It´s not all "just steel"
The most diverse areas of work require their own individual range of steel qualities. This guarantees the best possible material performance over long life spans. For this reason, the choice between CV, HSS, Bi-Metal and HM models must be carefully evaluated according to the intended purpose of use.
High-alloyed Chrome Vanadium steel is used for work on softer materials such as wood, fibreboard and synthetic materials.
High Speed Steel, hardened in a vacuum furnace, is used for work on harder material such as metal (iron and steel), aluminium and nonferrous metal.
Carbide, high abrasion resistance = longest life. HM blades are suitable for all areas of use.
Bi-Metal 65-67 HRC. The perfect combination of flexibility (due to the spring steel which despite bending, always returns to its original form) and durability, thanks to the HSS strip alloyed with Cobalt, which is welded on. Bimetal is heat treated in a vacuum furnace. Suited to work on wood and metal.
The tooth spacing “T” is the distance in mm from the point of one tooth to the next. Sometimes the tooth spacing is given in inches. E.g. 14 teeth/inch correspond to a 1.8 mm pitch.
Why are so many different blades required?
The reasons for needing so many different blade types are naturally numerous. The material to be sawn plays a particularly important role. Whether it is a hard material such as iron, Nirosta steel (stainless steel), hardwood or tile or, a soft material like softwood, plywood, synthetics or cork that is being sawn, determines what material the blade should be made of, what strength of teeth and which tooth geometry are most suitable.
The second factor to be considered is the thickness of the material which determines the length of toothing on the blade. The cut-quality desired also plays a pivotal role in this decision-making process. Here, the appropriate blade is determined depending on whether a rough cut is sufficient or if a finer cut is required, whether angle precision is necessary or if contours or curves are being sawn. One further aspect of the material, which can be a decisive factor, is its form, e.g. metal profile or material combination – the so-called sandwich material.
How to use a Jigsaw?
The jigsaw works along the same principles as a sewing machine. The cutting speed of the upwards/downwards movements can be adjusted in degrees or can be regulated electronically. The cutting speed ranges from 200 to 3000 cut/minute.* When using harder materials, for example metals, lower cutting speeds are used. With softer materials like woods, higher cutting speeds are more appropriate.
The clamped sawing blade is designed to cut during the upward movement. This is aided by the so-called pendulum cut. The pendulum cut ensures that the blade is pressed against the material with extra force during the upward movement. In this way, it is possible to saw faster, while using the same amount of energy.
During the upward movement the blade is automatically drawn slightly from the material. These movements together produce the pendulum motion (pendulum cut).
* Determined by machine and manufacturer.
Specific cutting techniques for optimum cuts
Very Clean Cut
The wood grain is cut by the slanted angle of the tooth. CT ground edges don’t come in contact with the saw kerf and therefore produce extra-clean cuts.
High Speed Cut
The angular-sloped tooth cuts the wood grain. CS-ground teeth give the blade an extra high cutting-speed.
The wood grain is ripped and the saw set moves upwards and downwards in the saw kerf producing a rough cut.
milled, wavy set
The cut takes place on the entire surface of the tooth. The only difference is in the tooth formation.
D = Roof Tooth
P = Positive Tooth
N = Normal Tooth
The sawblades of the Variozahn-System have unevenly spaced saw tooth, that means small and large tooth are combined on each blade. As a consequence it is possible to saw different materials quicker and with a cleaner cut than with evenly spaced saw tooth.
What regulates the cut-speed and performance?
- The motor power (wattage) of the machine
- The effort output when sawing
- The quality and accuracy of blade selection
- The accurate selection of pendulum cut.
When using a high pendulum cut, cracks may appear on the cutting edge.