- the teeth move towards the opposite cutting direction; turn the band.
2. BLADE VIBRATION
- Increase or reduce the band speed
- dull vibration: increase the band tension;
- too big teeth for the piece that must be cut;
- the vibration reverberates in the base; reduce the cutting pressure;
- the vibration could be due to the high frequency: increase the speed of the saw frame lowering;
- the material is not rightly locked;
- use a variable pitch or a positive tooth pitch.
3. BROKEN TEETH
- Too big teeth for the section that must be cut;
- the material is not perfectly locked;
- improper coolant;
- inadequate coolant;
- cutting pressure too high: control the chip;
- too low band wheel speed;
- the grooves are full of cut material.
4. CUTTING SURFACE TOO ROUGH
- Choose a thinner pitch;
- increase the band wheel speed;
- reduce the head lowering;
- measure better the coolant.
5. EARLY BLADE BREAKING
- Too big band thickness for the diameter of the band wheel;
- band guides too open with high speed;
- increase or reduce the speed;
- check if the band wheels are defective;
- too big tooth pitch;
- band tension too high; the lying down band rises on the side;
- saw frame lowering too strong: the band back is polish and upset;
- The thrust bearings are not aligned with the band wheels: the lying band curves and the band back is polish
and upset;
- the band guides are too tight: the lying band spirals up as a spring; the more the teeth are tight, the more the
band twists;
- short coolant.
6. BENT CUTS
- Increase the band tension;
- approach the band guides to the cutting unit;
- the teeth are too thin;
- reduce the cutting pressure.
7. THE CUT IS NOT STRAIGHT
- Approach the band guides to the cutting unit;
- check if the cutting piece is rightly horizontally placed on the support table;
- control the band perpendicularity: if it is out of perpendicularity, work on the band guides;
- tooth pitch too thick;
- the teeth are broken or variegated;
- increase the cutting speed.
8. BLADE NOISE ON THE THRUST BEARINGS
- Burr or adjust the band back;
- check the band wheel alignment;
- check the thrust bearing wear and tear;
- the welding is not perfect.
9. THE BLADE CURVES POSITIVELY
- Reduce the cutting pressure;
- use bigger teeth for increasing the penetration;
- approach the band guides to the cutting unit.