Sawing discs

1. The rake angle – cut quality, feed and cutting force depends on this angle. This angle always correlates with entry and exit angles to the workpiece. Rake angle depends on material to be processed (decreasing rake angle – soft and hard wood, chip materials, non-ferrous metals) and cut quality on one or both workpiece sides.

a) Positive rake angle – fast and easy cutting; cutting force in the direction of workbench (ideal for hand held saws); cut quality good in the bottom, poor in the upper side.

b) Negative rake angel – more power required for cutting; cutting force in the direction of workpiece (ideal for mitre saws); cut quality good in the upper side, poor in the bottom of the workpiece.

4. Clearance angle – this angle influences the chip size. In case the clearance angle is too low – chip removal by next tooth is not possible (cutting will stop). The bigger clearance angle – bigger chip and faster feeding is possible.

Entry and exit angles – usually exit angle is not very important, because it correlates with entry angle. Very often entry angle grants good cut quality, therefore “good side” of workpiece must be placed upside down during cutting process

Saw blade projection – ideal saw blade adjustment is 8 – 10 mm above the workpiece surface. Increasing saw blade projection the exit side workpiece quality decreases, but it doesn’t improve entry side cut quality

Saw blade thickness – thick blades are more stable and suits for precise cuts in thick materials using powerful machines. Thin blades suits for thin material cutting using less power. Therefore thin blades are ideal for cordless tools.

Alternately bevel-ground tooth

Very clean cut in soft and hard wood, wood-fiber, laminate and plastics.

Negative rake angle.

For use in mitre saws.

Flat tooth

Perfect for fast and coarse lengthwise cuts in solid wood.

Flat / trapezoid shape tooth

Very clean cut in plastics, aluminum, copper, brass, coated chipboards and MDF boards, other wooden materials.

Negative rake angle.

For use in mitre saws.

Flat / chamfered tooth

Ideal for construction wood, plywood boards (also with nails and concrete residues), chipboards.

Extremely robust teeth.

For use in table saws and powerful hand saws.

Roof / hollow tooth

Perfect for boards with coating on both sides – very precise and clean cut.

Pointed tooth, “wolf” tooth

Usually used with log cutting saws, high performance table saws and circular saws.