Cutting rules
Basic rules to apply when cutting sheet metal with hand shears:
- When marking the part that needs to be cut, it is necessary to provide for an allowance for subsequent processing.
- Position the sheet to be cut strictly perpendicular to the tool blades.
- Cutting should be done in mittens with sharpened scissors.
- To avoid tearing the metal, it is not necessary to reduce the device completely at the end of the cut.
- It is necessary to tighten the screw axis if the tool starts to wrinkle the workpiece material.
- If it is difficult to press on the handles of the device or the thickness of the metal is 0.5 mm or more, you need to fix one of the handles in a vice.
- The size of the "gouge" in the corners should not be more than 0.5 mm.
- If you need to cut a curvilinear part, first, a blank is cut with a straight cut with an allowance of five to six millimeters, then the part is cut clockwise according to the marking.
Compliance with safety rules during work
Before you start cutting metal, you must prepare special clothing to protect the most vulnerable parts of the body. Do not under any circumstances start work without special construction glasses. They will help protect your eyes and the area around them from small chips.
Also, you should have cotton gloves to help prevent the scissors from slipping out of your hands while you work. Try to keep your hands and feet away from the tool while cutting. Otherwise, if you move awkwardly, you could injure yourself on the incisor.
Cutting for metal is a difficult and traumatic job that must be properly prepared for. First of all, the master must choose a suitable tool for himself, which should be not only convenient, but also safe to work with. Despite the fact that hand scissors are the most primitive version of such a tool, you should not give up on them. If you have to work with a small volume of metal products that are thin and made of low density alloys, then this tool is ideal for you for this task.
It's another matter when you need a tool to cut harder metals. In this case, you should think about purchasing scissors equipped with an electric or battery drive. Be sure to consider the possibility of connecting the tool to a power source. If you have any problems with this, then it is better to purchase a model that runs on rechargeable batteries: they are more convenient and will allow you to quickly and efficiently do the job.
Don't forget about safety rules. Do not get too close to the working tool, otherwise you may be seriously injured. And in any case, do not start cutting metal products without special clothing. Remember that this is a traumatic tool that can be harmful to health even with strict adherence to safety measures.
Benefits of using scissors
Why do professional roofers and tinsmiths prefer to use scissors over a grinder? The answer lies in the peculiarities of processing sheet material, where the use of a mechanical tool has undoubted advantages:
security. Vibrations during grinding with an abrasive disc can destroy the disc. The tool can be pulled out of the hand and injure the worker. You can spoil the workpiece itself;
preservation of sheet metal characteristics. Wall, ceiling panels, roofing materials have a decorative paint and varnish and anti-corrosion coating.Under the influence of high temperature, during the operation of the abrasive, it burns out a millimeter or more from the edge, which reduces the performance of the product;
low price of the product. Good professional hand-held metal scissors are cheaper than a grinder. In addition, there is no need to regularly spend money on consumables;
autonomy and mobility. The scissors do not need a power source. You can work with them everywhere. You don't need a lot of space during transportation;
speed of work. A professional power tool cuts faster than its electric competitor.
For large volumes of work, you can purchase professional manual hydraulic shears for metal, which reduce the complexity of the operation. The master does not need to exert physical effort to quickly and efficiently make the desired product.
Such a tool is especially valuable when high-strength steel is used. Such products are more expensive. But experts are well aware that every ruble invested in equipment pays off handsomely.
Photo of scissors for metal
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Cutting process principle
In plumbing, cutting is called cutting the metal, as well as separating the workpieces from it in parts. This process can be done with scissors. A blank sheet is located between the blades of the tool. Under the pressure of the upper knife lowered onto the sheet, the metal is cut. The sharpening angle of the knife blade depends on the hardness of the metal. The harder the metal, the sharper the blade should be. The sharpening angle is:
- for soft metals - 65º;
- with medium hardness - 70−75º;
- for hard metals - 80−85º.
In order to reduce the friction of the knife blades, the clearance angle should be between 1.5º and 3º.
The knives of the fixture are made of alloy steel. The side surfaces of the blades should be hardened, sharpened and ground.