![]() ![]() Nor will we cover thread milling’s alter ego, single-point threading, a process commonly used to produce internal and external threads but which can only be performed on appropriately equipped lathes. There’s no room to talk about thread rolling, chasing, whirling, or other threading methods, all of which are limited to external fasteners-screws, in other words. What we will discuss are the two primary approaches to making internal screw threads- tapping and thread milling-and when to use one over the other. Coarse and fine, left or right, tolerance classes, form, angle, and pitch-we won't attempt to explore the near-encyclopedic amount of screw thread terminology or all the many types of threads in use today, except to say that most have a 60-degree form and fall under the metric or Imperial measurement system. Threads and threading is a complex subject. ![]() Threaded fasteners hold the world together. So would bicycles, computers, refrigerators, and virtually every other modern electromechanical device. ![]() Since the dawn of electricity, though, we've used pumps to move fluids, which would be impossible or at least very difficult and expensive to manufacture without threaded fasteners. Historians will tell you that the screw thread was invented more than two millennia ago and was originally a means to bring water to thirsty crops and people. ![]()
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