In addition to complying with the relevant provisions of GB3883, the safety of handheld electric cutting machines must meet the following requirements:
Any mechanism for adjusting the cutting depth or angle must feature a reliable locking system to prevent loosening during normal operation.
The machine must be equipped with a blade guard (made of steel plate thicker than 2mm) that cannot be removed by hand alone. The guard must ensure that the exposed angle of the blade does not exceed 180° to protect the operator from injury caused by blade breakage or flying debris.
Except for Class III machines, the rotor must feature a double-insulation design (i.e., the shaft must be an insulated shaft). Machines requiring grounding must have a reliable grounding terminal; the grounding lug must be silver- or chrome-plated, and the grounding wire must be longer than the two current-carrying wires to ensure the ground connection remains intact until the power supply is cut off.
The outer diameters of the upper and lower blade clamping flanges, as well as their contact surfaces with the blade, must be identical to avoid inducing additional stress on the blade.
The radial runout at the output shaft end must not exceed 0.04mm.
Wet-cutting machines must be powered via an isolation transformer with a rated voltage below 115V; they must also be equipped with a splash-proof housing and use blades designed for wet cutting.
Diamond blades must not be used to cut metal materials; doing so causes overheating, shortens the blade's lifespan, and increases the risk of breakage. Before use, the blade must be inspected for cracks or warping to ensure it is undamaged, and a test run must be performed. Contact between the blade and the operator's hands or body during operation must be strictly avoided.
Reliable auxiliary clamping devices must be used-especially when cutting small pieces of material-to prevent the workpiece from flying out and causing accidents.
