A Brief Introduction of Twist Drill
Because of the low price, low maintenance and ease of use, the twist drill has been widely applied in every walk of life. If the bits
spray gun of twist drills break or run out of the use, there is no need to repair or sharpen them because they are very inexpensive. It will cost a lot in time, energy and money when replacing it. It is also very convenient for a lot of people to use twist drills without any kind of special training. A majority of the modern drills are electrical and motorized, and users just keep the drill straight and
impact wrench pointed in the right direction without any efforts.
According to the specific purpose they are to be used for and the kind of material they will drill through, twist drill bits are designed into different models. The angle of the point of the bit is especially important.
Most drill bits have a 118 degree angle at their tip; this angle is suitable for drilling through most materials fairly effectively. Wider angles, often around 150 degrees, are used for drilling through tough materials such as stone and metal. We often choose a twist drill with sharper
air nailerangles around 90 degrees to drill through soft materials such as soft wood or plastic.