Thread subject: Homeroasters.org :: air roaster

Posted by dja on 08/28/2010 21:15
#1

here's where I am ar with this roaster idea that I have had for quite sometime. anyway I started this thing out after buying the pyrex tube that you will see in the included photo.

Anyway the thing is going to hopefully work basicly like a giant hot air popper, I tried it with about a pound of greens throwed in it, usign the shop vac to blow the beans around, had good circulation, so I will just have to see.

Anyway here's a picture of what i am trying to do.

Edited by dja on 08/28/2010 21:17

Posted by Koffee Kosmo on 08/28/2010 21:27
#2

Very good job

I am yet to start my air roaster that is based on Roaster Robs design
However at this stage I am still loving the results I am getting from my Hybrid Turbo roaster

KK

Posted by Unta on 08/29/2010 03:34
#3

very similar to a sketch I did a few months back when chad was designing his electric air roaster...just remember to gasket that glass in the top and bottom plates, it will expand. Awesome fab job.
sean

Edited by Unta on 08/29/2010 03:35

Posted by allenb on 08/29/2010 08:11
#4

Ditto on the great fab job!

What is your plan for dumping and heat source?

Allen

Posted by seedlings on 08/29/2010 15:32
#5

I am going to love watching this beast come together!

CHAD

Posted by freshbeans on 08/30/2010 05:57
#6

Looks very elegant! ....Video friendly in fact! -Scott

Posted by seedlings on 08/30/2010 06:56
#7

David, what's the bottom plate look like where the air comes up into the tube?

CHAD

Posted by dja on 09/03/2010 06:14
#8

here is what the (lets call it) the middle section. Looks like.
there is a peice of screen wire which is helt into the recess you see cut into the bottom of the part in the picture, it is helt in place by an aluminum ring that is helt in place by two set screws. right now the only change I see to the way it works is to change the screen from hardware cloth to stainless steel from Small Parts.com.
Once I am able to control the air flow I will know if I will have to change this to something else. so right now no reason to get expensive and buy the good stuff yet.

Edited by dja on 09/03/2010 06:20

Posted by dja on 09/03/2010 06:20
#9

top side of middle section, as they say at NASA the bean side.

Edited by dja on 09/03/2010 06:21

Posted by seedlings on 09/03/2010 06:24
#10

Wow. I lust for fabrication skills. Brilliant!

(waits for video)

CHAD

Posted by dja on 09/03/2010 06:37
#11

to answer Allen's question about dumping.
the top just sits on the heat section which is the bottom 4.5 inch tube, the top is heavy enough to sit there without moving, plus it sits in a 1/4" deep recess that I cut in the top plate of the heater section.
From what I learned yesterday I will be able to bring the air in from the side, and not have to go up thru the bottom which I didn't want to do as it would of added another 6" in height to the thing, and as it is its almost 3' tall (add some lights and call it a Xmas tree).
how to mount the heat coil, gonna have to cut the thing up and weld it inside that steel tube, then figure out how to string it for maximum coverage with the shortest possible amount of NiChrome. plus I need to find some ceramic pass thru insulators, of I guess I could just do it Junkyard and let the wires hang out the bottom, I already have a hole there that I used to bolt the plates together so I could mill em to the same size.

oh yea one more thing, anymore questions?


Now if I could just get back to melting Iron!

Edited by dja on 09/03/2010 06:41

Posted by dja on 09/04/2010 06:38
#12

while two of the last three brain cells were figthing for ownership of my body the other one has I think figured out how to mount the heating coil into the heater section of this nightmare that I have launched myself adrift in.

My main problem is I have about 6 feet of 19 gauge NiC coiled wire, now if I just start hacking on this I will end up with a whole bunch of little useless peices, and to the same point if I cut it in half I will either have two peices that won't make enough heat which I am going to have to start triming on and then we have the little short useless peices,

I guess just close my eyes and cut the thing didn't cost me anything, so if I stat long and keep shortening it somewhere I will find the correct length.

Posted by dja on 09/04/2010 06:48
#13

and I quote
The roaster-chamber base; Is that a little something you popped out of a CNC? Great funnel shape!! -Scott

no it wasn't cut on a CNC Machine, I turned it on a 9X20 lathe that I have.
The shape and size of the cone actually came from a plastic funnel that I bought at the grocery store and cut to fit inside the Pyrex tube and into a hole that was originally in the bottom plate on the tube.
the recess in the bottom came from the fact that I didn't want to have to turn almost and inch off of the bottom to thin it down, which would of left me with a one peice roaster, as it is I am easily able to change the screen to a differant size of from screen to a perferated plate. and it has a soft connection that dosen't require any latches due to the weight keeping it together.

have a nice day



Posted by freshbeans on 09/04/2010 06:52
#14

Dan posted this link recently. It's a great candy store plus some good charts and info. http://www.infrar...aters.com/

Edited by freshbeans on 09/04/2010 06:56

Posted by dja on 09/04/2010 06:59
#15

found that site like 4 years ago

Posted by dja on 09/04/2010 07:00
#16

matter of fact I need to order up some high temp wire and terminals from them, gotta be safe when playing with roasters you know

Posted by Unta on 09/04/2010 07:03
#17

yeah the whole privacy content thing is confusing..ive had my fair share of problems with it. video worked...movement looks good!how are you controling air flow?
sean

Posted by allenb on 09/04/2010 07:17
#18

dja wrote:

My main problem is I have about 6 feet of 19 gauge NiC coiled wire, now if I just start hacking on this I will end up with a whole bunch of little useless peices, and to the same point if I cut it in half I will either have two peices that won't make enough heat which I am going to have to start triming on and then we have the little short useless peices,



What voltage, 220, 221? What wattage?

Posted by dja on 09/04/2010 21:56
#19

Unta wrote:
yeah the whole privacy content thing is confusing..ive had my fair share of problems with it. video worked...movement looks good!how are you controling air flow?
sean


In the video I was trying to control by bleeding air off by holding the vac hose to the side, that won't work in the real world so vac will be plugged into the trusty variac.

Allenb wrote:
What voltage, 220, 221? What wattage?
I have to get the new cage build up for the NiC first, gonna make it adjustable length wise so I can shorten the NiC accordingly, then I'm gonna chop off a third of the coil and go from there, and its gonna be 220 VAC, I would rather have too much heat than barely enough.:Clap:

Edited by dja on 09/04/2010 22:03

Posted by dja on 09/09/2010 19:51
#20

AllenB, if you have a Sunbeam C-30 the guy at DaySeal has the new gaskets for them, anyone else out there that has this coffee maker and would like a new gasket contact www.DAYSEAL.com check out this site.

Edited by dja on 09/09/2010 19:53