Troubleshooting; Blade And Cutting Problems - Jet CS-275 Operating Instructions And Parts Manual

15.0 Troubleshooting

15.1 Blade and cutting problems

Problem
Teeth breaking
Rapid tooth wear
Broken blade
Cuts not straight
Probable Cause
Coolant flow problem
Material too hard
Blade not worn-in correctly
Blade with excessively fine
tooth pitch
New blade inserted in a
partially completed cut
Work piece not clamped firmly
in place
Feed speed too slow
Blade speed too high
Insufficient coolant
Incorrect fluid concentration
Material defective
Blade speed too high
Teeth in contact with material
before starting the cut
Insufficient coolant
Feed speed too strong
Blade not perpendicular to
workpiece.
Ensure proper coolant flow; hoses unclogged; nozzles
pointed correctly, etc. Make sure coolant type is
suitable for the machine.
Check the blade speed and the type of blade you are
using. Also be aware of feed pressure.
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 blade and feed speeds
can be raised to normal values.
The swarf wedges into the bottom of the teeth causing
excessive pressure on the teeth themselves. Use a
blade with coarser tooth pitch.
The surface of the cut may have undergone work
hardening. When starting work again, use a lower
blade speed and reduced feed pressure. 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.
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.
Reduce feed speed.
Adjust blade tracking according to instructions. If this
proves unsuccessful, contact JET technical support.
Table 5
17
Solution
2
for hard materials and about