MyRoaster V2 (direct-drum)

Roasters and roasting

Moderators: GreenBean, Gouezeri, bruceb, CakeBoy

MyRoaster V2 (direct-drum)

Postby Joris » Wed May 21, 2008 10:09 am

So, here's some more info on the roaster I'm building. My other roaster (see some old thread somewhere on this forum) project has been abandoned since it had too many flaws.

The schematics drawing is not very detailed but gives the general idea. The upper frame with the drum and housing is going to be hinged on the bottom frame which contains the heat source. This means I can tilt the entire upper part to dump the beans in the cooler (not included in the schematics) when the roast is done.

The other pic shows a couple of the parts which are ready for assembling. The heat source in the photo is for testing only. The final heat source has a safety system to shut down the gas when there's no fire present and it also includes a thermostat to control the heat. It is much more work to fit it in the roaster though so that's why I am using a different one for testing.

I will fit a digital thermometer which uses a probe inside the drum to be able to check bean mass temp.

There is no chaff collector in the roaster since it is meant for outdoor use anyway.

I will update this thread during the process of building for those interested. Any comments or tips are always welcome :)
Attachments
roaster parts.jpg
roaster parts.jpg (73.98 KiB) Viewed 25466 times
Schets-rez.jpg
Schets-rez.jpg (24.04 KiB) Viewed 25466 times
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

RE: MyRoaster V2 (direct-drum)

Postby Neo » Wed May 21, 2008 10:20 am

Very nice...
Will you add a meter to check the pressure of gas supplied to the roaster? It might be easier to produce the similar result in later roasts. I mean, at different periods you can mark the amount of gas required for a certain effect. Unless the weather changes drastically, or else the readings should be the same.
Anfim supercaimano
Gaggia Baby
Cloth filter
Syphon
Lovely coffee from a great roaster
User avatar
Neo
 
Posts: 618
Joined: Mon Sep 10, 2007 5:45 pm
Location: Hong Kong

RE: MyRoaster V2 (direct-drum)

Postby Joris » Wed May 21, 2008 11:26 am

I hadn't thought about that but it is probably a good idea and won't be hard to do ... off to ebay to check for a suitable pressure gauge :)
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby Joris » Wed May 21, 2008 4:45 pm

After spending the afternoon with some metal, a grinding machine and my trustworthy welding machine I managed to get some more work done on the roaster. The hinges aren't fitted yet so the top portion is not attached to the bottom frame.
Attachments
1.jpg
1.jpg (84 KiB) Viewed 25417 times
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby lukas » Wed May 21, 2008 6:16 pm

Wow Joris, welcome back and please go on! I'd love to see it live when it's finished :)
Lukas

This week I like my coffee luke-warm.
--
Newest kit: Ghibli R-15
User avatar
lukas
 
Posts: 2798
Joined: Mon Jul 25, 2005 8:41 pm
Location: Germany

Postby CakeBoy » Wed May 21, 2008 10:38 pm

Great to see you back Joris! An impressive machine you've built there too. I guess you have a couple less suits of armour now? ;) :D
www.CakeBoy.co.uk
International muffin blagger

Iberital L'Anna 1 Gp Hand-Fill | Wega Orion 2 Gp | Bezzera 1 Gp | Rancilio Audrey PID | Spidem Trevi
Iberital MC2 Timed | Macap M4 DS & MXA DS | Mazzer SJ | Starbucks Barista Grinder (Dualit E60/Solis 166)
Pinhalense 2x500g Gas Batch/Sample Roaster | Gene Cafe | IMEX CR-100
Aerobie | eSantos | Zassenhaus | Bodum P/Over | Chemex | Hario Woodneck | Timer Filter
User avatar
CakeBoy
 
Posts: 10006
Joined: Tue Oct 18, 2005 10:43 pm
Location: Oxfordshire, England

Postby Joris » Thu May 22, 2008 5:51 am

lukas wrote:Wow Joris, welcome back and please go on! I'd love to see it live when it's finished :)


Maybe a homeroast/BBQ meet when it's up and running ?
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby lukas » Thu May 22, 2008 11:15 am

I'm all for it! Starting July, I could have some more time to spare :)
Lukas

This week I like my coffee luke-warm.
--
Newest kit: Ghibli R-15
User avatar
lukas
 
Posts: 2798
Joined: Mon Jul 25, 2005 8:41 pm
Location: Germany

Postby Aadje » Thu May 22, 2008 1:06 pm

I'll be there!
Bits 'n' pieces . . .

This week I am mainly saying hello to old friends
User avatar
Aadje
 
Posts: 3363
Joined: Wed Jan 25, 2006 11:21 pm
Location: Dubai

Postby Joris » Thu May 22, 2008 1:24 pm

Cool !... will start a seperate topic for this.....
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby Neo » Tue May 27, 2008 8:48 am

What kind of bearing are you using to support the drum?
Anfim supercaimano
Gaggia Baby
Cloth filter
Syphon
Lovely coffee from a great roaster
User avatar
Neo
 
Posts: 618
Joined: Mon Sep 10, 2007 5:45 pm
Location: Hong Kong

Postby Joris » Mon Jun 02, 2008 5:26 am

Heat resistant ballbearing in solid metal housing. Axis has contraweight equal to the drumweight.
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby BazBean » Mon Jun 02, 2008 5:52 am

is the top piece the chest plate from one of the famous suits of armour ??

jokes aside ...... nice work yet again
Knowledge can be absorbed, but passion cannot be taught !

La Spaziale S5,
La Spaziale EK 2 Group
k30 mahlkonig
Mazzer Jolly, Futurmat , MC 5 Iberital,
Brasilia RR, Macap Deli Grinder.
A growing Tamper collection
(Plus my own playground for the above- A Shop)
User avatar
BazBean
 
Posts: 1635
Joined: Sun Sep 25, 2005 6:41 am
Location: Scarborough UK

Postby Joris » Tue Jun 03, 2008 6:12 am

:D thanks
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Postby Joris » Wed Jan 07, 2009 4:34 pm

Well, it is finaly finished, it was finished before but there were a couple of things I redesigned.

The contra weight for the drum on the axis had to go, it made the top part too heavy. I have created rollers at the front of the housing to support the drum (very high heat resistant wheels and ballbearings).

The drum is driven by an 75 rpm motor which I reduced to 37.5 rpm by using 14/28 gears.

Added K type temperature probes (one underneath drum, one above drum and one in the drum). After a couple of tests I removed the one above the drum since I can't see the usefullness of it.

The burner had to be replaced, the one in the pics above was too weak. With 1 kg greens and an ambient temp of -2 Celcius it took me 23 minutes to reach 1th and another 7 to reach pos 2nd with burner full on all the time. Strange enough the coffee was still quite nice (no baked taste). Today I installed a burner which should deliver 5000 Watt which should be sufficient.

Tomorrow I'll try a couple of roasts with the new burner in place.

Here are some pics of the test with the previous burner:

Image


Image


Image


Image
Veni, Vidi, Imbibi Coffea !


Bezzera Lever Machine (customized)
Doserless Mazzer Major
"Juggernaut" Homebuilt Roaster
Aeropress, Vacpots, presspots and mokkapots
User avatar
Joris
 
Posts: 1786
Joined: Wed Dec 14, 2005 1:56 pm
Location: The Hague, Netherlands

Next

Return to Roasting - Equipment and Techniques

Who is online

Users browsing this forum: No registered users and 21 guests