Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Drum Roasters
Who is here? 1 guest(s)
Page 2 of 2: 12
 Print Thread
Another electric 1kg roaster
danst
Top  #26 Print Post
Posted on 07/10/2020 2:59 AM
After some time I had a minor problem. The bearings were fast seized. The loud creaking tones were very unpleasant. I found, the problem is on the inner envelope on balls (there are 2 shields on every side) - a black layer on inner metal shield that crumbles with heat and causes the problem. I removed the shields with this layer and leaved only 1 metal shield towards the roaster?s body , the exterior site leaved open, for better cooling and greasing.
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
AlexMunt
Top  #27 Print Post
Posted on 07/19/2020 4:49 AM
Very impresive work Danst, the first roaster and the second! And all the improvements you have made.
I`m working on a similar project, building my own roaster, allmost the same size:220 x 220 mm drum, stainless steel 4mm not perforated, electric heat, 2,5KW, controled by TC+ Arduino kit and Artizan.

Thanks to Homeroasters.org for all, information, forum, comments, etc. I used a lot of information from here.

I have a question about a detail on how do you managed the thermal insulation. The silicone used to seal the walls on your roaster, is thermal resistent? Can you tell me some brand you have used, or name ?
Thanks.
Edited by AlexMunt on 07/19/2020 12:12 PM
 
renatoa
Top  #28 Print Post
Posted on 07/19/2020 6:00 AM
120x120 CM ? Shock Maybe machine footprint...

If related to drum size, and was an units typo, you meant "mm", then it's too small, means 1.357 litres, good for maximum 250 grams.

The closest figure good for 1 kg drum is 12x12 inches.
 
AlexMunt
Top  #29 Print Post
Posted on 07/19/2020 12:10 PM
Sory, it was my error in writing. I have made the correction in my post.

220x 220mm the correct dimention.


The footprint, like you have mentioned, is 120x40 cm more closer than the drum. smile Grin

Thanks for the Note renatoa!
 
allenb
Top  #30 Print Post
Posted on 07/19/2020 5:21 PM
Hi Alex,

In the interest of keeping individual build threads devoted to the original poster's project, it's best to PM the OP with any questions related to ones own build otherwise, a longer than desired set of back and forth's typically happen sidetracking the OP's thread off course.

But, please start a thread on your build so we can lend a hand and many will want to see it's progress. And, post lots of photos!
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
danst
Top  #31 Print Post
Posted on 07/22/2020 7:00 AM
The right answer is : with this 8.6x7.4 inch drum I have made some 1200g roasts, with no problems. But I feel, it is the maximum, on the rear perforated plate start some smallest / broken grains to fall out.
I believe with 2.5kW power it is possible to make 1kg roasts only very slow or with higher preheating temps and with more risk of scorching and ashy flavours.
The electric roaster with solid drum has the same needs on power as gas roasters.
On the next change, when the heating is gone (I don?t know when), I make surely 4.5 - 5 kW heating. Depending on power square load on tubular elements.
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
danst
Top  #32 Print Post
Posted on 12/27/2024 6:46 AM
After a long time I decided to "upgrade" my roaster.
I had stainless frontplate and drum (solid) with electric heating 3.8kW .
I think so my system was a bit rigid, reacting slowly on heating changes.
Primitive air preheating was useful, but not effective enough.

So my intention : better preheating and regular steel drum, no stainless, faster temperature changes.
Preheating is managed with second chamber in case (a la Kaleido Sniper) and additional insulator (armaflex). I can use preheated air or when needed direct air input on the backplate.
danst attached the following images:
finally.jpg initially.jpg
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
danst
Top  #33 Print Post
Posted on 12/27/2024 6:49 AM
I have now two new drums, solid and perforated. I had luck with diging up sheetmetal 2.5mm thickness with 2.4 mm holes. I was insecure with perforated drum performance, I made solid one too. I add a belt of solid on the perforated one for more mass.
I tried first the perforated one and I have no interest to change it. I am satisfied with resulting properties.
danst attached the following images:
1a.jpg 1b.jpg
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
danst
Top  #34 Print Post
Posted on 12/27/2024 6:54 AM
So, my feeling :

I cannot judge only by perforated drum since there are more changes. Drum material, preheating, perforation.

By seasoning I tried standard profile behaviour by 700g beans.
Preheating 195 C, rpm 70/75.

It can be the same preheating level or lower. No higher - only for more speed in roast.
Slightly less power needed.
There is lower maximum temperature in roaster (about 20 degree Celsius) for the same profile.
Quicker response on heating changes (20-30%).
Less airflow needed.
A bit better bean uniformity, no tipping, scorching.
About the same taste characteristics on the same profile.

It is said it must be more temperature, air, rpm with perforated drums, this is not my experience.
It can be differently by another configuration of drum and roaster as well as by gas heating.

I think by electric heating is perforated drum a good choice.

(This configuration has better function now, my ambient temp is about 10 deg. Celsius (50 F ?), heatless room)
I have now 4 temperature probes : MET,ET,BT and FT - frontplate outside, for better info of changing ambient conditions - my differences are from 50 (winter) to 95 deg. F (summer). No ideal for roasting.

An example of reaction on heating changes :
danst attached the following image:
2a.jpg
Edited by danst on 12/30/2024 3:34 AM
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
danst
Top  #35 Print Post
Posted on 12/30/2024 3:40 AM
BURNS manufacturer :
Instead of relying on the conductive heating from the inner wall of the drum, all BURNS Industrial Coffee Roasting Systems operate with a perforated drum. The perforated drum allows for more convective heat transfer during the roasting process. Through this increased airflow, the roaster can create a more even roast and a wider range of batch size flexibility. Additionally, the roasting process uses less heat than a traditional drum roaster.

I cannot disagree.
So all types of drums can exist and work.
1000g Ugly roaster, Bezzera BZ09 PID, Fiorenzato Doge 63 stepless, Mazzer Jolly(Mestre), T. Moccamaster.
 
Page 2 of 2: 12
Jump to Forum: