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MatthewV
Daedalian Member :_

 Posted: Wed Aug 24, 2011 6:55 am    Post subject: 1 So here is a challenge: I am making a dodecahedron with stained glass pentagons. The edge of each piece is five inches. How much will the entire piece weigh? Standard stained glass is being used. Each piece uses 12-14 feet of copper foiling and solder. I will happily answer any questions to the best of my ability. The person who gets the closest will get a prize of some sorts. I hope people take the time to calculate out something. This is an engineering problem; you have full access to any resource you want. The deadline is when I finish the project, hopefully mid-September. Guesses my be submitted by PM or posted in the thread. If you post in the thread, expect other people to see it.
bgg1996
BeeGees are awesome!

Posted: Wed Aug 24, 2011 8:08 am    Post subject: 2

 Quote: I will happily answer any questions to the best of my ability.

How much will the entire piece weigh?
_________________
The one member below 18
3iff
very unbifflike

 Posted: Wed Aug 24, 2011 8:46 am    Post subject: 3 Isn't that cheating?
MatthewV
Daedalian Member :_

Posted: Wed Aug 24, 2011 9:00 am    Post subject: 4

bgg1996 wrote:
 Quote: I will happily answer any questions to the best of my ability.

How much will the entire piece weigh?

It isn't cheating because I don't know the answer.
I'm guessing a few pounds.
MatthewV
Daedalian Member :_

 Posted: Wed Aug 24, 2011 9:07 am    Post subject: 5 How thick is the glass? I havent measured it and there is some variations in the thickness. The copper foil is 7/32 of an inch and it is about twice the width. Some of the pieces have more texture than others. The clear glass has little bumps. Do you have data on the mass of a square inch of glass. No I don't. It is normal glass as far as I know. Is this 'bought' glass or home/custom made? The glass was purchased. How thick and wide is the copper foil? 7/32 wide and 1.2 mils thick. What is the solder made of? I only use a lead free solder. Lenox brand, the same stuff used on copper water pipes. I take it that there will be a number of glass pentagons that will be joined together by copper/solder into a large 'glass' dodecahedron? Yes, there will be 12 pentagons that will be joined with solder to form the dodecahedron. There will be no openings and it will be empty inside. And the weight will be taken with some scale at UAF.
3iff
very unbifflike

 Posted: Wed Aug 24, 2011 10:51 am    Post subject: 6 Any idea how much solder (length of solder wire) you might use for one panel? At the moment my 'estimation' is using far too much...
Zag
Tired of his old title

 Posted: Wed Aug 24, 2011 12:56 pm    Post subject: 7 Experimental evidence is going to be far more valuable than theoretical, because you'll have to make too many assumptions in the application. So, you've made a bunch of these starfish pentagons so far; how big is one of those and how much does it weigh?
MatthewV
Daedalian Member :_

 Posted: Wed Aug 24, 2011 6:30 pm    Post subject: 8 I don't really know how much solder is used. A few feet from the roll on each pentagon? I don't know how much they weight. Every edge is 5 inches long. And I think that with the correct assumptions, one could get an answer within a quarter pound or less.
itisally
Master of Disguise

 Posted: Thu Aug 25, 2011 2:57 am    Post subject: 9 Do you have the model number of your solder?_________________I could agree with you, but then we would both be wrong.
MatthewV
Daedalian Member :_

 Posted: Thu Aug 25, 2011 6:42 am    Post subject: 10 Lets see... there is WS15086 and WS15041. I think the project will finish under the WS15086 solder. I am not keeping track of how much solder is used. I use solder for other projects and have already purchased 8 lbs for future projects.
Courk
Daedalian Member

 Posted: Thu Aug 25, 2011 7:38 am    Post subject: 11 Where are you getting the glass? What's the item number on it?
MatthewV
Daedalian Member :_

 Posted: Thu Aug 25, 2011 5:38 pm    Post subject: 12 I purchase it locally so there really isn't an item number. I couldn't get similar pieces unless I took a scrap piece to the store. This isn't a lateral! Counting the number of bumps isn't going to get a better answer!
MatthewV
Daedalian Member :_

 Posted: Wed Aug 31, 2011 7:24 am    Post subject: 13 All the panels are complete. I don't have very many guesses... Considering the wide range of calculated answers, a reasonable random guess does have a good chance
MatthewV
Daedalian Member :_

