1. University of Puerto Rico Mechanical Engineering Department Ha-S Hide-Away Shank Screwdriver Lynnette M. Méndez-Galarza Jean Carlos Rivera Mario Rosario Adorno Reinaldo Santiago Bermúdez Vijay K. Goyal, PhD -- Faculty Advisor Course: Computer Aided Design

2. Agenda Problem Description Objectives Possible Solutions Idea Selection Design Specifications Optimization Analysis Cost Analysis Conclusion

3. Problem description Adult accidents: Dropping the tool Misplace the tool Children’s curiosity: Poking body parts Playing with power outlets Compact: Difficult Portability Awkward Storage Picture: http://clerccenter.gallaudet.edu/AcademicTeams/EC-ed/2001-2002/electric/images/Screwdriver%20EN.jpghttp://clerccenter.gallaudet.edu/AcademicTeams/EC-ed/2001-2002/electric/images/Screwdriver%20EN.jpg

4. Objectives Minimize risk of an accident with a screwdriver. Child-proof Compact the screwdriver for easy storage and portability

5. Possible Solutions First idea - Hide-Away Gear Shank

6. Possible Solutions Second idea - Hide-Away Antenna Type Shank

7. Possible Solutions Third idea - Hide-Away Shank

8. Idea Selection Criteria Score (0-10) Datum Score Idea I Score Idea II Score Idea III Score Weight20-2 Size40222 Safety100112 Versatility70222 Appearance30122 Additional Features30112 Production Cost30-2 TOTAL320447 Total PositiveN/A07810 Total NegativeN/A0-3-4-3 Weighted Total N/A0303146 *Datum-Regular Screwdriver

9. Selected Design Specifications BITBOX

10. Selected Design Specifications

12. Optimization Analysis Minimize weight Everything with a subscript “1” refers to the shank properties Everything with a subscript “2” refers to the handle properties

13. Optimization Analysis Method of Lagrange Multipliers Constraints: LaGrange Equation:

14. Optimization Analysis

15. Solution:K-T Conditions

16. ANSYS Analysis Preprocessor Real Constants Material Properties Modeling Meshing Solution

17. ANSYS Analysis

20. Cost Analysis Part / processPrice Polymer 8’$65.04 Stainless Steel Rod (303) - 6’-5/32”R$7.48 Stainless Steel Tube (304) - 12”-5/16”R$4.59 Bits (16pzs)$3.00 Bitbox$5.00 Miscellaneous$5.00 Turning @ $30/hr$0.50 Total of one design$90.61

21. Cost Analysis Part / processPrice Polymer – 3”$2.00 Stainless Steel Rod (303) - 6’-5/32”R$0.30 Stainless Steel Tube (304) - 12”-5/16”R$0.80 Bits (16pzs)$3.00 Bitbox$5.00 Miscellaneous$5.00 Turning @ $30/hr$0.50 Total per screwdriver$16.60

22. Conclusions Optimum value 3” long 0.15” radius Stresses do not exceed safe limits Easy storage Child-proof

23. Peace of mind now comes in a small, practical and attractive package: the Ha-S.

24. (KISS) Questions or Comments