156B Week 2

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

• In Process of finalizing specific parts of final design

• More analysis needs to be done on components

• Underwent analysis of tube slope and deflection under ideal loads by hand calculations

• Still in design and analysis phase for proving feasibility in current design

Accomplishments from Previous Week

• Created design for support structure and made CAD of support structure. -Brandon

• Found parts for support structure on Mcmasters -Brandon 

  • Designed the support rollers on Solid Works - Sergio

  • Conducted stress analysis on the support roller’s frame - Sergio Jorge

  • Created a parts list for the support rollers - Sergio

• Conducted a hertz analysis to determine the maximum stress at contacts - Sergio

• Designed load frame -Jorge

  • Created load frame parts list- Jorge

• Analyzed load frame in Solidworks to select build materials -Jorge

• Designed and selected parts from McMasters for axial constraints - Jerry

• Drew rough sketch of pulley driven design (below) - Jerry

• Designed a driving belt pulley for motor output shaft for a flat belt- Jerry

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

• • Determine axial deflection via hand calculations or FEMAP -  Sergio and Jorge

  • Order parts for the support frame if design is finalized during the CDR - Sergio

• If Parts arrive, start to manufacture support frame - Sergio

• Test support rollers in fatigue testing lab - Sergio and Jorge

• Aid in testing support rollers with a mock tube and weight - Jerry and Brandon

• Find means to axially constrain the load frame - Jerry

• Determine type of belt to use to rotate article - Jerry and Brandon

• Determine tension needed in belt and design a motor mount as belt tensioner - Jerry

• Based on belt type, design means to make sure belt is secure and will turn tube - Jerry

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

• • Spherical bearing option will be too expensive - Greg, by Email, 

    • Actions: went back to roller bearing design and minimized Hertz stresses with polyurethane wheels

• Completed CAD drawings of all the details - Greg, by Email, 4/5

  • Actions: Completed rough sketch of the new belt drive design

• Moved CDR from Monday, 4/9 to Thursday, 4/12 - Greg, by Email, 4/5

  • Actions: Asked CDR to be moved to a later date if possible since deadline seems very difficult to meet this week

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

Jerry, Isiah, Yoshio:

• • Roller design may be more economical

    • Actions: Reinforced idea of not using spherical bearings/ Eliminated idea of using spherical bearings

• Update week 1 progress report

  • Actions: Risks and goals for next week in this report carry from last week's report

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

Risks and Areas of Concern

• Loading of polyurethane wheels

• Still working on figuring out the axial stresses of the pipe under load

• Belt drive feasibility

• Dead weight feasibility

• Support Table strength when under concentrated loads in certain areas

• Design is still over budget

Resources or Information Required but not Available

• Polyurethane wheel performance under load

Schedule

• • Describe upcoming milestone

  • Critical Design Review, 4/12

  • Update Gantt chart (below), 4/9

Budget (list amount spent and amount remaining)

• No parts bought yet

Progress on Report and Webpage

• • Report: Have not started

  • Webpage: Last update was 4/7/2012 on task page (not visible on navigation links on the left)