Troubleshooting Blade And Cutting Problems - JET J-F225 Instrucciones De Funcionamiento Y Manual De Piezas

Troubleshooting Blade and Cutting Problems

Problem
Teeth breaking
Rapid tooth wear
Broken blade
Spindle motor will not
turn
Probable Cause
Incorrect lubricant/coolant fluid
Material too hard
Disc not worn--in correctly
Disc with excessively fine
tooth pitch
New blade inserted in a
partially completed cut
Work piece not clamped firmly
in place
Feed speed too slow
Cutting pressure too high
Blade speed too high
Insufficient coolant
Incorrect fluid concentration
Material defective
Feed speed too high
Teeth in contact with material
before starting the cut
Insufficient coolant
Electrical power supply
Transformer
Contactor
Thermal relay
Motor
Ensure proper coolant flow.
Check the cutting speed, feed speed and air pressure
parameters and the type of blade you are using.
With a new blade it is necessary to start cutting at half
feeding speed. After the wearing--in period (a cutting
surface of about 300 cm
2
1000 cm for soft materials) the cutting and feed
speeds can be brought up to normal values
The swarf wedges into the bottom of the teeth causing
excessive pressure on the teeth themselves
The surface of the cut may have undergone work
hardening. When starting work again, use a lower
cutting speed and head feed speed. A tooth from the
old blade may be left in the cut: check and remove
before starting work again.
Any movement of the work piece during cutting can
cause broken teeth: check the vise, jaws and clamping
pressure.
The blade runs over the material without removing it:
increase feed speed.
Reduce cutting pressure.
The teeth slide over the material without cutting it:
reduce the blade speed.
Check the coolant level and clean coolant lines and
nozzles.
Check and use the correct concentration.
The materials may present altered zones either on the
surface, such as oxides or sand, or in section, such as
under-cooled inclusions. These zones, which are
much harder than the blade, cause the teeth to break:
discard or clean these materials.
Reduce blade speed.
Always check the position of the blade before starting
a new job.
Check the coolant level and clean coolant lines and
nozzles.
Check: the cables, plug and socket. Also check that
the motor connections are in place.
Check that the voltages are present both on the input
and output. Otherwise replace.
Check that the phases in it are present both on the
input and output, that it is not jammed, that it closes
when powered and that it is not causing short circuits.
Change if any of these problems are found.
Make sure it is closed, i.e. check that the phases are
present in input and output that it is not causing short
circuits and responds when the reset coil is closed. If it
has tripped to protect the motor, check the amperage
setting, reset, and check the motor. Change if
necessary.
Check that it has not burnt out, that it turns freely and
that there is no moisture in the connection terminal
board box. The winding can be rewound or replaced.
15
Solution
2
for hard materials and about