156B Week 9

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Analysis status:

    • threads - found thread size for UNC/UNF standards

    • FEA - analysis on Z-boss and sliders done

  • Fabrication:

    • full-scale slider is complete...NEED to make more w/ better manufacturing method

    • Finish 4 bosses

  • Problem with blackout on Saturday - we weren't able to access the machine shop all weekend to fabricate new parts, weld aluminum drip pan

Accomplishments from Previous Week

• • Made changes to design of ball mount, now known as heli mount

  • Finished the 2nd draft of our report, made changes to our website

  • Full-scale slider complete

  • Bosses are almost complete..waiting on threads

  • CAD for 3D prototype is complete..need to cut out

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • FEA analysis on 2 main concepts

    • Heli mount - Cary                                 5/30

    • Review Z-boss slider analysis with Solar 5/29

  • Cut out the base to new scale for 3D printed Hemi Mount 5/30 (after meeting with Solar)

  • Finish Bosses 5/30

  • Make new Sliders 5/31, 6/1, 6/2 (if necessary) Luis

  • Provide new .STL file to Chris for print   5/31 at latest Hien

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Kimberly: two main concepts to focus on: hemi mount and Z-Boss sliders. 

    • Do FEA analysis for those concepts, build prototype, drawings, assembly instructions (ordered from most to least important)

    • Build Z boss and slider prototype-decided that it will all be machined...there will use metal drip pan representation.

    • ---------

    • Solar does not want to drill into mount pad on Hemi mount to bolt down component

      • Spend time on hemi mount to make adjustment possible with rotating slot

      • Hemi mount will be made in 3D printer...closer to actual scale. 

      • Perform FEA on ball mount...if having difficult, we can make a .STP file and send to Solar

    • Other prototypes are secondary: Cone, Slider Plates (provide models and drawings)....prototype if time allows

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

During Presentation:

• • Quantify the problem...how much misalignment?

    • There is no exact number on misalignment. Misalignment can be from .1 inch to .5 as shown in rework instructions

  • No mention of corrosion problem

    • Corrosion problem has been addressed. Solar treats threads to be anti-corrosive. Also, Kimberly classified fluid worries to be related to condensation

  • Is .7 inch adjustment enough? 

    • .7 inch is enough for cases that we have seen...if a boss is welded in and off by 1 inch (unlikely) then this boss wouldn't fix. Although we can make the boss provide an inch, we are limited by clearance. 

  • Don't you need bolt holes for top plate?

    • Bolts will be added to component that is mounted

  • Not Clear how slot on ball mount works

    • Slot is much more defined in new design that is ready for 3D printing

    • Previous slot was going to be made by drilling into mount pad with component set into place

  • This is the first discussion I have seen of angular misalignment. How big of an issue is this?

    • This is back to the problem of having the component mount level and not mount at the angle of the drip pan. 

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • It would be good to quantify pros/cons---Including that in report (this has been done for concepts)

  • Fabricating a finished product out of steel is not a concern for your project? -- steel is harder to work with. Prototype we make will not actually be used so no purpose in making out of steel. 

Risks and Areas of Concern

• • FEA analysis on ball mount

  • Weld issue: Looking at Shigley's and getting input from Analysis group at Solar

Resources or Information Required but not Available

• • Standard Handbook of Machine Design not available on Knovel - "The book you have requested is currently unavailable"

Schedule

• • Please refer to Goals for next week

  • Update Gantt chart.

  • Grade report for Team 2 by Thursday

  • Presenting at Solar Turbines on June 7th at 11:00 am

Budget (list amount spent and amount remaining)

• • Amount spent: $421

  • Amount remaining: $329

Progress on Report and Webpage

• • 2nd draft complete. The appendix of report is being worked on so that it includes every work we've done in the past