User guide

26
SAR 440 SA GDS
TROUBLESHOOTING
This chapter lists the probable faults and malfunctions that could occur while the machine is being used and suggests possible remedies for
solving them.
The first paragraph provides diagnosis for TOOLS and CUTS, the second for ELECTRICAL COMPONENTS.
12.1 - Blade and cut diagnosis
12
FAULT PROBABLE CAUSE REMEDY
TOOTH BREAKAGE
Decrease advance, exerting less cutting
pressure. Adjust the braking device if
mounted on the machine.
Change speed and/or type of blade.
See chapter on “Material classification and
blade selection”, in the section
Blade selec-
tion table according to cutting and feed
speed.
Choose a suitable blade. See Chapter “Ma-
terial classification and blade selection”.
Check for clogging of cooling liquid drain
holes on the blade-guide pads and that flow
is plentiful in order to facilitate the removal
of chips from the blade.
Material surfaces can be oxidised or covered
with impurities making them, at the begin-
ning of the cut, harder that the blade itself,
or have hardened areas or inclusions inside
the section due to productive agents used
such as casting sand, welding wastes, etc.
Avoid cutting these materials or in any case
perform cutting with extreme care, clean-
ing and removing such impurities as quickly
as possible.
Check the gripping of the part.
Reduce feed and exert less cutting pressure.
Pay more attention when you start cutting.
Use a superior quality blade.
Accurately remove all the parts left in.
Make the cut elsewhere, turning the part.
Check gripping of the part.
Replace blade with a more suitable one.
See “Material classification and blade
selection” in the
Blade Types section.
Adjust blade guide pads.
Check level of liquid in the tank. Increase the
flow of lubricating refrigerant, checking that
the hole and the liquid outlet pipe are not
blocked.
Check the emulsion percentage.
Turn teeth in correct direction.
Too fast advance
Wrong cutting speed
Wrong tooth pitch
Chips sticking onto teeth and in the gul-
lets or material that gums
Defects on the material or material too
hard
Ineffective gripping of the part in the vice
The blade gets stuck in the material
Starting cut on sharp or irregular sec-
tion bars
Poor quality blade
Previously broken tooth left in the cut
Cutting resumed on a groove made pre-
viously
Vibrations
Wrong tooth pitch or shape
Insufficient lubricating refrigerant or
wrong emulsion
Teeth positioned in the direction oppo-
site the cutting direction