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Troubleshooting the J-FK350
14.1 Blade and Cutting Problems
Problem
Teeth breaking
Rapid tooth wear
Broken blade
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
Solution
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
2
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. Use disc
with greater pitch.
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.
for hard materials and about
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