There is no screwdriver with round head because the round head has no torque.The flat headscrewdriver is to ensure the torque, and the Phillips screwdriver can distribute power uniformly.According to the power source, screwdriver can be divided into manual screwdriver and electric screwdriver; According to the shape of cutter head,it can be divided into flat head screwdriver and Phillips screwdriver. The cutter head ofgood quality screwdriver is made of spring steel with relatively high hardness.A good screwdriver should meet thedemand of appropriate hardness and toughness.When the groove of screw head goes bald, we can use a hammer to hit a screwdriver, and then the groove will become deep, and it will be easy to twist the screw out, but the screwdriver should be unscathed. A screwdriver is often used to pry the things, so it requires certain toughness.Generally speaking, the screwdriver head hardness should be greater than HRC60, which is not easy to rust.
Maintenance measures:
(1)The screwdriver blade must be ground correctly, and both sides of the blade should be parallel as far as possible. If the blade is tapered, during rotating the screwdriver, it will be extremely easy to slip out of the screw slot.
(2)The screwdriver head don’t need to be ground too thin.
(3)When using the grinding wheel to grind screwdriver, we should be particularly careful because it is overheat to make the screwdriver edge soft. During grinding, we need to wear goggles.
