Grandi Liutai Italiani,
5/
5
<p>This set of ISI SHARP chisels is a solid basic equipment for every woodworker. The carbon steel blade (T10) is hardened to 61 - 63 HRC. The ash handles are without impact ring, so that the irons can be more comfortably guided by hand or struck with the heel of the hand. Even without an impact ring, the ash handles can withstand light to medium blows with a mallet. The handles have a colorless matte finish and are slightly flattened on two sides to prevent rolling.</p>
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<p>Iron widths in the set: 6, 10, 12, 16, 20, 26 mm</p>
<p>Bevel angle 25°</p>
<p>Total length, depending on blade width 250 to 270 mm</p>
<p>Blade length measured without tang, depending on blade width 97 to 105 mm</p>
<p>Handle diameter 29 mm</p>
<p>In Original wooden case</p>
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<p>The Patented ISI SHARP:</p>
<p>The face of a chisel must be flat in order to make precise wood joints. Most woodworkers are familiar with this fact. However, you may have experienced that it is not so easy to produce or maintain such a precise face on Western chisels.</p>
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<p>The face of a Western chisel is relatively long, usually between 100 and 120 mm. When the entire length of the mirror side is honed on a flat waterstone, it bumps and lifts at the transition to the tang. At this moment, the honing stone has contact with the iron only at the cutting edge and at the tang. This means that the objective of achieving a flat mirror surface is not realized. In practice, therefore, only the part of the face close to the cutting edge is honed. However, it cannot be avoided that the face of the mirror becomes rounded over time, since there is no defined end of the grinding surface towards the tang side. Precise work is therefore only possible to a limited extent.</p>
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<p>Why do Japanese chisels not have this problem? The face of Japanese chisels is short, often only 60 to 70 mm. In addition, due to single or multiple hollow grinding (Ura) of the face of the chisel, the area that has to be removed is considerably reduced. The third and decisive advantage is that the tang is angled with respect to the longitudinal axis of the face of the iron. This means that the sharpening or honing stone only touches the surface of the mirror side, which is limited on all sides. The result is a permanently flat mirror side.</p>
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<p>The basic idea behind the isi sharp chisels is to transfer this advantage of Japanese chisels to Western chisels.</p>
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<p>First of all, the question remains to be answered as to why Japanese chisels are not used instead of Western chisels. The answer: Many Western woodworkers find the Japanese chisels too short. Not everyone likes to get used to the angled handle.</p>
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<p>The face of the isi sharp chisel chisel4 is designed as a flat surface in its part close to the cutting edge up to a length of approx. 70 mm. The novel feature is that the remaining surface is recessed by 0.5 to 0.6 mm up to the tang. This means that the surface to be ground is clearly defined on all 4 sides and reduced to the length of a Japanese chisel. This also means that the result is a permanently flat face of the chisel. This invention originates from Friedrich Kollenrott and is registered as a utility model at the German Patent Office.</p>
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025.312
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