Perhaps, like any frequently used tool, the bandsaw has its own scope where it almost has no equal. In this article we will see this by examining the different tool options. And, most importantly, learn the features of the sharpening band saw blades.
let’s start with a General description of the band saw.
Band saw has the form of a blade having a serrated edge, which is connected in a continuous ribbon. Simply put, this tool is nothing like a closed band with teeth.
And to make sure that the bandsaw is very important cutting tool, I propose to consider its main advantages.
first and foremost, the most important plus – the width of the cutting tool. And really, it’s hard not to notice that it is much less than disk tools. And if the budget cutting wood this point a mere trifle, for cutting precious woods and high-end material is better to use, for obvious reasons, the band saw.
and then, in addition, the band saw cutting any possible blanks. In addition, the tool has a decent speed and a high cut surface quality.
But, of course, to experience all those advantages must take a responsible approach to sharpening and wiring band saws.
material for the manufacture of saws
Band saw for wood made of tool steel with a hardness of 45 HRC, and for metal based steel V2F, 9KHF ,C75, Uddeholm UHB 15, etc., for carbon steel based cutting tools tool steel, while being hardened teeth which are used for high-frequency currents.
I would Like to note that for cutting metal, you can use bimetal saw that after quenching has a hardness of 65-69 HRC.
Having dealt a bit with the materials used to make band saw blades, gradually move to the teeth of cutting tools and their sharpening.
the Teeth and sharpening angles
band saws different geometry of the teeth due to various types and properties of processed material.
If you consider wood, the teeth are divided into:
- — joiner;
- — for log cutting.on
as for the sharpening angles, then the manufacturer determines this parameter. Basically, it is accepted that the harder the material the lower the cutting angle.< / span>
For band saws for metal, the teeth are usually in the form of a standard or positive rake angle. This point will clarify a bit: the standard form of the teeth is used to cut thin-walled material and shape with positive rake angle, as already easy to guess, for cutting thick walled material.< / span>
I Propose to look at a small picture that can explain what the profiles of the tooth can byt, and where they, these same profiles are applicable.on
in Addition, an important step teeth. So, for example, for thin material you must use a tool with a small number of teeth, and Vice versa for a thick-walled, with a large number of teeth per inch.< / span>
Now, look at another picture, where we clearly see what is the difference between saws with variable pitch teeth saws with variable pitch teeth.
Often, saws are doing it with variable pitch, in order to eliminate the resonance effect.< / span>
Next, I propose to see what types of wiring band saws are.< / span>
the Challenge of routing consists in bending the teeth to the side, to prevent compression of the fabric of the tool and reduce friction.< / span>
There are several types of routing:
- — using the classic routing, we obtain the teeth that are folded right and left alternately;
- — using wiring Stripping the original position is held every 3rd tooth;
- — with a wavy wiring each tooth has its own size of limb (and thus wave is formed).
it is Important to know that the divorce is carried out, the bending part of the tooth (one third or two thirds from the top), but not the whole tooth.< / span>
and Then finally we’ll talk about sharpening band saw blades.< / span>
To prevent breaking of the tool during operation, must comply with the rules of sharpening.
the hardness of the teeth will determine the terms that will be used for sharpening. So, tool steel treated corundum circle, bimetal saw diamond or bronze sample. Tool parameters define the shape of round grinding.
Generally, use form:
- — plan;
- — disc.on
Perhaps the only significant disadvantage of this method is that for various drinking needs different circles.
is Characterized by the grinding of the faces of the teeth. Can be done using the machine, then goes again, the selection of the circle. Manual processing is done by the engraver or on a conventional machine in a safe manner, either using a needle file (its essence – to make a few moves at the front or back surface of the teeth)
to sharpen a band saw with your own hands, you must:
— eliminating the strong push of the circle;
— to ensure uniform removal of metal at the tooth profile;
— to ensure the safety height and also tooth profile;
— control no burrs;
— use the coolant.
in the presence of notches on the surface of the tooth, the saw will be quickly blunted. Therefore, it is important to have a smooth surface of teeth. It is also necessary that the radius at the base of the tooth remained. This is necessary to prevent the occurrence of cracks and breaking of the canvas.
the Saw should be sharpened as soon as there is a lot of force to move it to the wood. Most woodworkers will gladly totocat tool, but can and to seek professional help, if required separation of the teeth. To do the divorce goes through 4-5 sharpening or if the saw leaves from намечеиноzо the direction of wrong of divorce. Teeth, hardened electrically, hand sharpening is not a subject, and blunted replacement blades for thin work are simply thrown away.
Files for sharpening saws
the Cutting edge of each tooth via a triangular file. The file side should be approximately twice the tooth.
Guiding device for sharpening saws
This device guarantees the uniformity of the angle and depth of grinding tenoning and other manual saws.
the Mandrel for separation of the teeth
the Mandrel for divorce rejects the tip of the tooth at a specified angle. The convergence of the arms pushes the plunger which presses a tooth of the abutment with the slope. The emphasis has graduations indicating the size of the tooth, which corresponds to a particular angle of a divorce. A saw with fine teeth is recommended to breed from a specialist.
the Clamp for sharpening saw blades
When sharpening the saw should be securely fastened, otherwise it will be noisy and vibrate to knock the file out of the recesses between the teeth. Make an impromptu clip of the two cut length of cloth bars, with form to pass the handle. Clamp the saw between the bars in the workbench Vice. If necessary, with one end at the clamp.
Handling tops of the teeth
Thorough treatment of the tops of the teeth with a file is absolutely necessary for height adjustment, if the saw has been damaged or clumsily sharpened.
Such an operation in a lightweight form before sharpening forms a small bright spot at the tip of each tooth, which will be invaluable for uniform sharpening. Make a device personal by placing a file in a slightly converging groove in a bar of hard wood, and secure it with a wedge. Move the bar-clamp on a lateral side of the cloth so that the file was moving along the tops of the teeth. Two or three of light speed should be enough to prepare for the sharpening of saw teeth in good condition. If your saw will require serious treatment in order to all the teeth received a brilliant spot, contact the specialist who will give them the desired shape before the divorce and sharpening.
separation of the teeth of a saw
If the saw starts to bend or get stuck in the kerf, make a new separation of the teeth. Prepare the frame: loosen the lock screw and turn the focus by aligning it on the specified size of the tooth (corresponding to your pile) with the mark on the fixture. Tighten the lock screw, make the divorce each tooth that needs to be rejected from you. Flip the saw and repeat with the other teeth. Check whether you have missed some the teeth, holding the saw at eye level the teeth themselves.
Sharpening with a file
Install the saw in a vise between the two bars so that the side teeth were slightly on top, and the handle was right.
Holding the tip of the rasp with your free hand, start with the end of the canvas, emphasizing a file in a first deflected from you the tooth, opposite the leading edge of the neighboring tooth is tilted towards you.
For longitudinal saws install file in the corner of blennie between the teeth at a right angle to the blade and horizontally. Make 2-3 progress Napili kom (putting pressure on it only the first move) until half of the shiny spot on the top of the tooth. Moving toward the handle, sharpen every second tooth. Flip the saw and repeat their actions from the end to the handle, shpilevaya remaining cavities until the disappearance of the shiny spots and the appearance of sharp ends.
cross Sharpen the saw in the same way, but when the file tip towards the handle by about 65° relative to the canvas.
the Parallel lines below 65° at the clamping bars will help to keep the right direction of a file.