Problems - woodband saws

Cracking in a saw's gullet

 

 

 

 

 possible causessuggested solutions
sharpening the part of the tooth’s profile sharpen the whole tooth’s profile
burn marks in the saw’s gullets after sharpening,
deep scratches on the saw left after sharpening
match the abrasive disk, adapt the profile of the abrasive disk, use cooling and required feed during sharpening
dull blade stop working, sharpen the saw
incorrect setting (too small, too big, asymmetrical) correct the setting
saw overheated – continuous work with no rest adhere to the recommendations given
the gullet rounding radius too small sharpen the saw increasing the radius
incorrect saw’s strain set the strain according to the machine technical spec.
the diameter of the guide pulleys too small use a thinner saw
the cutting edges went in contact with the material before the proper operating speed was achieved start cutting no sooner than the proper operating speed is achieved, according to the machine technical spec.
leaving the saw strained after work always loosen the strain after work

 

 

 

Cracking at the back side

 

 

 

 

 

 possible causessuggested solutions
incorrect saw’s strain set the strain according to the machine technical spec.
excessive feed – saw overload decrease the feed
saw overheated – continuous work with no rest adhere to the recommendations given
the guide pulleys in poor condition, not set in one line regulate the guide pulleys, set them in one line
worn or dirty guide rolls, not set in one line move the rolls close to the cutting zone,
clean and set them in one line
incorrect width of the guide rolls to saw’s width match the proper guide rolls
vibrations of the pulleys or the gears, axial run-out of the pulleys replace worn out bearings

 

 

 

Wavy motion of a saw

 

 

 

 

 

 possible causessuggested solutions
incorrect setting (too small, asymmetrical) correct the setting
excessive surface irregularities left after sharpening smoothen the sharpened surface and correct the setting
low cutting speed, excessive feed check and correct the strain of the saw and the driving belts; decrease the feed
the cutting edge of the band wandering along the guide pulleys (decreasing the setting at one side) use a broader saw, correct the setting’s symmetry
incorrect saw’s strain set the strain according to the machine technical spec.
unstable locking of the material cut lock the material firmly in a fixed position
worn out bearings of the pulleys, rolls, play in the saw’s strain system replace (repair)
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