BUG-O Systems Flame Cutting - Manual (Page 19)

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(4) Using a soap stone, mark the spot where
the tip stopped. Measure the distance
between the two marks-“This is inches
(mm) per minute travel.”
(5) Repeat a different dial positions to
establish correct speed settings.
(6) See tables for recommended travel
speed settings.
4. LIGHTING THE TORCH AND SETTING THE
PREHEAT FLAME
a. Adjust cutting goggles over eyes.
b. Put on gloves.
c. Open gas valve ¼ turn.
d. Open preheat oxygen valve 1/8 turn.
e. Put striker at tip end and light torch.
f. Adjust preheat flame to neutral by turning
oxygen and gas valves one at a time and
watching the blue flame cones for
sharpness.
5. ADJUSTING THE PREHEAT FLAME FOR
MAKING A SQUARE EDGE CUT
a. A simple rule to follow when a square edge is
desired is to have the preheat flame come
out as a whisper or a shoooosh rather than
having a rush of gas and oxygen come out
with such a force that the preheat flame has
a shrill whistling sound. The whispering
preheat flame has just enough heat to keep
the leading edge and sides of the cut barely
melting. Little sparkles will be present around
the top surface of the hole which indicates
that a correct preheat flame is used to give a
square edge to the top of the cut. The
whistling preheat flame has too much heat
that keeps the leading edge and sides melting
and will cause a rolled edge to the top of the
cut.
Flame Cutting Handbook.p65 5/9/2007, 8:06 AM 19