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ROTOTILT

INTRODUCTION. The current project proposes to build a device that will secure and orient a model (Dental impression mold) for a process which creates a 3-D digital image by means of a laser lithography camera. Multiple scans are the norm in the laser lithography process, the design will be used for repositioning the dental mold for successive scans. The design needs to have a sequence of angular increments to add repeatability and control to the model positioning process. .

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ROTOTILT

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    1. ROTOTILT Robert Ress Bryce Young Osinanna Okonkwo

    2. INTRODUCTION The current project proposes to build a device that will secure and orient a model (Dental impression mold) for a process which creates a 3-D digital image by means of a laser lithography camera. Multiple scans are the norm in the laser lithography process, the design will be used for repositioning the dental mold for successive scans. The design needs to have a sequence of angular increments to add repeatability and control to the model positioning process.

    3. PROBLEM APRAISAL PHASE

    4. CUSTOMER The unit will be used by the graduate students of the mechanical engineering department engaged in research in conjunction with the Indiana University School of Dentistry. Other customers for this design project include: The Sponsor The End User (Graduate M.E. Students)

    5. CUSTOMER REQUIREMENTS Response to a questionnaire provided a solid groundwork of desired features, operating conditions, and design constraints. Important operation conditions included the ability to operate under a one-pound payload and to have safe operation in laboratory conditions. Portability (Small size) Stability Multiple Degrees of freedom Smooth translation Controllable/measurable translation Lightweight Safe Easy to operate Easy to assemble Easy to maintain Affordable (low cost) Minimize or eliminate Noise Environment friendly

    6. PROJECT BOUNDARIES For the project’s boundaries we identified the following: Incorporation of the rotary table should simplify and offer more control over the orientation process. The design should be a functional unit, which satisfies all customer requirements and accommodates for the existing laser. The last major design boundary was the budget limit of five hundred dollars.

    7. PROJECT OBJECTIVES The objectives of the design project are to create a unit that can perform the functions described earlier by: Create a CAD model of device Create a 2D drawings to enable manufacturing Create a prototype

    8. DESIGN REQUIREMENTS

    9. ENGINEERING REQUIREMENTS Overall Weight Displacement Tolerance Factor of Safety Number of Materials Revolution Rate Cost Overall size Number of Controls Number of tools Strength

    10. ENGINEERING TARGETS

    11. COMPETITIVE BENCHMARKS

    12. HOUSE OF QUALITY

    13. ENVIRONMENTAL ISSUES Our product will be constructed from recyclable materials (metal & plastic) The mechanical design does not require power, and does not contribute to pollution Not a mass produced product Conversely, corrosive effects from the environment do not significantly affect the product (indoor use)

    14. CONCEPTUAL DESIGN PHASE

    15. FUNCTIONAL DECOMPOSITION Overall Function: Orientate and scan model

    16. OVERALL CONCEPTS Concept 1 Mechanically operated system Utilize existing rotary table design Worm gear driven rotary table 6 Total DOF Concept 2 Electrically operated system Worm gear driven rotary table 4 Total DOF Concept 3 Mechanically operated system Spur gear driven rotary table 4 Total DOF Concept 4 Mechanically operated system Utilize existing rotary table design 2 Total DOF (Excluding the camera)

    17. SKETCHES – Concept 1

    18. SKETCHES: THE CHOSEN CONCEPT 4

    19. CONCEPT EVALUATION IDENTIFICATION OF FAILURE MODES Failure modes were assessed by the group during this procedure. They included: Table rotation gear damage Table tilt angle failure Clamping system failure Electrical motor failure The group determined that all concepts would be able to meet the requirements at this phase.

    20. PRODUCT DESIGN PHASE

    21. PRODUCT DESIGN Based on our concept parts were modeled using Pro-Engineering

    22. MATERIAL(S) SELECTION Aluminum was chosen as the material for all the pieces that were to be machined for various reasons, namely: Light weight – the density is only 0.0975 lb/in3 High strength Good workability Resistant to corrosion Widely used in aircraft fittings, marine’s fittings, brake pistons, and hydraulic pistons.

    23. PRODUCT EVALUATION PHASE

    24. F.E.A

    25. SUMMARY OF F.E.A RESULTS FEA Analyses were carried out using PRO-E Mechanica

    26. PRODUCT EVALUATION COMPARISON TO ENGINEERING REQUIREMENTS There are 10 engineering targets to be attained. The table below illustrates the targets and shows whether or not the design met the target.

    27. CLOSING

    28. DEMONSTRATION

    29. ANY QUESTIONS?

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