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I am planning to repair the apartment. A construction knife is useful for cutting different materials. How to choose it? Juris Rēzekne asks.
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A construction knife is an indispensable tool for craftsmen and those engaged in repair work. With such a knife, you can easily cut cardboard, softer plastic, linoleum, polystyrene foam, bitumen shingles and soft corrugated roofing sheets, polycarbonate, plasterboard. A high-quality construction knife will last a very long time, just replace the worn blades.
However, no matter how high-quality the tool is, it will not last forever. On the other hand, if used incorrectly, the knife will be damaged already after the first use.
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The body of these knives can be made of both metal and plastic. The metal case will be more durable, but the plastic one will be more compact and lighter.
One of the most important parts is the guide in which the knife blade is inserted. The guide prevents the knife blade from coming out of the housing.
The smaller the free movement of the blade in the guide, the better the quality of the knife and the longer it will last.
But there are also knives with a disc-shaped blade or construction knives scalpels. There are also construction knives specifically for painters, which can also be used as scrapers. There are also knives intended for cutting thermal insulation materials, knives that can be used to cut a circle of the desired diameter, and others.
Spare blades are made of carbon fiber or high strength steel. Some manufacturers also offer ceramic blades. Their use is not too wide, but they are very sharp, but fragile.
Blades of the classic shape are most often used. Their width is 7–10, 15–18 or 20–25 mm, length – 100–200 mm. Blades up to 50 mm long are considered short, blades over 200 mm long are considered long. Depending on what material the blades are intended for cutting, their thickness is 0.3-2 mm. Wide blades will be more durable. On the other hand, knives with narrow blades will be suitable for one-time use, for example, for cutting wallpaper or paper.
The blade locking mechanism is also not insignificant. It is important that it is reliable, while providing the ability to easily fix the required blade length and replace the spare blade.
The tool must be balanced, it must fit comfortably in the hand. A light knife will be more convenient, but it should not be fragile.
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The plastic guides that hold the blade can break the first time you use it if you have to force it on the knife. Such a knife is used for cutting paper and other less durable materials. Also, the fixing screw of the knife blade will be more durable if it is made of metal. A stainless steel knife will last a very long time.
Blades must be stored in suitable conditions. They are usually packed in plastic cassettes and lightly oiled. It is best to buy high-quality products from recognized manufacturers.
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2024-01-01 19:21:30
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