Geometric features can be divided into the following three parts. Length The ratio of length to diameter is called double diameter, and the smaller the double diameter, the better the rigidity. Choosing a drill bit with a blade length that is just enough to remove chips and a hanging length that is as short as possible can improve the rigidity during machining, thereby increasing the service life of the tool. Insufficient blade length is likely to damage the drill bit.
Drill angle A drill tip angle of 118 ° may be the most common in machining and is typically used for machining soft metals such as low-carbon steel and aluminum. This angle of design usually does not have a self centering function, which means that it is inevitable to first process the centering hole. A drill point angle of 135 ° usually has a self centering function, as there is no need to process the centering hole, which will make drilling the centering hole separately no longer a necessary process, thus saving a lot of time. Spiral angle For the vast majority of materials, a helix angle of 30 ° is a very good choice. However, for environments that require better chip removal and higher cutting edge strength, a drill bit with a smaller helix angle can be chosen. For materials that are difficult to machine, such as stainless steel, a design with a larger helix angle can be chosen to transmit torque.
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