Full Content is available to subscribers

Subscribe/Learn More  >

Analysis and Design for Two-Handed Heavy Part Assembly Methods

[+] Author Affiliations
Yodyot Wongwanich, Robert H. Sturges, Jr.

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. IMECE2002-39415, pp. 651-655; 5 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Design Engineering
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Design Engineering Division
  • ISBN: 0-7918-3628-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


In spite of advances in industrial automation, manual assembly tasks continue to be an important feature of many industrial operations. In heavy part assembly, some pieces of raw material or equipment are too heavy to be safely handled by just one operator. Material handling devices such as Jib cranes or overhead cranes are employed to help operators work safer and, in some cases, faster. However, during full-load productions, access to these devices could become limited due to insufficient resources and hence, delay or extend the cycle times. The authors studied how people perform the assembly and subsequently applied Fitts’ Index of Difficulty to develop a model which indicates factors that increase the task difficulty. This model can also be used as an assembly time predictor. Since improving the efficiency of an overhead crane could significantly reduce the total cycle times and production costs, the authors modified the crane by adding a spring between the hook and the gripper to help support the weight. Two sets of experiments were conducted. The first set was to investigate the effect of spring stiffness on assembly time. The result indicated that using a spring that was too soft could create a parasitic oscillation, which increases the assembly time. The objective of the second set was to compare the assembly time of using the regular crane to that of the modified crane in situations where the part weights and the task difficulty vary. As a result of the modifications, assembly performance tended to increase by approximately 250% from using the modified crane.

Copyright © 2002 by ASME
Topics: Manufacturing , Design



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In