A set of pulleys made up of numerous distinct diameters is known as a stepped pulley. A two- to four-pulley combination makes up the conventional step pulley. With this kind of step pulley, new operational speeds can be achieved on machinery like a drill press by simply switching the belt to a different pulley size. When the belt is changed on one step pulley, it is also changed on the equivalent step pulley on the opposite side of the belt since step pulleys are usually operated in pairs.
The majority of step pulley assemblies are cast from liquid materials; however, some of the very best pulleys are forged from solid billets of steel or aluminum. The billet step pulley spins significantly more accurately than the cast version, but the billet version is significantly more expensive. While this is not a real step pulley, some designs use separate and independent pulleys to assemble the arrangement.
There are certain step pulleys that employ flat belts, even though the majority of step assemblies are set up for V-belt use. This kind of step mechanism, which is present in some milling machines and lathe transmissions, may be switched or altered instantly. The flat belt pulleys run significantly more smoothly than the V-belt type and are typically always made from billet stock. However, because a V-belt can grasp the pulley more firmly, it is preferred in applications requiring higher torque levels.
The ᴍᴇᴛʜod of regulating the speed on a specific step pulley-equipped machine is typically simple once it has been decided that it needs to be done so. Open the belt cover with the motor turned off. Note the location of the belt on the pulleys at the moment. Keep in mind that higher power but less output speed will come from a large pulley driving a smaller pulley. A tiny pulley driving a large pulley, on the other hand, will provide more speed but less power.
The belt cover can be ᴄʟᴏsᴇd and the machine can be restarted once the ideal pulley system has been identified for the intended outcome. The machine may now be run at the correct speed to produce the desired result. For instance, sanding tasks are often completed more quickly than cutting or shaping tasks. The pulleys might be changed numerous times on a normal wood lathe job.
Let’s see Making A-Pulley On Lathe – Double Pulley Turning For V-Belts in the ᴀᴡᴇsome video below.
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Video resource: Vilson Alba
