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A stable circular saw blade is the most important factor for obtaining good cutting results. Stability should be necessary at the machine main bearing, spindle and clamping device. Insufficeint stability generates vibration at the machine and/or saw blade and leads to serious loss of tool life and saw blade breakage. Also the cutting material must be fixed perfectly, especially when cutting various profile shape tubes, special formed fixture is highly recommended.

Thorough cleaning of the saw blade and flange before mounting is very esential and important. Even single chip between the saw blade and flange may ause of excessive side run out as well as machine stabilty and cut quality.

When mouning the saw blade equipped with pinholes, backlash in the pinholes must be removed before tightening the saw blades with flanges. Putting slight pressure against front face of saw body in a reverse direction of the saw blade rotation and tightening the pinhole bolts/ screws. Failure to remove this backlash may cause of saw blade breakage.

Recommend to conduct "Running in" procedure for obtaining the longer tool life when use new / re-sharpened saw blade as below.

• ① Make around 10 cuts at normal RPM with at only 25 ~ 50 % of normal feed rate.
• ② Gradually increase the feed rate until reached to normal feed rate.

Above procedure could removes the sharp edges of tooth tips and thus increasing tool life.

- Saw blade has too many tooth for current cutting application
- Fz is too high (Fz : Feed rate, Feed/tooth or chip load/tooth)
- Insufficient clamping of cutting material
- Cutting speed is too high
- Check the blade rotation direction
- normal or reverse direction

- When the chips sticks to the tooth front face, generates excess cutting pressure on the cutting edge and
  leads to tooth breakage. Remove these chips by install wire brush, air gun or using cuting fluid.
- Use more bigger tooth pitch saw blade.
  More space between the teeth could improve chip sticking problem.
- Vibration from the saw blade and/or cutting material leads to tooth breakage.
- Improve clamping device of cutting material for perfect clamp.
- Check the machine bearing status, spindle bent status.
- Consider to change tooth geometry.

[ Inside burr ]

① Cutting edge worn out

② Incorrect tooth geometry

③ Incorrect tooth pitch - Tooth pitch is too big

④ Saw blade vibration - Check the cutting
machine condition & Saw blade stability

[ Outside burr ]

① Cutting edge worn out

② Incorrect tooth geometry

③ Fz is too low
(Fz : Feed rate, Feed/tooth or chip load/tooth)

④ Cutting speed is too high

[ Surface cutting quality ]

① Surface scratched - Some tooth damaged

② Rough surface
- Vibration : Incorrect cutting parameters (change cutting speed and/or feed rate)
  Incorrect saw blade (change saw blade type and/or tooth geometry)
- Wave - increase feed rate
- Rough wave - increase cutting speed

① Feed rate ( Fz ) is too low

Generates improper chip formation like metal powder status. The blades worn out very rapidly and blade life is reduced significantly.

② Feed rate ( Fz ) is too high

Discolored chip may sticking at gullet area. High risks of blade breakage.

③ Feed rate ( Fz ) is optimal

Chips are well rounded, uniform status with bright color. Maximum tool life and longer use.