Jib Crane Apparatus

This unit is designed to study forces in jib crane elements. Jib crane has two elements which are attached to a vertical rod. The lower element is called jib and the upper element is termed as tie. Load is applied at the junction of jib and tie to produce tension and compression in tie and jib respectively.

The unit consists of a metallic rod which provides the support locations for jib and tie. Load is applied via a hanger on the junction of jib and tie. To measure the deformation in jib and tie, dial gauges are connected to both elements.

a planar central force system in which multiple forces act on a single point of application. Based on the example of a crane jib, forces are determined graphically and experimentally: resultant cable force, tensile force, compressive force. The directions and magnitudes of the forces are determined graphically by way of a force parallelogram.

A bar of adjustable length and a chain make up the crane jib, which is attached by adjustable clamp elements to a retaining bar. A variety of jib forms can be created. Loads are applied to the crane jib. The occurring bar forces are indicated by integrated spring balances.
Jib Crane Apparatus    
Learning Objectives / Experiments
Graphical breakdown of forces by force parallelogram
Determination of the bar forces on various jib forms
Comparison of: measurement result – calculation – graphical method

Specification
Tensile and compressive forces in a planar central force system based on the example of a crane jib
Various jib forms possible
Integrated spring balances in the bars
Max. load on crane jib 50N
Loading with weights set, up to 50N
Steel weights, surfaces galvanized
Stainless steel retaining bar
Sturdy metal frame
Handles to aid transportation
Box to house the components

Technical Data
Spring balance for tensile forces
tensile force: 0…50N, graduations 0.5N
Spring balance for compressive forces
pressure force: 0…50N, graduations 1N

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