 Posted: Wed Sep 07, 2011 6:58 pm    Post subject: 14 I have started to assemble the pieces!
3iff
very unbifflike

 Posted: Thu Sep 08, 2011 6:55 am    Post subject: 15 Good luck...don't drop any of them... But if you do, weigh all the bits.
itisally
Master of Disguise

 Posted: Fri Sep 09, 2011 6:20 pm    Post subject: 16 I am really anxious to know how close we all are. I hope the assembly if going well. I took lots of liberties in my calculations, and I hope that my guesses are not too far off._________________I could agree with you, but then we would both be wrong.
MatthewV
Daedalian Member :_

 Posted: Fri Sep 09, 2011 6:40 pm    Post subject: 17 I will weight it soon!
itisally
Master of Disguise

 Posted: Fri Sep 09, 2011 6:53 pm    Post subject: 18 Breath taking!_________________I could agree with you, but then we would both be wrong.
MatthewV
Daedalian Member :_

 Posted: Fri Sep 09, 2011 7:11 pm    Post subject: 19 Lets see.. I have guesses from MatthewV JaneV (my mother) ThomasK (Facebook) AndrewV (a brother) JohnV (another brother) itisally 3iff
bgg1996
BeeGees are awesome!

 Posted: Fri Sep 09, 2011 7:48 pm    Post subject: 20 Didn't I send one? Right above 200?_________________The one member below 18
MatthewV
Daedalian Member :_

 Posted: Fri Sep 09, 2011 9:18 pm    Post subject: 21 Yes, as it was planet dependent I guess I didn't take it seriously enough... OK, I added you.
bgg1996
BeeGees are awesome!

 Posted: Wed Sep 21, 2011 11:18 pm    Post subject: 22 How soon is soon for you?_________________The one member below 18
MatthewV
Daedalian Member :_

Posted: Thu Sep 22, 2011 6:12 am    Post subject: 23

This horrible thing called depression came upon me last week. Thank you for the reminder.

 Code: MatthewV   8.114 lb JaneV     10.8 lb ThomasK    5.93 lb AndrewV   12.74 lb John V    11.8 lb itisally  7.024510595 lb 3iff     16 lb bgg1996 200 lb

Based on my preliminary weighing with a bathroom scale, itisally is going to win.
bgg1996
BeeGees are awesome!

 Posted: Thu Sep 22, 2011 9:00 pm    Post subject: 24 I definitely did something wrong in my calculations..._________________The one member below 18
MatthewV
Daedalian Member :_

 Posted: Thu Sep 22, 2011 9:11 pm    Post subject: 25 Were you thinking it was a solid piece??
bgg1996
BeeGees are awesome!

 Posted: Thu Sep 22, 2011 9:51 pm    Post subject: 26 What I think might have happened was I may have converted square inches to square feet by dividing by 12._________________The one member below 18
itisally
Master of Disguise

 Posted: Mon Sep 26, 2011 4:30 pm    Post subject: 27 When I saw the picture I really thought that I was way too heavy. I must have made a few good guesses. _________________I could agree with you, but then we would both be wrong.
itisally
Master of Disguise

 Posted: Thu Oct 13, 2011 1:35 am    Post subject: 28 I was wondering if you forgot about us with that crazy rule game. Any final number?_________________I could agree with you, but then we would both be wrong.
carrier_of_the_arch
Daedalian Member

 Posted: Fri Oct 14, 2011 12:48 am    Post subject: 29 That dodecahedron really is quite a beautiful bit of work, well done!
itisally
Master of Disguise

 Posted: Thu Oct 27, 2011 2:29 am    Post subject: 30 Hate to nag, but.... Did you get a final weight. Honestly, I talked to my dad about it and we are just wondering how it came out._________________I could agree with you, but then we would both be wrong.
MatthewV
Daedalian Member :_

 Posted: Thu Oct 27, 2011 9:10 am    Post subject: 31 Persistance is a wonderful quality for other people to not have! 3217 grams. So 7.092 lb
MatthewV
Daedalian Member :_

 Posted: Thu Oct 27, 2011 9:12 am    Post subject: 32 Oh, and if you send me an address, I will mail you a nice handmade ceramic bowl. You may request a particular design but then it will take a few more weeks :-) Or maybe it will be a cup/saucer.
itisally*
Guest

 Posted: Sat Oct 29, 2011 3:16 am    Post subject: 33 Wow! That was close. I was pretty sure I had over estimated the glass.
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