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Is vacuum cleaner motor ok for fb roaster?
walk
Top  #1 Print Post
Posted on 02/17/2022 12:22 AM
Can vacuum cleaner motor (600W?!) be used for fb roaster? Is the amount of air enough?

The roasting chamber is ID 80 mm and 310 mm high glass tube. Air inlet hole diameter 28 mm. Plan is to get 250 g green beans at least.

For example:

https://www.aliex...12970.html

Thank You!
Edited by renatoa on 02/17/2022 3:10 AM
 
renatoa
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Posted on 02/17/2022 3:23 AM
Is overkill, check here how 250 grams are lift by an 110-130W air pump.

https://www.youtu...I&t=3s

The pump is for camping/pool/airbed inflate. Check Bestway Sidewinder AC Air Pump on Amazon.
 
allenb
Top  #3 Print Post
Posted on 02/17/2022 7:53 AM
Wow, I love this air pump! Great find. If he needs 220 V single phase, do they come in a high voltage model?
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
renatoa
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Posted on 02/17/2022 8:39 AM
There should be models for US market too, on 110V, if this is what you mean...
I found something similar on Amazon.com:

https://www.amazo...086WJWDHW/
 
walk
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Posted on 02/17/2022 9:34 AM
Thank you!
 
walk
Top  #6 Print Post
Posted on 02/17/2022 9:45 AM
Can you guess what might be the max green beans amount of my ID 80 mm X h 310 mm roasting chamber?
 
renatoa
Top  #7 Print Post
Posted on 02/17/2022 10:04 AM
Nope, sorry... guesses aren't my strong ability.
What I can tell you for sure is the glass in the video is similar with yours, because the cocktail shaker funnel is 80-82 mm diameter.
And the fan power at start is 100%, as you can see on controller display.
So the margin to add some greens is very low, maximum 50 grams more, "I guess" Grin

What I want to emphasize with this example was how low you can go with the fan power, compared to what you asked.
500 Watts seems more appropriate for one pound of greens, and using proportionally bigger glass.
 
allenb
Top  #8 Print Post
Posted on 02/17/2022 10:19 AM

Quote

renatoa wrote:

There should be models for US market too, on 110V, if this is what you mean...
I found something similar on Amazon.com:

https://www.amazo...086WJWDHW/


The vacuum motor walk had linked to was a 220V motor so I had assumed he/she needed to keep the build at 220V so was wondering if there was a 220V version of the air pump available. If walk will need 220V, I'm sure there must be a EU version of the air pump.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
greencardigan
Top  #9 Print Post
Posted on 02/17/2022 11:19 PM
I use a 600W vacuum motor on my 300g roaster. Yes, it's overkill, but usable (just). I start the roast on 20% airflow and end on 12%.
 
walk
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Posted on 02/18/2022 5:00 AM
This creates a good idea of my need, Thank you!
What is your rosters heating power and how many percent max is used?
 
greencardigan
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Posted on 02/18/2022 5:02 AM
1800W and running up to about 95%.
 
walk
Top  #12 Print Post
Posted on 02/18/2022 5:24 AM
Great, thank you!

I need to design a heater holder. I plan to fit a temperature sensor between the heater and the inlet, which takes about 20 mm. Should this distance be increased for any reason?
 
renatoa
Top  #13 Print Post
Posted on 02/18/2022 5:35 AM
I see on amazon cordless vacuum cleaners rated 300W, sounds as the right power you need... maybe their motors are available as spare.
But they are DC, if this matters...
 
walk
Top  #14 Print Post
Posted on 02/18/2022 5:48 AM
At the moment I am thinking about use of that:

https://www.aliex...C&mp=1

1. The body fits well to my plans
2. 24VDC 6A makes 144W, and it should fit good.
3. Should be easy to control with TC4+ PWM
4. No brushes! I prefer brushless motors noise and brushes makes also smell.
5. The whole motor is isolated from air flow.
6. The motor cooling will be great.
Edited by renatoa on 02/18/2022 6:50 AM
 
renatoa
Top  #15 Print Post
Posted on 02/19/2022 8:33 AM
Puzzled how you plan to use/mount this motor in a FB...
Maybe you aren't aware that the small center 23 mm round opening is for suction, not for exhaust of the air !
If you plan to mount the heater on top of that opening, won't work.
 
walk
Top  #16 Print Post
Posted on 02/19/2022 10:07 AM
One picture is a thousand words. I'm planning something like this right now.
walk attached the following image:
uus_alusplaat-ist_kokku_v6.jpg
 
renatoa
Top  #17 Print Post
Posted on 02/19/2022 11:14 AM
Can't comment, quite unusual design...
 
walk
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Posted on 02/19/2022 2:01 PM
Uncut view
walk attached the following image:
uus_alusplaat-ist_pilt.png
 
walk
Top  #19 Print Post
Posted on 04/01/2023 3:13 AM
Hi! A year's break came in, but now things have come together. Everything works, the result is consistent, but there is still a lot to learn. The first major confusion is with temperatures. 205C drop is a very dark roast, 180C seems about right?!

So
walk attached the following image:
1_24.jpg
Edited by walk on 04/01/2023 1:13 PM
 
renatoa
Top  #20 Print Post
Posted on 04/01/2023 8:00 AM
Where is the probe location (and type), that records the above temperatures?

180 C is too low even for first crack, 200 C is the most popular value, adopted by the great majority as a "standard" for start of development phase.
Drop temperature depends on the desired roast degree, check the linked/attached scale
https://library.s...olor-card/
renatoa attached the following image:
sweet-marias-roasted-coffee-color-card-v4-back.jpg
 
walk
Top  #21 Print Post
Posted on 04/01/2023 8:32 AM
I would like to add photos, but for some reason it doesn't work. Any thoughts?
 
allenb
Top  #22 Print Post
Posted on 04/01/2023 10:13 AM
Here's a good tutorial in our FAQs

https://homeroast...?cat_id=16
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
walk
Top  #23 Print Post
Posted on 04/01/2023 1:18 PM
Some more
walk attached the following images:
5_10.jpg 4_19.jpg 3_23.jpg 2_27.jpg 7_10.jpg 6_14.jpg 9_1.jpg 8_3.jpg
Edited by walk on 04/01/2023 2:05 PM
 
HarryDog
Top  #24 Print Post
Posted on 04/01/2023 1:23 PM

Quote

walk wrote:
The first major confusion is with temperatures. 205C drop is a very dark roast, 180C seems about right?!
So


I found the probe placement to be an issue, if in the middle from the top just into the bean mass gave me very close temps to what people post for roast temps, I thought on the side just out of the air low would be best? Well this placement gives me temps about 15-20C below reported FC temps.

I mark FC and time or use temp from then on to get to the roast level I'm looking for.

Picture of my probe placement. Probe is 1 inch in length.
HarryDog attached the following image:
probe2_1.jpg
 
HarryDog
Top  #25 Print Post
Posted on 04/01/2023 1:26 PM
Walk, very clean looking roaster, probe placement is much like mine and it's behind 15-20c on my roasts.
 
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