Single Point Thread Mill3/16/2021
A Threadmill can be small, delicate, and expensive, so its no fun to break one.On lathes, single point threading (turned threads) and taps are used.The popularity of these methods is Tapping, Single Point Threading, and Thread Milling in that order.
Removing broken taps is painful, especially if the tap is embedded in a part thats already been machined at considerable expense. Thread milling is often preferred for expensive components and late stage machining for this reason. Their use in hard materials is another reason theyre almost always carbide. There is also savings in reducing the amount of tooling inventory that must be kept on hand for standard thread sizes. This is an advantage on CNC Machines that lack rigid tapping capability. At some point, threadmill cutters are cheaper than very large taps. Exceptions would be stainless steel (reduces work hardening), aluminum (reduces chip welding), and cast iron (to keep the dust down). They need the extra rigidity and strength to do their job versus HSS. You may only need a single pass for all threads in the hole if the thread length is the same or less than on the threadmill. A Multi-form threadmill thus cuts faster than the Single Profile or Single Point threadmills we will look at next. Therefore, they can be used for a wide variety of threads by varying the depth of cut and the pitch of the thread helix. But a Spiral Flute Thread Mill can only do one helix pitch because the distance between teeth is fixed. A variety of types are available including Single Profile, Single Insert Spiral Flute, and Multiple Insert Spiral Flute. However, as is the case with most indexable tooling types, the geometry and therefore the performance of equivalent solid carbide tooling is superior. Therefore, an indexable threadmill is only preferred when doing large volumes of threading in relatively larger holes. But, if those are not at issue, a Spiral Flute Thread Mill will generally cut faster as well as spreading wear over multiple flutes so the tool lasts longer. Coatings can reduce that wear and are worth investigating on those materials. Theyve also got support lines where you can call up and get a consultation. Be sure to take advantage of these resources to help you choose the best cutter for your job. If you plan to use a set-screw holder, make sure your Threadmills have the Weldon Shanks that maximize the effectiveness of the holder.
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