How Do You Build A Block And Tackle Pulley?
If you need to lift a heavy load, a block-and-tackle pulley system might make your job easier. A block-and-tackle hoist can magnify the force you input into the pulling rope, so that less force is needed to lift the same weight. This magnification of input force is called “mechanical advantage.” A simple pulley system is not difficult to construct, using items that are easily purchased at mountaineering shops or over the Internet. Purchase two double-pulley blocks. Links for online purchase are provided in the Resources section below. Attach one of the pulley blocks to the load to be lifted. The block will have two eyelets, one on each side. Attach the pulley to the load through one of these eyelets. Attach an eyelet of the other pulley block to a support above the load. Thread end one of the line or rope (tackle) through one of the two wheels of the hanging double-wheel block. Specifically, fit the line into the groove of the pulley wheel so that the line is making contact only with t
