- Cut to the claw
- Machine cutting
- Using a pipe cutter
- Cutting at the nibbler
- Cutting with straight-nose shears
- Sheet metal shear cutting
- Cutting with shears
The metal is often in sheets a few tenths of a millimeter thick called "sheets" for various uses (doublings, forms, boxes, etc.). Their cutting is done with cutting tools of different types depending on the metal, its thickness and the shape of the cut. Unlike sawing, this usually involves deep scratching of the metal to incise and weaken it on the cutting line.
Cut to the claw
Tough metal sheets such as zinc and aluminum can be cut at the claw, especially for straight cuts. The claw consists of a simple blade, hard, often crooked, mounted at the end of a handle. Once the tracing done, put a metal ruler on the plate and notch the metal by pressing on the edge of the ruler. It is necessary to press strongly, sometimes several times, to dig a regular clear furrow. After the passage of the claw, the metal carries a triangular bleeding. It is then enough to fold to separate the two parts of the sheet. Always pull the claw towards you and not push it, which gives more strength and avoids any slippage.
Fast cutting of certain metal parts such as bars and profiles is usually done with a grinder equipped with a cutting disc. This power tool allows both abrading and cutting. The machine is held with both hands, one on the body of the device, the other on the side handle. Motor rotation (more than 6,000 rpm empty) is high. The workpiece must be securely fastened to prevent projection by the rotation of the disc. Wear eye protection to prevent splashes of metal or abrasive particles. The angle grinder is very useful for removing rusty nuts that can not be unlocked with the key.
Using a pipe cutter
The cutting of soft metal tubes - copper in particular - can be done according to the principle of scratching applied to a round bar. The tube is caught between a wheel and a rotating blade in a kind of vise with two jaws: one fixed, with rounded hollow profile so that the tube is supported without deformation, provided with a flat wheel; the other mobile, equipped with a very hard cutting rotary blade (tungsten carbide). The tube being placed on the fixed jaw, the movable jaw is pushed against the tube with a screw. The tube cutter being held by its handle, it is rotated around the tube. The knob is tightened on the tube and a new turn is made; and so on until the copper is completely cut. There are also chain models for large diameters. The small pipe cutters have a trimming iron on the upper part which serves to rid the inner perimeter of the tube, after cutting, all the metal plots (the "barbs") so that the cut is clear. Without deburring, the subsequent assembly would be less solid, and the plots of metal would catch the impurities carried by the water, potentially causing, in the long term, clogging.
Cutting at the nibbler
The sinuous cuts are made at the nibbler. The tool has two branches, like a shear, and is maneuvered in a comparable way. The cutting iron loosens a tiny band of metal that wraps around itself. We adapt the iron of the nibbler to the work to be done. His change is fast and easy. A nibbler also allows straight cuts, without deforming the piece of metal. It is ideal for cutting irregularly shaped pieces or for making windows in a stovepipe. For this, first drill a hole on the perimeter of the circle to remove to engage the iron of the nibbler.
Cutting with straight-nose shears
The straight-nosed shears are used to cut metal strips of small width. Cutting the sheet is done with the back of the nozzle, which requires less effort and does not risk damaging the metal.
Sheet metal shear cutting
Sheet metal shears are used for length cuts. The narrow band of metal bends itself under the effect of the blades. You can rest the spout on the table or work by hand. The sheet of metal must be well immobilized.
Cutting with shears
The shearing shears can cut circles. Some cut to the right and others to the left. The work of the jaws of the shears tending to deform the leaves, it is necessary to plan to put the piece back into shape.
(photos / visuals: © DIY-prod, except special mention)
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