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Metal Thread Tapping Techniques for Beginners
Tapping tools allow metalworkers to create threads within holes in a workpiece. This is necessary for screws and other types of fasteners that help complete the product. Metal thread tapping is a relatively straightforward process, but there are still several tips and best practices that can help ensure efficiency and success in your workflow. Hone your skills with these metal thread tapping techniques for beginners.
Drill the Hole and Select Your Tap
Every tapping procedure begins with drilling a hole for the tap to fit into. While this step is simple, you still need to pay close attention to the size of the hole and the type of tap you need to create the thread you want. You can use a thread gauge to measure and match pre-existing threads. If you’re creating your thread from scratch, use a tap chart to help you pick the right thread tapping tools for the job.
Remember that the chamfer of the tap—which drills into the hole to cut the thread—will be slightly longer than the length of the thread itself. Because of this, you need to make sure you drill your holes to be slightly deeper than your thread length. This gives you space to fully cut the thread.
Clear Threads With Reverse Turns
Once you’ve drilled the pilot hole and aligned your tap, it’s time to start cutting the thread. As you spin the tap to cut the thread, be sure to intersperse short reverse turns. This backs the tap up and helps clear chips and other material flecks that gather inside the cutter as you work. By clearing the cutting teeth, you create a smooth path for the tap so you can continue cutting your thread safely and efficiently.
Use Cutting Fluid
As with many metalworking processes, tapping is much easier—and more successful—when you use cutting fluid. Using metal cutting fluid is one of the most important thread tapping techniques for beginners because it lubricates the tap and helps wash away flecks of material as you work. This creates a smoother, faster cut, improving efficiency and creating higher-quality results. Cutting fluid also helps the tap spin without resistance, which reduces your risk of breaking the tap and ruining the workpiece.