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dman
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Joined: 09 Oct 2006
Posts: 34
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 Posted: Wed Nov 15, 2006 10:34 am Post subject: 24x48 oven idea |
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I am making a 24x48 flip top nachine and was wondering about the oven. I have been reading up on how to measure the ohms and do the caculations to do it correctly. I am going to run 2 20 amp circuits dedicated to the machine but I was wondering if instead of making it in 2 "halves", could I run the outside 2 rows (or however it works out according to the calculations) on one circuit and running everything in the middle on the other. I figure that I could turn them both on to preheat and then turn the center off and just heat the edges for a minute or so before I turn on the second citcuit and heat the middle. I'm not sure if it makes sense to everyone else but it makes sense in my head. Of course I have voices there all of the time talking to me. 
Also I am thinking of putting 8" sides on the oven to accomodate for the extra sag. Does that sound about right? |
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drcrash
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Joined: 04 Sep 2006
Posts: 705
Location: Austin, Texas
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| Posted: Wed Nov 15, 2006 11:13 am Post subject: |
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| Quote: | | I am going to run 2 20 amp circuits dedicated to the machine but I was wondering if instead of making it in 2 "halves", could I run the outside 2 rows (or however it works out according to the calculations) on one circuit and running everything in the middle on the other. |
That sounds like a good idea to me. I think Harley Guy may have done it that way; you might want to ping him with a PM or email.
Another thing some people do is to make one or both ends a separate zone, so that you don't have to have them on if you're heating a small piece of plastic and only need the middle of the oven.
Unfortunately, combining those two things is a little tricky. If you turn off the end(s) zone, you don't get the extra-edge-heat at the ends of the ends. So you might want the middle part to have an extra zone for edge heat where the edge is when you're only using the middle... bleah.
I'm thinking of building a modular 3-piece oven, and physically adding/removing the middle part when I want a larger/smaller oven. (Butting the end parts together when the middle part isn't there.) That way the ends would stay ends. That makes sense for me, because I'd like the whole machine to be actually compact most of the time, but it'd likely be too much hassle for somebody who has room for a full-sized machine. Flipping a switch or two to reconfigure the coils would be simpler. |
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jegner
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Joined: 30 May 2003
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Location: Texas, USA
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dman
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Joined: 09 Oct 2006
Posts: 34
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| Posted: Wed Nov 15, 2006 3:46 pm Post subject: |
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| What about the hardi backer on the walls, would you make it 8: on this oven? |
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harley guy
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Joined: 25 Nov 2005
Posts: 71
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| Posted: Sun Nov 19, 2006 6:57 pm Post subject: |
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| good idea.i did it with running it with one 30 amp outlet.not with 2.all i did was shorten the wire and stretched tighter on the last to outer rings.so the outer 2 rings would he hotter then the center.it works awesome for heating evenly.i dont waste no plastis from uneven heating because of it.i have a thread some were on how i did it.but it should work the same with 2 outlets,but might be to much power for the wire to handle,might melt wire.you could try |
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drcrash
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Joined: 04 Sep 2006
Posts: 705
Location: Austin, Texas
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| Posted: Sun Nov 19, 2006 9:01 pm Post subject: |
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I think this is the older thread Harley Guy's talking about:
http://www.tk560.com/phpBB2/viewtopic.php?t=351
The outer two rings of a TJ oven get about half the wire, so there's a natural split there if you want to go for two approximately equal zones. |
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dman
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Joined: 09 Oct 2006
Posts: 34
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| Posted: Thu Nov 23, 2006 5:04 pm Post subject: |
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Sorry for the slow reply, we just got back into town. For a night anyway.
Harley(or actually anyone that has a 220v oven), did you wire your's 220? If so do you have one hot wire at one end and the other at the other end? Or are they staggered? According to the layout drawing from the calculator, A and C are white and B and D are black. I'm not sure if it is saying to stagger them or just showing where to make the connections for the sections. I'm still a little unsure about exactly how to physically wire it up. |
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