Cosen C-620NC, Instruction Manual, Page: 88 / 122

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BLADE TROUBLES AND SOLUTIONS
DISCONNECT POWER CORD TO MOTOR BEFORE ATTEMPTING ANY REPAIR OR INSPECTION.
TROUBLE PROBABLE CAUSE SUGGESTED REMEDY
Teeth
strippage
Too few teeth per inch Use finer tooth blade
Loading of gullets Use coarse tooth blade or cutting lubricant.
Excessive feed Decrease feed
Work not secured in vise Clamp material securely
Blade
breakage
Teeth too coarse Use a finer tooth blade
Misalignment of guides Adjust saw guides
Dry cutting Use cutting lubricant
Excessive speed Lower speed. See Operating Instructions “Speed
selection.”
Excessive speed Reduce feed pressure. Refer to Operating Instructions
“Adjusting Feed.”
Excessive tension Tension blade to prevent slippage on drive wheel while
cutting.
Wheels out of line Adjust wheels
Blade line
Run ‐ out or
Run ‐ in
Guides out of line For a straight and true cut, realign guides, check
bearings for wear.
Excessive pressure Conservative pressure assures long blade life and clean
straight cuts.
Support of blade insufficient Move saw guides as close to work as possible.
Material not properly secured
in vise
Clamp material in vise, level and securely.
Blade tension improper Loosen or tighten tension on blade.
Blade
twisting
Blade not in line with guide
bearings
Check bearings for wear and alignment.
Excessive blade pressure Decrease pressure and blade tension
Blade binding in cut Decrease feed pressure
Premature
tooth wear
Dry cutting Use lubricant on all materials, except cast iron
Blade too coarse Use finer tooth blade
Not enough feed Increase feed so that blade does not ride in cut
Excessive speed Decrease speed