6mm thick steel plate, cut about 5cm length. Is the angle grinder safe to operate? Will there be bursting and splashing of the grinding wheel? How can I use an angle grinder for the first time safely? What are the precautions?

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It can cut, but protective measures must be taken to install a wheel cover on the angle grinder. When using an angle grinder, it is best to wear a protective mask, gloves, etc. When cutting metal objects, be sure to fix the metal objects and hold the angle grinder with both hands. It is recommended that novices do not use for cutting. It is safer to use a cutting saw blade.
1. Wear goggles.
2. Be sure to hold firmly. And there must be a protective cover, and the position of the protective cover should completely isolate the hand and the slice (meaning that the body of the angle grinder will not be touched by any sliding movement with a handshake). Pay special attention to that the shield does not protect the eyes, and the shield does not restrict the direction of Mars. Don't think too much about its functions the first time you use it, it just protects your hands.
3. Cut other points at will and practice first, choose the most comfortable position to cut the parts you want to use.