IMET VTF 500 - Page 30

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30
4. TOO COARSE CUTTING SURFACE
- choose a thinner pitch;
- increase flywheel velocity;
- reduce head lowering;
- measure the cooling better;
5. PREMATURE BAND BREAKAGE
- too high band thickness for the diameter of the
flywheel;
- band guides too open with high speed;
- increase or reduce speed ;
- check flywheels are not defective;
- teeth too coarse;
- band tension too high : the layed down band
curves the sides ;
- head thrust too high: back band is polish or
upset;
- thrust bearings are not aligned with flywheels:
the layed down band curves and the band back is
polish and upset;
- band guides too tight : the layed down band
spiralles up as a spring ; more tight , more twist;
- improper cooling fluid.
6 - BENDED CUTS
- increase band tension;
- approach band guides to the cut;
- teeth too thin;
- reduce cutting pressure;
7 - TWISTED CUTTING
- approach band guide to the cut;
- check piece support table - it must be
horizontaly adjusted with the piece ;
- check band perpendicularity; if it is out of
perpendicularity , operate the band guide;
- teeth too tick;
- fracture or broken teeth;
- increase cutting speed;
8 - BAND NOICE ON THRUST BEARING
- burr or adjust the back;
- check flywheel alignment;
- check thrust bearing wear and tear;
- incorrect welding;
9 - BAND CURVES POSITIVELY
- reduce cutting pressure;
- use bigger teeth to increase penetration;
- approach band guides to the cut;
10- BAND CURVES NEGATIVELY
- the back strains against the upper trhust bearing
band guides; check the light on the flywheel rim
and on the thrust bearing when immobile cut and
when motor in motion;
- check flywheels alignment.
11 - SLOW CUTTING, THIN CHIPS
- increase flywheel velocity;
- increase cutting pressue;
- use bigger teeth;
- use a suitable cooling ;