A spoke threader is used to cut threads at the end of a metal spoke to attach a spoke nipple. The machine is secured to a stable support, and the spoke is cut to the correct length before being locked in place and cut by the threader. The spoke is then ready to be used on a bicycle wheel.
Most bicycle spokes have pre-cut threads to help secure the metal holder to the bicycle rim. Sometimes, however, you may need to cut a spoke to a specific length to fit a rim. In this case a spoke threader will be needed. This machine allows the user to cut the threads at the end of the metal spoke so that a spoke nipple can be attached to it. A spoke threader features a crank that turns a sharp point, which in turn rotates around the outside of the round metal spoke.
In most cases, the spoke threader is secured to a bench or some sort of stable support to prevent excessive movement during the cutting process. A spoke is passed through one end of the machine and locked into place to prevent it from spinning during the cutting process. Before being secured in the spoke threader, however, the spoke is cut to the correct length using a spoke cutter or saw. The end is usually filed down to also get rid of any burrs or sharp edges. Once locked in place, the spoke is ready to be placed inside the cutting tip.
The user will place the tip and tighten it around the end of the metal spoke. The cutting elements will then be in position to make the right amount of cut; in some cases, cutting fluid may be applied to the bit, although this is not always necessary. The user will turn the crank in the correct direction and the bit will begin to rotate as it cuts. Once the user has rotated the spoke threader handle to cut to the desired depth and length, the bit can be loosened and the spoke unlocked. The spoke is then ready to be used on a bicycle wheel.
The spokes are threaded at the end to allow for the application of a small nut called a nipple. This is placed outside the circle; it is slipped through a hole and one end of the nipple is large enough to prevent the rest from falling through the hole. Once the spoke has been laced through the wheel hub, it is attached to the nipple, which rotates and attaches to the threads cut into the spoke by the spoke threader. As the nipple is tightened, more tension is given to the entire system, which will affect the straightness, or exactness, of the wheel.
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