Problems - wide sawmill band-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
the gullet rounding radius too small sharpen the saw increasing the radius
saw overheated – continuous work with no rest adhere to the recommendations given
incorrect saw’s strain set the strain according to the machine technical spec.
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
irregular back of the saw correct by adjusting
incorrect setting (too small, too big, asymmetrical) correct the setting
overworked surface of the guide pulleys grind the surface of the guide pulleys regularly
irregularities of the guide pulleys’ surface grind the guide pulleys
sawdust and chips between the saw and the guide pulleys keep the working surface of the guide pulleys clean

 

 

 

Irregular cut

 

possible causessuggested solutions
incorrect saw’s strain set the strain according to the machine technical spec.
the guide pulleys in poor condition, not set in one line regulate the guide pulleys, set them in one line
incorrect tool rake angle correct the tool rake angle by sharpening
incorrect pitch chosen choose the correct pitch
asymmetrical setting correct the setting
asymmetrical swaging, stelliting correct the swaging, the stelliting by grinding sides

 


Saw wandering along guide pulleys

 

possible causessuggested solutions
incorrect amount of the crown adjust the band saw again (according to the amount of the crown on the guide pulleys)
incorrect tool rake angle correct the tool rake angle by sharpening
incorrect saw’s strain set the strain according to the machine technical spec.
overworked surface of the guide pulleys grind the surface of the guide pulleys regularly
irregularities of the guide pulleys’ surface grind the guide pulleys
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