With forming, the tap rolls the material, producing a rabbit ear-like shape that includes a gap rather than a flat surface. And while it can be used for most industries, the food, medical, and aerospace sectors are exceptions.” “However, there are some limitations, like it does require more spindle power. “It's also a stronger thread,” said Haid. It also tends to be much more accurate, producing the correct tolerances. With no chip production, this forming tends to offer a higher level of safety and productivity. “Chip evacuation can be a big challenge when threading, especially in deep holes, so not having chips is a strength of this method.” “One of the biggest differences is that forming taps do not create chips,” said Kyle Matsumoto, product engineer, OSG USA, St. Instead of cutting the threads, forming taps displace material flowing into the gaps of the teeth as opposed to cutting them.”Īnd while the cutting methods tend to be the most popular, thread forming does offer some significant advantages, depending on the application. “Most people think that you have to use a cutting tap in a hole. “It's very hard to entertain the idea of switching to thread forming if you’re not familiar with it or haven't been introduced to it in the past,” said Matthew Haid, application specialist, Dormer Pramet, Elgin, Ill. The three common methods for threading internal holes are tapping, milling, and forming. One misstep and the entire part could be scrapped, and no one wants this. This is why it is imperative to thread correctly. This part of the process takes place late in the game, often after quite a bit of work has been done to bring the component to near completion. Emuge Corp.Ĭreating threads is a common practice in many machine shops. With forming, you have to control two dimensions simultaneously, which are the minor diameter and the pitch diameter.
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