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

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Check out how perfect this knurling on this part has turned out. There's a full video how I made it. | my mechanics

Push knurling without tailstock support? Watch that deflection 👀🔧�Knurling puts serious side load on the part—without backup, things start to bend fast. Always support long or thin stock to keep your pattern clean and your part true. A scissor style knurler would be a better option if no tailstock support is an option. #Knurling101 #LatheTips #MachinistLife | High Caliber Craftsman Builds