When your machines are down, you won't be able to continue operations until you replace your custom machine spindles. However, you'll need to make sure that the spindles you receive are custom-designed for the needs of your business. There are several types of machine spindles on the market. Source of Power A spindle always needs to be powered in some way. There are several types of custom machine spindles. These include belt-driven spindles, direct-drive, and motorized spindles.