TIPS FOR THE CORRECT USE

To obtain the best performance from a saw blade we suggest to follow these simple instructions:

The machine must be in good condition, free of vibrations.

The flanges used to secure the blade must be of the same diameter, at lease 1/3 of the blade’s diameter (Figure 1)

The flanges must be parallel to each other. Also check tolerances on diameters, sides and concentricity, by using a clock gauge.

The spacers must be perfectly parallel (Figure 2).

The spindle must be perfectly straight and with an H7 tolerance (Figure 3).

After continous use, remove the blade and clean it with the appropriate solvents making sure to get rid of built up resin. For the synthetic coated (permaSHIELD) blades, it’s sufficient to use warm water. In any case, avoid using solvents containing caustic soda.

The blades must be sharpened as soon as they become dull, maintaining the original tooth angles.

For sharpening, always use the correct grinding wheels and plenty of cooling liquid.

Maximum reboring of the blade is 20 mm of the original bore size. Above this value, the blade will lose its original tuning and overall performance will be affected (Figure 4).

Always keep the spacers and flanges clean.

When sharpening, the shoulder of the teeth must not be lowered more than needed. This operation must be done with appropriate precision machinery and never by hand. There is the risk of breaking the tip or upsetting the blade balance (Figure 5-6).

On ripping machines, the feeding track must be levelled with the fixed table.

Before starting the cut of the material, make sure the blade is correctly locked according to the machine’s specifications.

SAW BLADE ALIGNMENT ON A TABLE SAW

If the saw blade and the saw are not correctly aligned to the table and the fence, then there is the possibility that a serious accident may occur (for example, violent kickbacks) or that the workpiece may scorch or splinter. The first thing you must do is read the instruction sheet carefully. This is necessary so as you may acquire the understanding and comprehension of the corrections suggested in this section.

Before carrying out the following instructions, make sure that the starter switch is off and that the machine is not connected to the socket.

MOUNTING THE SAW BLADE ONTO THE TABLE

We advise you to use precise measuring instruments when mounting your saw blade. Clean the saw blade well, before mounting in onto the machine. Mount the saw blade onto the arbor. Adjust the arbor to its maximum height. With the aid of the most precise measuring instrument available, verify that the saw blade is parallel to the miter gauge slots (Figure 7). Adjust as needed. this step is necessary to obtain crosscuts with the maximum in quality finish and for setting up the fence for ripping.

POSITIONING THE FENCE FOR RIPPING

After having positioned the saw blade so as it is parallel to the miter gauge slots, you may proceed with setting the fence. The fence should ideally be parallel to the saw blade. However since it is impossible to position the guide ‘exactly’ it is necessary to leave a slight margin of the clearance on the exit side of the cut so as to avoid the wood becoming wedged in between the fence and the saw blade.

Adjust the fence so as when it is aligned to the miter gauge slots, there is a space of 0,1 mm (Figure 8; for the correct adjustment, consult the machine’s instruction manual).

The maximum RPM of a circular saw blade varies according the diameter of the blade itself (Table 1). If you exceed this limit, the saw blade will lose its characteristics, therefore influencing the cutting quality and the work life of the blade it self, not to mention the dangers implied to the user who may incur serious injury

The saw blade’s projection (T) with respect to the workpiece must be at least equal to the height of the blade’s tooth (Figure 9). Increase or decrease the projection of the saw blade to improve the quality of the cutting finish.

The number of teeth cutting (teeth cutting the wood simultaneously – Figure 10) must be between 3 or 4. With less than three teeth cutting, the saw blade begins to vibrate leading to an uneven cut. If you want to cut workpieces with increased thicknesses (S – Figure 12), but wish to maintain the same diameter saw blade, then use a blade with less teeth. If instead you want to cut workpieces with a reduced thickness, but also maintain the same diameter saw blade, then use a blade with more teeth.

To obtain the pitch (P) of a blade  (the distance between teeth: Figure 11 – see formula ‘a’) multiply the thickness of the workpieces by 1,4142 and divide by 3 (if you want 3 teeth cutting) or by 4 (if you want 4 teeth cutting).

Formula ‘b’ : to obtain the number of teeth (Z) of the saw blade, multiply the diameter (D) of the saw blade by 3,14 (pi) and divide by the pitch of the saw blade – obtained from the previous formula. The shorter formula ‘c’ allows you to obtain the nr. of the saw blade’s teeth, knowing its diameter and the thickness of the workpiece.

KEY

P= Pitch

S= Thickness of the workpiece

Z= Nr. teeth of the saw blade

D= Diameter of the saw blade

 

ATTENTION ! These formulas are valid for cross cutting and cutting other wood composites of (MDF, plywood, chipboard and laminated panels) and cannot be applied for ripping.

Rakers (Figure 13) are inserts in HW that are brazed onto saw blades exclusively for cutting wood. They help keep a distance between the saw blade body and the workpiece, in order to avoid friction and overheating which cause the blade to deform.

On saw blades for multi ripping machines the anti kick-back device is advised in cases where wood has loose knots and discards cases insert themselves underneath the saw blade

The pairing of blade and arbor with keyways is excellent in all cases where the keyways are the same (Figure 14) or smaller then the blade slots (Figure 15).

On machines with an arbor with 1 keyway, you can only mount blades with 1 keyway slot (Figure 16); on machines with an arbor with 2 keyways, you can only mount blades with 2 or 4 keyway slots (Figure 17).

You cannot mount a saw blade with 2 keyways on an arbor with 1 keyway slot, because the pairing will not be balanced.

Incase multi ripping saw blades are used, it is recommendable to assembly them with alternate keyways (Figure 18)

Shoulder blade ensures correct distribution of lateral forces created by crooked planks in heavy duty use. The shoulder blade must be the first blade on the guide side of the multi ripping machine.

Always use shoulder blade with the set of multi ripping blades (Figure 19).

On multi ripping saw blades, the thickness of the workpiece (S) varies according to the diameter of the blade (Ø) and the minimum diameter (Ø1) of the rakers (the rakers position may vary from blade to blade – Figure 20).