Week 5

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

• Further and more complete strain gauge analysis and design has been done

• Old hard drive tester has been moved to EBU II for easier access complete with both power sources

• Completed fabrication of temporary clamping mechanism for beams

• Bending beam tests on hard drive tester being set up

Accomplishments from Previous Week

• Obtained free samples of small full bridge strain gauges (Vishay,  (Bryan)

• Completed machining of bending beam clamping device (Daniel C. Paulo Daniel W.)

• Moved hard drive tester from CMRR to EBU II basement (Daniel W., Daniel C. , Paulo)

• Preliminary tests of Teflon sample on dish with no ice (All)

• Researched Damping Tapes from 3M  (Bryan , Paulo)

• CAD drawing of hard drive tester with tapped holes (Bryan)

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

• Obtain strain gauges and apply to a beam (Bryan)

• Acquire DAC and fully understand circuit for strain gauges (Bryan  Daniel C.)

• Finalized beam design (Daniel W.)

• Tests with actual sample on dish with ice (Daniel C. Daniel W.)

• Test smooth ice creation methods  in the dish (Paulo)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

Worried about the vibrations of the motor from the finalized design on the beam look into damping tape to suppress vibrations

• We have looked at some of the various types of 3M tape and there are several types Description: 3M Vibration Damping Tape 434, 1 in x 60 yd, Price : $79.83 Per Roll

Wants us to make more tests for flattening and leveling ice and create a small mechanism to level it

• We have been running a few tests with an iron and we are designing some small device to keep ice level in freezer

Put beam perpendicular to the sample for easiest calculation

• Designed a clamping device to sit perpendicular to rotation of dish

Sponsor wants an error analysis (Monte Carlo) of beam vs. length

• Need to run some new tests to determine this at different lengths

Have test set up by next week and use different damping materials if possible

• We should have the test apparatus working by Wednesday afternoon we still need to obtain some damping materials

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

How to get table to temperature? Will it work

• Spoke to Ray the Lab technician in CMRR about getting one of the other old testers to use in a freezer of some sort

Present budget to Professor Talke and Jin

• Accepted it but still want approval before large purchases impressed that we have gotten most for so cheap or free

Get pictures of all experiments

• We have for all experiments since Wednesday and need to rerun one from last week

Add click to link on our webpage

• We will update it this afternoon.

Get a test down with material and actual beam and see if there are major vibrations. With a video

• We have done a very basic one without ice and there are indeed some vibrations but we intend to find a damping material to hopefully fix this somewhat.  Still need to film.

Take a photo of drops on each material

• Photos have been taken but not uploaded

Risks and Areas of Concern                       

• Selecting a strain gauge and beam combination to get the most accurate reading for friction

• Possible vibrations with the thin shim stock beam

• Ice not being very smooth

Resources or Information Required but not Available

• We would like to use a large freezer to test the hard drive tester which was provided. We have no knowledge about the tester because it is so old and would like to see its performance at low temperatures

Schedule

• Obtain and attach strain gauges by next Thursday 2/16 (Bryan, Daniel W.)

• Complete smooth ice creation methods and leveling 2/10 (Paulo)

• Run beam tests with various damping materials (Daniel C. Paulo)

• Finalized beam type and size Wednesday 2/15

• Brainstorm modification idea of the Hard Drive Tester (All)

• Implement individual test data into report form (All)

Budget (list amount spent and amount remaining)

• $20 – Shim stock

• Now have a $500 budget but still need to run purchases by Professor Talke

Progress on Report and Webpage

• Webpage has all individual component reports

• Webpage has weekly progress reports

• CAD drawing on front page   

• Add actual pictures and more updated info by Friday (Paulo Daniel C.)

• Report – keeping data and pictures of our preliminary tests for use in the report first draft finished by Friday (Bryan and Daniel W.)