IMET BS400/60 AFI-E - Page 32

TRADUCTION OF THE ORIGINAL INSTRUCTIONS FOR USE
BS 400/60 AFI-Eing ED.2011 rev.00 31/60
In case of broken teeth, broken blades or short blade
life, lay down the broken band on the floor and check
the body and teeth defects; look for them in the
following table and read the solution of the cutting
problem 1. PREMATURE AND EXCESSIVE TEETH
WEAR AND TEAR
- thrust pressure to short: increase it;
- reduce the band wheel speed;
- cooling jet too short;
- improper cooling emulsion;
- uncorrect toothing: use a band with a thicker
toothing:
- improper band-running-in;
- the teeth move towards the opposite cutting
direction; turn the band.
2. BLADE VIBRATION
- Increase or reduce the band speed
- dull vibration: incresae 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 dued to the high frequency:
increase the speed of the saw frame lowering;
- the material is not rightly locked;
- use a viariable pitch or a positive toothing.
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. PREMATURE BAND BREAKAGE
- Too hugh band thickness for the diameter of the
band wheel;
- band guides too open with high speed;
- oncrease or reduce the speed;
- check if the band wheels are defective;
- too big toothing;
- 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
spiralles 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 RIGHT
- Approach the band guides to the cutting unit;
- check if the cutting piece is rightly horizonataly
placed on the support table;
- control the band perpendicularity: if it is out of
perpendicularity, work on the band guides;
- toothing 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 alignement;
- check the thrust bearing wear and tear;
- the welding is not perfect.
9. THE BLADE BENDS POSITIVELY
- Reduce the cutting pressure;
- use bigger teeth for increasing the penetration;
- approach the band guides to the cutting unit.
10. THE BAND BENDS NEGATIVELY
- The band back strains against the upper thrust
bearing band guides; check if the space between the
band back
and the band wheel rim is always the same by band
in movement and band stopped;
- check the alignement of the band wheels.
11. SLOW CUTTING, THIN CHIPS
- Increase the bend wheels speed;
- increase the cutting pressure;
- use bigger teeth;
- use a proper coolant.
12. PREMATURE LOSS OF THE SIDE SETTING
- Reduce the bad wheels speed;
- increase the distribution of the coolant.
13. THE BLADE TWISTS LIKE A SPRING
- Reduce the cutting pressure;
- reduce the band tension;
- excessive pressure on the band guides: adjust it;
- approach the bad guides to the cutting unit.
14. THE CHIP WELDS TO THE TOOTH / CHIPS
ARE TOO BIG
- Reduce the cutting pressure
- use proper coolant and in a good quantity;
- check the wear and tear of the burst used for
clening the chips from the grooves.