Sixth-Graders Leverage Human-Powered Crane to Increase Work Efficiency
Moving bales of hay from the hay mow to the winter steer pen at the Manhattan Country School Farm can be an arduous, but fun task for students. This week, as part of farming class, MCS sixth-grade students worked together to move wagon-loads of 15 to 20 hay bales. Each bale weighs approximately 35 pounds; the beef cattle will consume 6 to 8 bales per day. This student-led task is necessary several times per week.
One hurdle that we’ve always struggled with is moving bales when the hay level drops in the barn. When the bales can no longer be hoisted onto the wagon, students must haul them, one at a time, through the downstairs stable area. This not only makes more work, it is an inefficient way of completing the task. To solve this dilemma, Garth, one of the MCS farming teachers, created what is essentially a human-powered crane. Using a hand-cranked winch, students can lift several bales at a time from the mow up to the wagon. A cable, which is threaded through a pulley system, is connected to a platform, which is actually a repurposed ping pong table flipped upside down. While some students are down in the mow loading bales, others power the winch. Once the wagon is loaded, the hay is transported by tractor to the steer pen and stacked. Through this exercise, the sixth-graders made connections back to their study of simple machines when they were younger. By employing a lever and pulleys, wheel, and axle to offset a load with force, those earlier lessons become a practical way of completing a job.