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Heat Gun...Max Capability?
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| freshbeans |
Posted on 03/02/2011 07:55
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A few short videos;
1) Turned on the heat, I was a bit surprised by the increase in back-pressure. I expected some, but it caught me off guard a bit. I may drill a few more holes.
2) 1lb beanflow test...cold.
3) 2lb beanflow test...cold.
I don't intend to roast 2 lbs., but I was curious if it would sustain a plume. It did.
I don't have any plans to automate this thing, but how would the thermal expansion effect control systems when it comes time to control heat and airflow together? -Scott |
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| seedlings |
Posted on 03/02/2011 10:04
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Did the heat increase pressure by 15%? Wow.
How much chamber is above the bean bed? It looks like the top of your chamber gets smaller, which increases pressure - possibly enough pressure, combined with the height of expanded beans, to start launching them out. Have you tried bean flow with 1.75# of roasted coffee?
CHAD
Don't put the cart before the horse. Put the horse in the cart and listen to him say "weeeee" all the way down the hill.
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| freshbeans |
Posted on 03/02/2011 11:49
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Chad,
With a 1# load, I've 9" of space above the beans. The 3rd video is a 2# load(green)...(that was just to check the blower ability). That leaves no room. I might be able to pull off a 1.5#, but I think expansion will likely kill that option too.
1lb of beans creates 2" pressure, adding another 1" for every .5 lb after that. I tested all the way up to the 2lb load. All the other pressure you see is created below the distributor/perf plate.
I haven't hooked up an exhaust system yet, so that pressure has to be contended with as well.
Hopefully in the next 2 days, I'll actually roast some coffee!! -Scott |
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| allenb |
Posted on 03/03/2011 17:47
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Your rig is looking like it's getting ready to start making some smoke!
The plume is nice and I don't see much in the way of bounce. I can't wait to see this guy or gal in action cooking coffee.
Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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| freshbeans |
Posted on 03/04/2011 09:39
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Prepped for transport to the launch-pad. T minus 48hrs. -Scott
freshbeans attached the following image:
Edited by freshbeans on 03/04/2011 09:40
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| Ringo |
Posted on 03/04/2011 09:54
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I just see in a thousand year, somebody will dig this up. It will still be shiny and they will wonder what it was? Maybe they will turn it into a lamp for there spaceship. Really nice work!!!
Ringo
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
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| jkoll42 |
Posted on 03/04/2011 10:13
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Don't get too close to a border crossing or airport... TSA might get really "friendly" with you if they saw that!!!
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
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| seedlings |
Posted on 03/04/2011 11:36
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Maybe you posted this somewhere, but did you have the 'fittings' custom contoured, or are they off-the-shelf items?
The entire setup is off all of the following:
The chain
The hook
The charts
CHAD
Don't put the cart before the horse. Put the horse in the cart and listen to him say "weeeee" all the way down the hill.
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| freshbeans |
Posted on 03/04/2011 11:56
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The whole build will get broken down on the 'Max Heatgun, HRO' thread, but for starters...the housings are cocktail shakers. 1 right-side up, the other, upside-down. No custom fab work at all. Lowes, Target, Grainger. That's it. 1 drill press, 1 dremel.
...More to come -Scott
Edited by freshbeans on 03/04/2011 12:00
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| greencardigan |
Posted on 03/04/2011 13:49
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freshbeans wrote:No custom fab work at all. Lowes, Target, Grainger. That's it. 1 drill press, 1 dremel.
...More to come -Scott
That sounds like me. I'm loving it!! 
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| DavidG |
Posted on 03/04/2011 18:39
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Way to go, Scott!! She (he?) is GORGEOUS!!
DG
la cimbali m32 | la pavoni pub1 | yama + cory | chemex | AP | CCD
wbp1 | wepp1 | bm/hg | co hybrid (still coming soon...)
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| freshbeans |
Posted on 03/06/2011 11:51
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You're all very kind!!
....Sadly, not enough heat. Back to the lab.
Hopefully, a couple snips will do the trick, then back to testing. Cheers,-Scott |
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| freshbeans |
Posted on 03/07/2011 09:45
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Well, before I start snipping nichrome, I'm taking a step back. The heating coil is designed to deliver 650f at 40 cfm. If I'm not getting my temp, it's probably just too much airflow.
It fluidized 2 lbs, so i think that's a bit excessive. I only intended a 1 lb machine.
I've already added restriction to the distributor/perf, now I'm going to add adjustable restriction to the blower intake port. Naturally, that will recieve a gauge to go with it!!
With a bit of luck, that should tune this motor down to 40 cfm at a respectable pressure.
Any good (read cheap and easy) way to measure CFM? Thanks,-Scott |
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| Unta |
Posted on 03/07/2011 09:47
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Joined: 01/26/2010 17:44
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whats the diameter of the shaker?
sean
Sean Harrington
educate.
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| seedlings |
Posted on 03/07/2011 10:00
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freshbeans wrote:
Any good (read cheap and easy) way to measure CFM? Thanks,-Scott
With this you'd know the speed of the air flow, then multiply the speed by the area of your opening:
http://www.amazon...amp;sr=8-1
SCFM = V*A
where V is average velocity (feet per minute) and A is cross sectional area of duct (square feet)
CHAD
Edited by seedlings on 03/07/2011 10:01
Don't put the cart before the horse. Put the horse in the cart and listen to him say "weeeee" all the way down the hill.
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| freshbeans |
Posted on 03/07/2011 10:05
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Barely 5" This looks like the same one. 29.99ea @ Target.
I found nno US made sub:|
http://www.google...DcQ8wIwAg# -Scott
....Thanks Chad!!
Edited by freshbeans on 03/07/2011 10:06
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| freshbeans |
Posted on 03/08/2011 07:12
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From the 'Max Heatgun HRO' thread;
allenb wrote:
Were you successful with gaining more heat from your element?
Allen
Allen, the heat; I've tuned the motor in at 18" lift on the intake side, leaving me with 10" of pressure @ the plate. (11.5" with heat). It's just above minimum fluidization velocity. I've got 375f throughout the RC (no beans).
.....So that's it, after this test, I'll have to snip to get more heat. I really am shooting for things to be as 'off the shelf'
as possible. So I'll tinker a bit more before snipping.
On the topic of my goof-ups, I'll try to keep all the experiments on this thread, leaving the other a bit cleaner.
Tomorrow ....beans. -Scott
Edited by freshbeans on 03/08/2011 07:14
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| freshbeans |
Posted on 03/08/2011 12:32
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Is it possible that pressure drop is killing my temps?
I'm going from roughly 12" column below the distributor, to 2" column above the distributor.
Boyles Law? Thanks, -Scott |
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| jm82792 |
Posted on 03/08/2011 16:02
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greencardigan wrote:
freshbeans wrote:No custom fab work at all. Lowes, Target, Grainger. That's it. 1 drill press, 1 dremel.
...More to come -Scott
That sounds like me. I'm loving it!!
My kind of simplicity ! |
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| Unta |
Posted on 03/08/2011 16:09
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Joined: 01/26/2010 17:44
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could you explain how you understand boyles law to apply to this machine...
sean
Sean Harrington
educate.
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Marco.....