In the world of overhead material handling, there is lifting, and there is precise lifting. When a high degree of accuracy is required to make a pick or place a load, the application calls for a hoist with “true vertical lift” capability.
True Vertical Lift is when a hoist can lift the hook straight up and down with no hook drift to pick up or put down in an exact spot. In general, single-reeved wire rope hoists operate with a certain amount of natural drift, and for many applications, that’s not a problem. However, when the load must be lifted or lowered to a specific spot, the industry provides double-reeved wire rope hoists.
These units operate with wire rope that’s fed through a series of sheaves in the hook block and hook frame. They’re also wound on two separate sides of the wire rope drum called left-handed and right-handed grooving. The standard reeving on cataloged hoists with true vertical lift is “two part double” which has four separate parts of wire rope. Also common is “four part double” reeving made from eight separate parts of wire rope. More wire ropes create a mechanical advantage, allowing for the handling of heavier loads at a slower speed.
Have an application for precision lifting? Contact us! We’ll assist you to find the hoist equipment that best meets your needs and budget.
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