables to bevel pipes with
diameters 150–300 mm (6–12’’).
To prepare the machine for work on pipes, unscrew two M8 bolts (Figure 4a, Item 2) using size 6
Allen key. Then, take out the guide set (Figure 4a, Item 1, 5), rotate it by 180º around the axis indicated
in Figure 4a, mount as shown in Figure 4b and secure again with M8 bolts. Using size 8 Allen key and
size 12 flat key, unscrew bolts (Figure 4a, Item 4) that secure the rollers. Then, move rollers (Figure 4a,
4b, Item 3) from opening (Figure 4a) to slot (Figure 4b), placing T-nut (Figure 4a, 4b, Item 6) into the
slot.
Using adjusting knob (Figure 3, Item 5), set “0” position on the pitch (Figure 3, Item 4).
Move rollers away from each other and place the machine as shown in Figure 5, with horizontal guide
(Figure 4b, Item 5) touching the pipe. Then, move rollers (Figure 4a, 4b, Item 3) symmetrically to touch
the pipe and secure with bolts (Figure 4b, Item 4) in this position. Adjust required bevel width and angle
(see “Adjusting bevel width and angle”) and start to work with bevelling machine.