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TM 115 Forces in a crane jib



  • Vectoral handling of forces in a planar central force system


Technical Description
TM 115 represents 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.

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


[1] tensile and compressive forces in a planar central force system based on the example of a crane jib
[2] various jib forms possible
[3] integrated spring balances in the bars
[4] max. load on crane jib 50N
[5] loading up to 50N
[6] steel loads, surfaces galvanised
[7] stainless steel retaining bar
[8] sturdy metal frame
[9] handles to aid transportation
[10] storage system 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
   - 1x 1N (hanger)
   - 4x 1N
   - 1x 5N
   - 4x 10N

Dimensions and Weight
LxWxH: 600x200x670mm
Weight: approx. 15kg
LxWxH: 720x480x178mm (storage system)
Weight: approx. 10kg (storage system)

Scope of Delivery
1 experimental unit
2 spring balances
1 set of loads
1 storage system with foam inlay
1 set of instructional material

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