Mar

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

• Background
• Literature Survey
• Problem Description
• Project Flow
• Analysis
• Final Design
• Recommendations
• Conclusions

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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.

Fig.1 Example of wood works
Fig.2 Wood Closet
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Literature Survey

• Existing Disk Saws and Sanding Machines
• 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
• 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.

Fig.3 Ergonomic problem when using disk saws
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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
Need
Generate Ideas
Final Design
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Analysis
Final Remarks and Recommendations
Conclusions
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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.

Fig. 4 Shaft to be optimized
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Optimization Analysis (Ctd.)
Design Variables
Fig.5 Sketch showing design variables
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Optimization Analysis (Ctd.)
Objective Function
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Optimization Analysis (Ctd.)
Constraints
Equality
Inequality
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Optimization Analysis (Ctd.)
Results

• The dimension obtained from the optimization
  analysis comply with K-T conditions
• Analysis gives us the following results

f(x)1.77in3
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Structural Analysis
ANSYS
Fig.7 Applied Forces (in red)
Fig.6 Meshed Product
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Structural Analysis (Ctd.)
Stress and Strain Plots
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Structural Analysis (Ctd.)
Deformation Plot
Fig.8 Ansys plot showing deformation
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Cost Analysis
Miscellaneous screws, bolts, nuts, etc.
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Final Design
After perform all the analyses the resulting
design of the Disk-o-Poli Saw optimized part
looks as shown
Fig.9 Optimized part
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Recommendations

• 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.

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Conclusions

• 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

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Acknowledgements

• God
• Professor Vijay K. Goyal
• Professor Ricky Valentín

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• Questions

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• Thank You!

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