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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Aug 25, 2011 10:28 pm 
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Lets work backwards and determine the range of materials we would like to use in it then we can calculate the required power needed.


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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Aug 25, 2011 10:34 pm 
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Location: downtown Saint Paul
the spiral heating elements from a stove were my first thought as well.

Then I thought, how about the heating elements from ovens?

I expect both might work.

a gas burner might be an option too.

I'm excited about this build, and glad to see posts in here!

Riley

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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Fri Aug 26, 2011 12:48 pm 
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Not that I am an expert on this, but I was a fry cook back in the 80's.

Heat lamps have two issues from what I can see, first is that they radiate heat in a circle, so covering overlapping zones means many more lamps, where wire or a heating element can just be aligned closer.

Second is that they are very expensive both cost and power consumption. Now I know our power is paid for, but still I think to get the 20 lamps we would need to build a larger table, it makes much more sense to go with the NiChrome or with what Jude had originally thought was to raid the elements from a couple of old electric ovens.

Now I know we can find ovens on Craigslist, or Freecycle, but it of course would be more work than the Wire. I do have some free time at the moment, so if we want to go with stoves, we can talk to Jude who had a couple of possible sources and pick those up, or find others.


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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Wed Aug 31, 2011 1:42 pm 
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I've seen spools of nichrome on eBay for uber cheap before (shipping is the real issue there) useful stuff to have handy if we get a spool. I would use the stock toaster zig zag for the pattern, that's just one length on the side lines and 9 side lengths at 6" apart. That's a good 40' of wire. You likely are going to want to put a fan (or fans) on the other side of that to circulate the heat and keep it blowing on the plastic.

Man, I haven't done vacuum forms since shop class at school! :D

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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Wed Aug 31, 2011 3:33 pm 
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Here's an idea:

http://hackaday.com/2011/08/31/how-to-b ... very-time/


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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Wed Aug 31, 2011 5:22 pm 
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smittex wrote:


I think the best part was the link in the comments to here,

http://tk560.com/vactable4.html

which looks like pretty much what the group is talking about, it reminded me too that I may have the perfect stand-offs for the nichrome. I'll bring some in for folks to check out.

Pete


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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Sep 01, 2011 10:42 am 
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Location: downtown Saint Paul
looks like you can get nichrome wire , 22 gauge, at $20 for over 100 feet.

If that will do the job, sounds like the way to go.

Riley

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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Sep 01, 2011 11:33 am 
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Joined: Tue Jan 13, 2009 5:47 am
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Location: Minneapolis
There was some 22 gauge nichrome on the junk shelves in a small orange plastic bag, though I imagine it might have gotten thrown out.

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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Sep 01, 2011 12:11 pm 
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Joined: Sat Jul 17, 2010 5:13 pm
Posts: 246
Location: Minneapolis, MN
jwb wrote:
There was some 22 gauge nichrome on the junk shelves in a small orange plastic bag, though I imagine it might have gotten thrown out.


Negative, I believe I placed it on the tool shelf thing, near where the foam cutter is hanging.

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 Post subject: Re: Group Build - Vacuum Form Table
PostPosted: Thu Sep 01, 2011 12:32 pm 
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Location: Minneapolis
Good man!

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