An angle or hand grinder is a power tool regularly used by construction workers and contractors. It is also an invaluable tool in the home workshop or around the house, with a multitude of uses for DIY and crafts. As the name suggests, it can be used for grinding and cutting but also sanding and wire brushing. Like any power tool grinders it can also be dangerous if used incorrectly.
Plenty of manual cutting applications call for a hand-held grinder and cutting wheel. Cutting sheet metal, sizing a piece for fabrication, cutting out a weld to re fabricate it, and cutting and notching in pipeline work are just a few examples of what can be accomplished using a grinder and cutting wheel.
Use of Angle Grinder:
A grinder is useful for cutting and grinding
- Iron, steel and other metals
- Metal roof cladding, corrugated iron and other steel sheeting
- Brick, stone and concrete
- Slates and building tiles
- PVC waste pipe
- Rusted bolts which can’t be undone
- Rebar in concrete
- Grinding and sharpening garden tools
- Welds on steel and also cleaning of welds
Sanding and wire brush accessories are used for:
- Removing paint
- Cleaning rust from steel
- Sanding wood
Angle grinders make use of a disk of abrasive material spun at a high rotational speed by an electric motor in order to perform the cutting action.Angle grinders can be powered by compressed air or gas (petrol). An angle grinder can be used instead of a bench grinder for sharpening blades (e.g. a lawn mower blade), plus the consumable disks are much cheaper to replace than the grinding wheel (stone) on a bench grinder.
How to cut metal from hand grinders:
You can cut most metal with a hacksaw. But for quick, rough cuts, it’s hard to beat a grinder. You can use an angle grinder to cut rebar angle iron, rusted bolts (and welded wire fencing. Use an inexpensive cutoff wheel for these and other metal-cutting tasks.
Steps to cut metal:
Use compound snips to make small cuts in thin-gauge steel
- Choose a nibbler to make longer cuts in thin-gauge steel.
- Use an angle grinder fitted with a metal cutoff wheel for rough cuts.
- Use a hacksaw for simple, shallow cuts.
- Use a bench shear to easily cut most gauges of sheet metal.
Proper Positioning and Other Tips:
You should follow these tips when using abrasive cutting wheels.
- Use the hand grinder at a 90-degree angle, perpendicular to the work surface.
- Apply the proper amount of pressure—not too much, not too little—to allow the cutting wheel to do the work. Always avoid pushing too hard on the wheel, which can cause the grinder to stall or kick back or give you a much less efficient cutting action. It also increases the chances that you will slip or lose control of the tool, which can cause damage or injury.
- Choose a tool and consumables that offer quick, consistent cutting, which typically provides the most efficient performance.
- Remember, if you lean too hard on a wheel, which can cause the wheel to break or jam in the cut. It can also reduce the efficiency of the wheel and increase the cut time.