María del Mar Aguirre Font

Efraín Hernández Rivera

Leslie M. Mercado Santiago

Elba M. Sánchez Santiago

Computer Aided Engineering Design Course

Dr. Vijay K. Goyal

December 1st, 2007

Disk-o-Poli Saw: Bringing the 1813 Disk Saw Into the 21st Century

Agenda

• BackgroundBackground• Literature SurveyLiterature Survey• Problem DescriptionProblem Description• Project FlowProject Flow• AnalysisAnalysis• Final DesignFinal Design• RecommendationsRecommendations• ConclusionsConclusions

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Background

• Disk Saws– One of the most useful home improvement tools.– Invented in 1813 by Tabitah Babhit.

• Project Focus– Bringing to the consumer the opportunity to have a multifunctional disk saw.

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Fig.1 Example of wood works

Fig.2 Wood Closet

Literature SurveyExisting Disk Saws and Sanding Machines

PROS:PROS:– Versatile applications including cabinets, doors and many other wood projects.– It can be adjusted for depth of cut, which minimizes kickback.– It can be adjusted to tilt up to 50 degrees in relation to the blade.

CONS:CONS:– It is not possible to cut the wood at angles bigger than 50 degrees.– Many workers have to make a big effort when carrying out these tools to the work place.-- Workers can not finish the entire work quickly.

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Fig.3 Ergonomic problem when using disk saws

Problem Description• To modify the existent disk saws, providing a second

application.

• The second application selected was a sanding attachment.

• This was achieved through the Design & Analysis of a disk saw and a sanding machine components individually and uniting them will allow to the consumers:

• Fast switching to the sanding attachment.• Reduce- # of steps & time due to the multifunction.• Reduce human effort required.

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Project Flow

Generate Ideas

Need

Final Design

Analysis

ConclusionsFinal Remarks and Recommendations

+ =

3

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Optimization Analysis

• Method: Lagrange's Optimization Method

• Focus: To optimize the total volume of the shaft and gear.

• Analysis of stresses to which the shafts are submitted to.

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Fig. 4 Shaft to be optimized

Optimization Analysis (Ctd.)Design Variables

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L

D

F

dgear

b

Fig.5 Sketch showing design variables

Optimization Analysis (Ctd.)Objective Function

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Optimization Analysis (Ctd.)Constraints

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EqualityInequality

Optimization Analysis (Ctd.)Results

•The dimension obtained from the optimization analysis comply with K-T conditions

•Analysis gives us the following results:

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*f(x)=1.77in3

Structural AnalysisANSYS

12Dr. Vijay K. Goyal INME 4058 Fig.6 Meshed Product

Fig.7 Applied Forces (in red)

Structural Analysis (Ctd.)Stress and Strain Plots

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Structural Analysis (Ctd.)Deformation Plot

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Fig.8 Ansys plot showing deformation

Cost Analysis

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**Miscellaneous: screws, bolts, nuts, etc.

Final Design

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After perform all the analyses the resulting design of the Disk-o-Poli Saw optimized part looks as shown:

Fig.9 Optimized part

Recommendations

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•Develop a more detailed analysis of:•Materials•Stresses•Thermal implications

•To make an ergonomic analysis of the handle.

•To design a universal adapter.

•Design the machine in such a way that it can be used to cut not only wood, but plastic and concrete.

Conclusions

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The Disk-o-Poli Saw will facilitate projects due to:

Minimize workers effort during their projects

Guarantee workers less time of work

Multifunction will lead to complete the wood work

Feasible in terms of cost

Acknowledgements

•God

•Professor Vijay K. Goyal

•Professor Ricky Valentín

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Questions

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Thank You!

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