What is an overhaul ball?

What is an overhaul ball?

Heavy steel ball used to provide ballast on the hook end of a crane hoist rope. Overhaul balls supply the downhaul weight necessary to counter bearing friction and winch-to-boom-tip line weight. It can also be used in lieu of a winch.

Why is it called a headache ball on crane?

To combat the phenomenon, crane hooks for single-part load lines are assembled with these weighted balls. The official term for the assembly is an overhaul hook ball, but enough ironworkers and other tradesmen have had unpleasant encounters that the assembly has earned another name — a headache ball.

What is the ball on a crane called?

Headache Balls, also known as overhaul hook balls, are very important devices used in a single line hoist wire rope with the purpose to add weight and help the line to drop down after coming up the crane boom and going over the sheave.

How much does crane headache ball weigh?

Split Balls

What is Reeving on a crane?

A rope reeving is a mechanical device with several pulleys commonly used on lifting equipment. It allows to lift heavy loads while limiting the force applied on the hoisting ropes. There are many different types of rope reeving.

What is a jib boom on a crane?

It is a crane with a horizontal member, commonly known as the jib or boom. A jib is an operating arm that extends horizontally from the crane. The role of the jib is to support a movable hoist fixed to either a wall or pillar mounted on the floor. It is mostly used in industrial premises.

What is unbalanced Reeving?

Whenever the main hoist line is reeved to one side of the boom tip, this results in unbalanced rope reeving. This causes the boom to twist, and this subsequently reduces the rated capacity of the crane.

What does dog mean in rigging?

Magnet is Disconnected! Dog Everything: Clasp hands in front of the body. Means PAUSE. This signal can be used on potentially risky occasions such as when it has started raining, when the load doesn’t fit the space for which it was planned, or when a bystander gets too close to the action.

What does IPS stand for in rigging?

This new grade was aptly named, “Improved Plough Steel” or I.P.S. for short. Improved plough steel became the de facto steel to be used until it was once again improved upon, to the point where it is actually difficult to find Plough Steel grade wire rope in inventory at a sling shop.

What is Reeving in cranes?

Reeving (rope): The reeving of the hoist is the path of the rope between the hoist and the load block. Double reeving is two parts of wire rope leading off of the drum, one from each end of the drum, creating a hook movement referred to as True Vertical Lift.

What is sheave in crane?

What is the Sheave? The sheave is a grooved wheel that is used for guiding and holding wire rope. The sheave rotates on a bearing which allows the wire rope to move freely ,minimizing the friction and wear on the rope as well as providing a smooth crane operation.

What is RCI in crane?

Rated Capacity Indicator – RCI On a Rated Capacity Indicator, the load weight value is calculated by reading the strain on the wire rope. This is done by using a load pin in a sheave, a running line tensiometer (linerider) or a dead-end load cell installed at the becket end.

What is SWL of crane?

Safe Working Load (SWL) of any mobile crane depends on the operator’s skill, condition of the ground, boom length, the radius of rotation while lifting the load, the inclination of the boom to the vertical and outrigger blocked or free. Safe Working Load is generally tabulated in the load chart of the crane.

What is the weight of a swivel overhaul ball?

The top swivel overhaul balls are designed to remain stationary if the wireline spins. These are available in 4 and 7-ton capacities, as well as 85, 150, and 200 lb. weights. We even offer two different hooks that have deformation and angle indicators.

What is a split overhaul ball?

Each split overhaul ball is specially designed for tasks where headroom is important. The angular contact bearings on the overhaul ball ensure the most efficiency and longevity of the swivel and Wireline. Plated in zinc, these overhaul balls will resist corrosion.

What are overhaul balls used for on a crane?

Overhaul Balls Overhaul balls are used to add weight to a crane rope so that the crane lines are kept taught. This prevents spooling and twisting issues that would ultimately create permanent damage the crane. These overhaul balls vary in size and design depending on the crane truck or shop environment in which it’s being used.