1. Engineering Design I mvrt

2. 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

3. Design Constraints

4. Constraints As an engineering there are many constraints to worry about

5. Design Constraints Functionality Machine-able Feasibility Affordable – Time, man power, cost Size and Weight Maintainability Cost Effective Replaceable Programmable Practical

6. 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

7. 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

8. 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

9. Size The robot can only be 28” x 38” x 60” Need to fit… –Electrical components –Different manipulators Ex. Minibot release and arm

10. Weight The robot has a maximum weight –Ex. maximum 120 lbs. Includes arm, minibot release, electronics Does not include the battery or bumpers

11. 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

12. 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

13. Design Process

15. Brainstorming Understand the challenge Come up with ideas Evaluate the ideas by considering the constraints and using Common Knowledge

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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