Overview of Status of Analysis, Design, Fabrication, Tests, etc.
New dish design is being fabricated
Meeting with Mike Watkins today after the meeting for help with strain gauge attachment to beams
Damping tape samples have been requested
Bending beam tests on hard drive tester being set up
Accomplishments from Previous Week
Obtained amplifier, DAQ, and strain gauges (Bryan Daniel W.)
Writing a labview code for data acquisition of the strain gauges (Bryan Daniel W.)
Redesigned dish with the help of Mike and presentation feedback (Daniel C. Paulo)
Fabrication of new dish (Daniel C)
Researched damping tape from 3M, ordered a sample (Daniel W.)
CAD drawing of hard drive tester with bending beam clamp (Daniel W.)
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Test new dish which can prevent ice from slipping (Daniel C. Paulo)
Attach strain gauges to several beam sizes (Bryan Paulo)
Test the strain gauges bonded onto beams (Daniel W. Bryan )
Tests with actual sample on dish with ice (Paulo Daniel C.)
Apply 3M damping tape (Daniel W)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments
Purchase Damping Tape.
We have obtained samples of the damping tape and is being shipped.
Bond Strain Gauges on and get some data
We have been waiting for Mike Watson to return to bond on the strain gauges and have therefore not been able to get data yet, hopefully we can have them bonded by the end of today
Obtain LabVIEW
Downloaded the free student trial and are getting the VI for the bending beam MAE 170 lab
Instructor Comments from Last Meeting and Actions Taken to Address these Comments
Fix Optical Sensor
Tried obtaining one for free, haven’t found one yet will look in Professor Talke’s lab before purchasing one
Consider the effect of airflow on bending beam
The vibrational tape may help prevent this from being a problem
Protect cleanliness of sample methods to do this?
Spoke to Professor Jin and he said not to touch the samples with our hands but he is not sure if we can clean them with anything and must ask his Postdoc students
How do we get the strain gauge attached? talk to Vishay.
There are adhesives you can apply Vishay has several M Bond 200 is most commonly used. Mike Watson has the materials and is willing to bond them on for us.
Do beam bending and strain integrate with strain gauge spec sheet?
With a very thin beam it will create enough strain and possibly with the thicker beams if the friction is higher than we conservatively calculated. The gauge factor could ideally be a little larger but the preliminary tests should make this clear.
Any electrical noise out there you will also be amplifying?
The noise from the power outlets, the wires, hopefully the twisted, wires will decrease that. The strain gauge and amplifier should cut down some of the noise
Wants plots and video and signal to noise ratio?
Unfortunately since we haven’t been able to attach the strain gauges we have not been able to get actual data, but by the end of this week or sometime early next week we will have data.
Instructor comments for Proof of Concept
What was changed from preliminary beam test to the ones presented in class?
The preliminary test was done for different beam sizes and a few variation of weight. This test was done with one beam but variation weights
Consider using end mill for making groves in the new dish design
We have taken this comment and have implemented it to the new dish design
Can you raise disk speed gradually to prevent things from flying
The speed cannot be gradually increased
Pros and Cons of various types of strain gauges
Additional strain gauges we will look into once we have tested the ones provided by Vishay
Classmates Comments
Will thicker Ice help prevent breaking?
Yes, we think that having thicker ice will help make it sturdier; therefore, our new disk will have higher walls to allow for this.
How do you come by these really thin cantilever beams?
We, cut our beam from precision shim stock.
Could you place beams radially in dish to prevent the ice from spinning?
While this would probably work, it would make our ice thinner in some sections and be difficult to machine.
Can you use a micrometer to check the levelness of the ice?
It would be difficult to check every part of the ice with a micrometer simply due to the surface area of the micrometer compared to the ice; however, this method could help us get an overall sense of the contour of the ice and is likely to be tried.
Can you smooth the ice while its spinning?
While there is a small safety hazard in doing this it may help get smoother ice and will be attempted.
Will the beam deform over time making later test inaccurate?
All of our test should operate in the elastic range of the beam and cause no permanent deformation.
Can you put more teeth in the new dish to ensure it won’t slip?
Yes, the drawing shown in the presentation was just a rough idea. Our final design has several more teeth.
Can you create separate compartments for the ice so it won’t slip?
We need the ice to be a continuous piece for our test to run smoothly so this won’t work.
Will the ice in the tabs of your new design break?
While this is a possibility, we believe that with enough tabs the force will be distributed enough the prevent breaking. If this proves to be a problem, the corners of our tabs could be rounded to make the tabs stronger.
Could you create a lid to put over the ice to keep it from flying out?
We are more concerned about the ice cracking or chipping than it flying out. Having a lid would not solve this problem.
Could you put set screws in the side of the dish for the ice to freeze around?
We are looking at doing this to our existing dish to make the ice stop spinning
Will the hard drive tester eventually become off balance from running the test on one side only?
While this is a possibility, our tester has shown no signs of this so far. We are applying minimal force to the tester so it should be able to handle this load.
Rough Draft Comments
Abstract needs to have less background and more detail on what we did.
Reference figures and sources properly
Number equations
Put in picture with level for ice making procedure
Link figures to text
Put in actual references
Risks and Areas of Concern
Ice deforming after a matter of rotations
Sample causing ice to shatter as seen in previous experiments
The amount of noise may overwhelm the signal
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 the end today 2/22 (Bryan, Daniel W.)
Make modified dishes which will allow for the ice to rotate by the end of today 2/22 (Daniel C. Paulo)
Run test with ice using the new dish, by the end of the week 2/24 (Daniel C. Paulo)
Test beams with strain gauges and determine the most ideal size to use, by the end of the week 2/24 (Bryan, Daniel W.)
Brainstorm modification idea of the Hard Drive Tester (All)
Documenting each activities for use in final report (All)
Budget (list amount spent and amount remaining)
$20 – Shim stock
$80-$100- 3m 434 Vibration Damping Tape (in the process of obtaining sample)
$35 – Aluminum to fabricate new dishes
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 and all the presentations
CAD drawing on front page
Add actual pictures, video and more updated info (Paulo Daniel C.)
Report – keeping data and pictures of our preliminary tests for use in the report (Bryan and Daniel W.)