You’ll run out of spots in your tool changer faster with tapping than thread milling on a job that has a lot of different thread sizes. – A different sized tap is required for each type of thread, whereas a thread mill can work for multiple sizes. – Tapping can usually thread deeper holes, particularly in harder materials such as steel. – Tapping can be quite a bit faster than thread milling, particular on a machine set up for rigid tapping. First, we’ll consider tapping versus thread milling for mills: Let’s look at the pros and cons on mills and lathes. Taps are simpler in many ways than the other two types since the tap regulates the motion and the machine just has to be close to where the tap thinks it should be. Otherwise, the tap will be stretched if the downward motion is too slow and the threads outrun the tap or compressed if the downward motion is so fast that the tap is being pushed down faster than the threads allow. It is important that the downward motion of the tap into the workpiece proceed fast enough relative to the rotation of the spindle to match the threads. You’ve no doubt used a wood screw that cut its own threads in the wood as you turned it. Tapping is no different in that motion needs to be synchronized, but the synchronization does not have to come from the machine. You can see the common theme in both cases is synchronized motion in 2 dimensions to create a helix. The cutter describes a helix that is the same as the helix of the thread itself and so the thread is cut. It’s teeth are shaped similarly to the thread form of the thread to be cut. Instead of spinning the part, a thread mill is spun. Thread Milling is the equivalent for a milling machine. That cutter is synchronized to the rotation of the part so it perfectly tracks the helix that is a thread. Single Point Threading is done on lathes, rather than mills, and involves a cutter whose shape is the thread form. Each one has pros and cons and is well suited to particular tasks. There are a variety of ways to make threads on CNC Machines, namely by tapping, single point threading, and by thread milling. Cutting Threads: Tapping, Single Point Threading, and Thread Milling Quick info on CNC Tapping including tap holders, tap collets, tapping attachments, rigid tapping, feeds & speeds, and more. CNC Tapping: Holders, Attachments, Rigid, + Feeds & Speeds
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