What is the primary purpose of an idler wheel in a band saw's pulley system?

The primary purpose of an idler wheel in a band saw's pulley system is to guide the blade. The idler wheel plays a crucial role in maintaining the correct alignment and path of the blade as it moves through the cutting process. By ensuring that the blade travels in a straight line, it helps achieve accurate cuts and prevents the blade from wandering or deviating from the intended cutting path.

The design of a band saw typically includes one or more idler wheels that adjust the tension and positioning of the blade. While ensuring proper guidance, these wheels do not provide the primary function of tensioning the blade or cutting through materials directly. Their main focus is on maintaining stability and direction during operation, which is vital for effective and precise cutting.