using snatch blocks to move heavy things

USING SNATCH BLOCKS TO MOVE HEAVY THINGS FULL

Over time, it can wear down, especially if they are used with wire rope products – which cause additional abrasions. It is also very important to keep tabs on the groove’s wear and tear. These different styles are made to accommodate different types of ropes or cables, and it is best to choose a groove size that is 5% to 10% wider than the diameter of the rope used. There are also different shapes and styles of the grooves within the sheaves. It can be used for continuous operations on axial and radial loads. Tapered Roller Bearing: Heavier loads and high speeds.

USING SNATCH BLOCKS TO MOVE HEAVY THINGS FULL

Full Complement Cylindrical Bearing: High speed, heavy loads, and continuous operations.Roller Bearing: Suitable for heavier loads and high speeds.Bronze Bearing: Best for moderate weight loads with slow line speed.There are several different types of bearings that are used for different applications. Types of BearingsĪ bearing is an axle inside of the pulley which helps to minimize friction as the cable or rope moves back and forth within the sheave block. So, here’s everything you need to know about picking out the right shift block for whatever job that you have at hand. There are lots of types and styles – and some are better for specific jobs than others. Now, if you are in the market for lifting gear supplies, you may be a bit overwhelmed with the options available. This provides better support while allowing the cable to move smoothly over the top. It is also best to buy a sheave with rounded outside diameters as any sharp corners could damage or wear down the rope as it slides over the pulley.įinally, look for a sheave that has a thicker base and thinner side grooves. You also want to look out for a sheave with a smooth radius to reduce friction between the pulley metal and the cable or rope. You certainly want to purchase a sheave block that is durable and strong enough for whatever task you will be using it on. The opening between the interior sheave and exterior shelf is called the swallow, and the bottom opening of the shell is the breech. There is a pin that runs through the sheave so that it can rotate. Inside is the sheave or pulley, which looks like a wheel. There is also a protective shell surrounding the sheave. Next, there is a strap that surrounds the sheave block so the rope or cable stays in place. The most common design for a sheave block that is used in lifting equipment is comprised of seven parts:įirst, there is a hook at the top which connects the entire block to the lifting equipment piece, such as the top of a crane. Some models also add carbon and silicon for extra durability. These days, they are typically made with an alloy mix of iron and steel. Over the centuries, the overall design of sheave blocks has really not changed too much. Rope pulleys were actually used as far back as the 1500s in order to hoist water out of wells, and they were likely used to lift and move heavy rocks that created Stonehenge in the UK. Sheaves are also commonly known as pulleys, and when two or more pulleys are used together for extra strength, this is known as a sheave block. The cable smoothly moves over the wheel of the sheave as it is wound up on the fixed object, lifting the other object into the air. One end of the cable is attached to an item that needs to be moved, while the other is attached to a fixed object, like the base of a crane. They are used in tandem with a rope, belt, or cable to lift items with a crane.Įssentially, a sheave is a wheel with an open groove that a rope or cable fits around so it can rotate around the exterior. While sheaves may be a relatively small piece of hardware, they play a crucial part in mechanical engineering and lifting equipment.

Using snatch blocks to move heavy things