This is a knurling tool. Its purpose is to press patterns onto metal to improve grip or surface texture. A straight knurl makes parallel lines, often used on knobs and handles. But when you switch to a toothed rolling tool, the metal can be pressed along a thread path to form the actual threads on bolts — a process called thread rolling, which makes the threads stronger and more durable than cutting. | Great leader

"Knurling, cut knurling specifically. Traditional knurling uses two rolls to compress and form the diamond pattern into the material. Cut knurling uses two rolls set at an angle to physically cut the knurling into the material. By threading the blanks onto the fixture I can leave the tool setup (which can be a bit tedious to get it set perfect) and run blank after blank with consistent results." Credit: IG User hillview_wm | Practical Machinist

Knurling Knurling is a great way to provide additional texture or an attractive finish to a surface. Typically produced on a lathe, the texture is created when a pattern of straight, angled, or crossed lines are rolled or cut into the material. Knurling is not limited to lathe processes only. As you can see from this video, knurling can be installed in many ways. The most common application is rolling. Hardened wheels are pressed into the softer material with extreme force. This force displaces

Tecniche di zigrinatura | Meccanica News