Talk:Toaster

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Revision as of 06:27, 28 September 2008

Discussion of Presentation on Wednesday, September 24, 2008:

 12:38:44 PM : Do you think that the power consumption curve is linear over the duration of the cycle? That is, does the wire resistance change as the coils heat up?

 1:19:17 PM: It was a little unclear sitting towards the back of the room looking at your pictures, but how easy are the "tabs" to manipulate if you are a plant worker assembly many of these toasters every day?

 2:46:58 PM: You went over the manufacture of the metal casing and most of the interior structure, but how is the mica insulating plate made? 

 4:55:44 PM: If the most likely failure is in the handle, did you notice any design features that were incorporated to account for it?

 8:00:49 PM: Overall, I thought your presentation went pretty well, but I do think you shouldn't have gone as far into detail about how the toaster works as you did.  Maybe it was necessary to explain some of the things you wanted to talk about, but it seemed to take up a lot of time and didn't really help me much.

 9:05:28 PM: In class, you responded to my question about the timer, saying that on a cold day, the toaster, if adjusted for hte first piece of toast coming out properly, will cause the second to come out underdone. Would it be possible perhaps to add a preheat cycle to the toaster for just a matter of seconds? And from then on have the timer work correctly for a given darkness of toast?

 9:39:28 PM: I remember when I was little, we had this really old toaster that wouldnt go up all the way when it was done.  Instead it would get caught half-way up and would continue to toast.  I was toasting bread once, forgot about it, and next thing I noticed the toaster caught fire.  Long story short, I freaked out, but I thought this story may be a bit of interest to you.

 11:36:45 PM: Have you guys thought about modifying the lifting (?) mechanism (the structure that pops out the toast when it is cooked) so that the user can stop the toaster and take the toast whenever he/she wants?

 8:17:00 AM: I thought the pictures were good, the presentation I felt went in a little too much detail. I rather have heard less detail and more content on the big picture.

 9:27:00 AM: Do all toasters typically use a nichrome wire element mounted to mica, or are there toasters that use heavier elements as well?

Client Comments on the Mechanical Analysis

In this report, the toast shelf is selected as the major component for an finite element stress analysis. The report pointed out that the failed toast shelf would make the toaster become a potentially dangerous appliance. However, I would like to see more explanations about why the toast shelf failure can cause such serious a problem because it is not included in your FMEA.

As a client, I would like to see more professional details in your analysis. The following information should be included:

• The finite element software and version you used for the analysis.
• The material property settings: for example, the values of tensile strength, Young’s modulus and poisson’s ratio.
• Please describe more about your boundary condition settings.
• The maximum applied force to cause the toast shelf failed.
• Plus, if the toast shelf material is aluminum, you may want to consider the offset effect on elastic limits if necessary.
• The report indicated that the long recess helps improve lateral stiffness. In order to demonstrate the difference, please provide the analysis results for the similar design without the recess.