Drilling is a machine process to increase the inside diameter of a hole. The nature of this process is also called internal turning. While the original hole is formed with the help of a drill, it is the drilling tool that does the work! To buy quality used drilling machines, milling machines, you need to consider the following factors: Straightness: Over time, the straightness of the drill head tends to change. While minor inaccuracies in the machine head may still be acceptable, most minor corrections can prevent serious damage and costly repairs. Machine owners who do not pay attention to this rarely maintain their machine. If possible, check the used machine under power in production. Drills, especially the longer ones, tend to run off-centre and tend to cut at a slight angle. Due to