MULTICUTTER MC40
7
CUTTING TROUBLE
1) Insufficient penetration
This may be due to:
high speed. Always make sure that arc thoroughly passes through the piece to be cut and that it is
not tilted, when going forward, by a percentage above 10 / 15°(see picture 6). It is thus avoided to
wear nozzle (see picture 7) out and to burn the nozzle holder (see picture 8).
Excessive thickness of piece (see graph of cutting speed and thickness)
Work clamp H not properly in electric contact with piece
Worn nozzle and electrode
Too low cutting current.
N .B. : When the unit does not thoroughly pass through, nozzle is clogged by scums.
2) Cutting arc switches off
This may be due to:
worn nozzle, electrode or diffuser B
too high air pressure
too low feed voltage
3) Tilted cutting
When cutting is tilted (see picture 9) switch the unit off,
loosen nozzle holder and turn nozzle by a quarter turn, then
lock and try again.
Repeat until cutting is straight (see picture 10).
4) Excessive wear of consumable parts
This may be due to:
a) too low air pressure with respect to the recommended one
b) excessive bums on the end part of nozzle holder.
PRACTICAL RECOMMENDATIONS
If the system air contains much humidity and oil it is required to use a drying filter to avoid excessive
oxidation and wear of consumable parts, to avoid torch damage or to reduce speed and quality of
cutting.
Impurities of air favour oxidation of electrode and nozzle and make it difficult to start pilot arc. If this
occurs, clean the end part of electrode and inside the nozzle with fine abrasive paper.
Make sure that new electrode and nozzle to fit are clean and degreased.
To avoid damage of torch and to prevent dangerous situations always use genuine spares.
TORCH MAINTENANCE
The introduction for torch are just for your reference.
Please be subject to the actual products if anything different or updated
Replace wear parts (picture 11)
The parts subject to wear are electrode A, diffuser B and nozzle C.
nozzle holder
D.
Either part may be only replaced after loosening nozzle holder D. Electrode A should be replaced
when a 1.5mm deep crater is created in the middle (see picture 12).
ATTENTION! Do not make sudden stresses when unscrewing the electrode, but gradually
force so as to have the thread unlocked. Lubricate the thread of the new electrode with
silicone lubricant (on supply with the unit). This new electrode is required to be screwed in
its housing and locked without tightening.