A bigger wheel means you’re grinding a larger surface area which means you can get large jobs done faster. If you’re cutting, a bigger wheel may also mean a deeper cut. In contrast a smaller wheel spins at faster speeds but may be prone to overheating.
This refers to revolutions per minute when the grinder is spinning freely. Grinders that can adjust this speed tend to be more versatile. Harder materials or larger wheels have to be worked at lower speeds. Conversely, softer materials and smaller wheels can be used at higher speeds.
Typically you can choose between a trigger, paddle or slide switch. Trigger and paddle switches disengage if the user’s hand is removed. The choice of switch not only impacts safety, but also hand position and comfort.
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