Problems - woodband saws
Cracking in a saw's gullet
| possible causes | suggested 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 causes | suggested 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 causes | suggested 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) |