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Jigsaw blades have a single row of teeth along one edge of the blade, these are arranged in a small wave pattern from left to right- a blade with 21-24 tpi is recommended for cutting metal and one manufactured with a bi-metal construction will offer the best durability. Working with a jigsaw on metal certainly involves some risk, so here are a few ways to be sure your project is successful and without any “ouch!” Possible other options: cutting oil, thin plywood, drill with a metal pilot bit large enough to fit your jigsaw blade for internal profiles. You can use a jigsaw to cut sheet metal and metal pipes made of cast iron, steel, copper, aluminum, brass, etc.
Keep plenty of extra blades on hand, as cutting metal will degrade a blade faster than cutting a softer material like hardwood.
The body of a bi-metal blade is made with spring steel or flexible carbon steel. But the cutting teeth are made of hardened high-speed steel that is welded or diffusion bonded onto the softer body. So the blade can cut harder materials without wearing down as fast. This combination of a flexible body and hard cutting teeth makes them last almost ten times longer than blades made from high-carbon steel and 2 to 5 times higher blade life compared to regular HSS blades. Tungsten Carbide Blade
You definitely need specific, potentially expensive blades for metal, all-purpose blades won’t work. Jigsaws are awesome, versatile tools. They can make tight, precise cuts, and long straight runs with no distinction from a circular saw’s cut. When switching your blade to a metal-specific one, make sure that your tool is set for the blade to cut straight and not angled from a previous project. Additionally, make sure your speed is set to slow. You will get the best results from your jigsaw and blades by cutting metal slowly and steadily. Limitations of Jigsaw If starting the cut at the edge, press the saw shoe firmly on the surface of the workpiece without the blade touching the metal. Slowly depress the trigger and once the blade is moving, glide it into the workpiece. It is important not to force the speed of the cut and just let the blade do the work. If starting the cut away from the edge of the workpiece, simply drill a hole large enough to insert the blade in and continue as above. Securely clamp the workpiece to the work bench. If there will not be sufficient depth clearance for the blade, the metal can be placed on rails and then clamped to ensure blade clearance. Some metalworkers ‘sandwich’ the metal sheet between two thin sheets of wood to add support while cutting- this technique will take longer but will help minimise distortion on soft or thin metal.Tungsten carbide, which is produced by sintering tungsten and carbon atoms, is a much harder material than steel. A tungsten carbide jigsaw blade is made of a steel blade with tungsten carbide grits on the cutting edge. If you have ever attempted to cut thin sheet metal with a jigsaw, you might have noticed excessive vibration, and in some cases, the sheet may get bent and damaged. As with most cutting tools, the type of blade you use is possibly the most important factor in how efficient your cuts will be. Whether cutting curves or lines with a jigsaw, ensuring you have the right blade for the application is essential for making clean, safe, and effective cuts. Specific materials require different types of jigsaw blades, including those with varying tooth pitches, sizes, and orientations. For example, blades with fine teeth are ideal for cutting metal, while those with larger teeth are more suitable for wood. Having the right blade for the material you’re working on will always ensure for maximum cutting performance. When cutting a flat sheet of steel or other metal, it’s often recommended to sacrifice a few thin sheets of plywood to sandwich the metal. This creates a more controlled and thus smoother cut by minimizing vibration and keeping the material flat. Metal Cutting Tips
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