engineering design i mvrt. table of contents design constraints constraints design constraints...
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EngineeringDesign I
mvrt
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Table of Contents
Design Constraints• Constraints• Design constraints
– Functionality– Machine-able– Feasibility – Time– Size– Weight– Maintainability
• Big picture
Design Process• Brainstorming• Narrowing the design• Prototyping• Redesigning• Finalizing the design• Inventorizing• Machining• Building/Assembly
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Design Constraints
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Constraints
As an engineering there are many constraints to worry about
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Design Constraints
• Functionality• Machine-able• Feasibility • Affordable – Time, man power, cost• Size and Weight• Maintainability• Cost Effective• Replaceable• Programmable• Practical
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Functionality
• What are you trying to accomplish? • Functionality - The function you want the
part to serve– Maximize how well the part works– Simple is always better
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Machine-ability
• How easy it is to machine the part– We have limited resources and machine most
of the parts ourselves
• Timing and feasibility are key– Timing – limited time can be spent machining– Feasibility – Our machines can only do so much
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Cost
• We have a limited amount of funds allotted from our budget to spend on the robot
• You are only allowed to spend a fixed amount on the final robot
• Specialty parts and shipping costs add up
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Size
• The robot can only be 28” x 38” x 60”• Need to fit…
– Electrical components– Different manipulators
• Ex. Minibot release and arm
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Weight
• The robot has a maximum weight– Ex. maximum 120 lbs.
• Includes arm, minibot release, electronics• Does not include the battery or bumpers
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Maintainability
• After building, you need to maintain all the parts– Ex. If you have surgical tubing, it needs to be
changed often– Ex. Tightening bolts, wires
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Big Picture
• Needs to fit constraints present by FIRST– Ex. Size and weight
• Follows the spirit of FIRST• Able to be integrated with the design of
the rest of the robot• KISS – Keep It Simple Stupid
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Design Process
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Design Process
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Brainstorming
• Understand the challenge • Come up with ideas• Evaluate the ideas by considering the
constraints and using Common Knowledge
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Narrowing the Design
• figure out details of the design on paper and later inventor– More details on paper = easier to put into
inventor
• Come up with plan for prototype• Figure out how parts connect together• Choose materials and other specifics of
the design • Re-evaluate design with considering the
other components of the robot
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Prototyping
• Build a prototype of the design• Use cardboard and other easy to find
material• Purpose: Proof of concept
– Starts addressing issues that will come up in the real part
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Design Review
• Get advice from experts in the field– Ex. mentors
• Welcome constructive criticism– Helps solve design flaws– Introduces new ideas
• 1-2 every build season
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Redesign
• Use feedback from Design Review• Enhance design
– Fix flaws by either fixing the prototype or creating a new prototype
• Come up with a better big picture of the design
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Finalizing the Design
• Finalize the design• Figure out how the different components will
connect• Finalize the material
– Ex. bosch vs. Aluminum
• Connect with the rest of the robot– Make sure you are doing this throughout the whole
process because many of your constraints are due to other components of the robot
• Address all the constraints – cost effect, weight, and functionality
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Inventor
• Put the final design on Inventor– Should be creating inventor drawings
throughout but want to make sure to have a final drawing
• Purpose: Helps with putting together the design of the entire robot – Helps address problems in specific part of the
component of the robot– Helps with Machining– Another Visual of Robot
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Machining
• Designs are sent to woodshop to be made• Remember, setting up for the process is
hardest– Don’t make the machinist re-make a part later
because you created the part wrong the first time
• Accuracy is the most important thing to remember– Think about what the part is using and how if this
one part is messed up how it will affect everything else
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Building/Assembly
• Putting all the parts together• Make sure the parts are secure
– See where parts are weak that you didn’t expect
• Maintenance is important here:– Screws and Bolts do come loose as the robot
moves