Author |
Message |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
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Forum: Vacuum Forming & General Stuff Posted: Sat Aug 25, 2007 8:36 pm Subject: Thinking about a forced hot air oven |
also:
Would carbon monoxide be an issue ? You need to ventthe exhaust of the heater , no ?
I do the thermoforming in the garage or in the shed with the door open anyway. These heaters are ment ... |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
|
Forum: Vacuum Forming & General Stuff Posted: Sat Aug 25, 2007 5:37 am Subject: Thinking about a forced hot air oven |
One trickiness about convection is that the rate of heat transfer from the hot air to the less-hot plastic is VERY strongly dependent on the speed of air flow across the plastic. If you don't have ve ... |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
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Forum: Vacuum Forming & General Stuff Posted: Fri Aug 24, 2007 10:32 pm Subject: Thinking about a forced hot air oven |
Can you describe the shape that you're trying to form, and the uneven thickness that's a problem, without giving away your potentially patentable idea?
Basically itis a type of motorcycle sadllebag ... |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
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Forum: Vacuum Forming & General Stuff Posted: Fri Aug 24, 2007 10:05 pm Subject: Thinking about a forced hot air oven |
Here is a gas powered radiant option that looks like it would be an easy build:
http://www.mrheater.com/productdetails.asp?catid=44
The only alteration that would be needed is rotating the safety ... |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
|
Forum: Vacuum Forming & General Stuff Posted: Fri Aug 24, 2007 9:24 pm Subject: Thinking about a forced hot air oven |
I can't show pictures only because it is a potential buisness idea that I *may* persue a patent for.
The type of heater I am talking about using is a Shop Heater that put out about 60k btu's run by ... |
Topic: Thinking about a forced hot air oven |
Boxjoint
Replies: 9
Views: 3436
|
Forum: Vacuum Forming & General Stuff Posted: Fri Aug 24, 2007 8:46 am Subject: Thinking about a forced hot air oven |
I am thinking about running a forced hot air "Reddy Heater" for my oven on the new machine. I would run some dubble walled duct work to the oven surface and then either make a diffuser or be ... |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
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Forum: Vacuum Forming & General Stuff Posted: Wed Jun 20, 2007 5:40 pm Subject: 2 vac pumps = more CFM? |
I was working on a saddle bag for my motorcycle. Approx 13" high x 24.5" long x 6" tall. Solid mold. It took about a second to three seconds total. Again, I was using a very very rough ... |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
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Forum: Vacuum Forming & General Stuff Posted: Thu Jun 07, 2007 12:13 pm Subject: 2 vac pumps = more CFM? |
24x36
The sping in the check valve worked well with my 5hp shop vac. Don't forget, I would use this in conjunction with the two stage ball valve so even if it leaks a tad it will only be between swit ... |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
|
Forum: Vacuum Forming & General Stuff Posted: Thu Jun 07, 2007 9:03 am Subject: 2 vac pumps = more CFM? |
Ohh well, the diagrams did not work but you get the idea!
You need to put them between CODE and /CODE tags. (With square brackets around each tag.) That tells the software to use a fixed-wid ... |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
|
Forum: Vacuum Forming & General Stuff Posted: Thu Jun 07, 2007 9:02 am Subject: 2 vac pumps = more CFM? |
I've thought about drilling a new hole in a big plastic ball valve, too...
One thing to be careful about is that the hole through a full-ported ball valve is really big (relative to the size of the ... |
Topic: For those who want to build multi holed plenum tables |
Boxjoint
Replies: 2
Views: 2918
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Forum: Vacuum Forming & General Stuff Posted: Tue Jun 05, 2007 9:22 pm Subject: For those who want to build multi holed plenum tables |
Youre welcome.
I will be using the 24x24 but in .125 (1/8") with 1/8" holes.
57$
Not bad for a sturdy as hell platform that saves a lot of work drilling. |
Topic: For those who want to build multi holed plenum tables |
Boxjoint
Replies: 2
Views: 2918
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Forum: Vacuum Forming & General Stuff Posted: Tue Jun 05, 2007 8:05 pm Subject: For those who want to build multi holed plenum tables |
An on line metals retailer I use now offeres "Prefforated Sheet"
In Aluminum, Steel and Stainless Steel
When I build my new machine I will be using this stuff.
Here is the link:
http ... |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
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Forum: Vacuum Forming & General Stuff Posted: Mon Jun 04, 2007 10:53 pm Subject: 2 vac pumps = more CFM? |
Here is a pic that might help:
http://home.comcast.net/~swilliams620/vac1.bmp
http://home.comcast.net/~swilliams620/vac2.bmp |
Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
|
Forum: Vacuum Forming & General Stuff Posted: Mon Jun 04, 2007 10:30 pm Subject: 2 vac pumps = more CFM? |
Ohh well, the diagrams did not work but you get the idea!
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Topic: 2 vac pumps = more CFM? |
Boxjoint
Replies: 13
Views: 4806
|
Forum: Vacuum Forming & General Stuff Posted: Mon Jun 04, 2007 10:26 pm Subject: 2 vac pumps = more CFM? |
I'm almost embaressed to post pics of my setup because it is soo rough
BUT
Here is how I have it set up:
I have a large PVC check valve going to my shop vac with a hole drilled and tapped for the ... |
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