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03/04/2021 9:04 PM
I have been trying Scott Rao Hario V60 pourover this week. 1:17 and blooming with 2 parts water the first 45 seconds then splitting the rest into 2 pours. A little stirring is included. We like it.

03/04/2021 11:35 AM
My brew ratio is 1:17 (exactly 59.5 g/L). That's roughly 8.5g per 5-oz cup.

02/27/2021 9:29 AM
I'm looking to hire someone to teach/help me to find the best roast profile for the 3 types of coffee that grow on my farm in nicaragua. I live in LA, but but could go anywhere in so cal with my Behmor for a roasting lesson. Please contact me if you're in

02/17/2021 7:20 PM
When your wife thinks 30 grams for a 6 cup setting is strong, you learn to drink muddy water when you are making coffee for both of you.

02/17/2021 8:32 AM
I use a rule of thumb of 60 grams per liter. 8 cups (1 liter, 32 oz) = 60 grams, 6 cups (3/4 liter, 24 oz) = 45 grams. 10 cups = 75 grams 12 cups = 90 grams

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Twin Turbo Roaster
Koffee Kosmo
As Home Roaster members
You are the first to see my design thoughts of the Twin Turbo roaster and possibly help with tweaks, suggestions

All help will be appreciated

I am trying ta achieve up to a 1.5 kg roast

Basic design idea is as per concept drawing below (currently as a drum type)

Three types of roaster can be made with this design

1) Drum type

2) Open drum agitator type (similar to my current set up)

(And for CHAD - just to give him something to think about)

3) This idea may also apply to a tube type Air Flow roaster with good air and heat directional baffle design

And I am very tempted to go with the air flow design
Decisions, Decisions

The box section is a double wall with insulation inserted between the 2

The twin tubes will house 1 x each a 1200W heating element
Above the heating elements are 1 x each variable speed fans



Questions
I am toying with the idea of making the square section (heating chamber) out of carbon fibre just to keep the weight down

Will carbon fibre handle the heat, stress, and will it give off harmful chemicals ??

Or should I go the tried and tested steel construction method?

Again comments and suggestions welcome B)
KK
Koffee Kosmo attached the following image:
img_twinturboroaster.jpg

I home roast and I like it. Designer of the KKTO
Roaster Build information
https://forum.hom...ad_id=1142

https://docs.goog...lide=id.i0
Blog - http://koffeekosm...gspot.com/

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
farmroast
Hey KK
I too am considering building a larger capacity roaster. Some of my considerations are:
1: Heat application MUST be even to the bean mass and controllable, (The larger the batch the more important this is. I've found this to be key to roast quality with my roaster and a shortcoming in many roaster designs)
2: With electric heat source, heat needs to be conserved/contained and insulation helps too.
3: Generally I think mechanical agitation/lofting like used in our roasters or a drum are more easily controlled than fluid bed using air.
4: Should consider a combination of convection, conduction and radiance to effect roast quality, profiles and achieve maximum efficiency.
I think 2-1200w elements should be able to roast close to 1 1/2Kg with good profiling. I'm looking at 3000-3500w to roast 2+Kg
Edited by farmroast on 04/14/2009 11:36 AM
Ed B.
DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/
seedlings
KK, you could use a pair of heatguns instead of Turbo Oven units.

It would be easy to get some nichrome and build elements, or you could use a combination of 500W and 300W halogen bulbs (which would make viewing fun!). If I were building a drum roaster, I'd try halogen.

Or, if you want to get REAL fancy, why not replicate Probat's Tangiential designs?

http://www.probat...er-en.html

http://www.probat...piter.html

CHAD
Edited by seedlings on 04/14/2009 3:59 PM
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
qajariaq
I will say that carbon fiber would look very nice!! And the design/aesthetic possibilities afforded by doing your own layup sound great as well! Weather or not it is practical is another matter entirely.

I don't believe that a fiber-reinforced plastic composite housing will stand up to the heat on its own. The cloth itself can likely take the heat, but the plastic resin will be the weak link. Epoxy is probably most common with carbon fiber (especially if you are doing your own layup) and while it won't "melt" due to heat, it may soften and it will at some point burn or otherwise turn into a charred mess. It will likely give off some nasty fumes during this process. If insulated/shielded adequately, carbon fiber would be fine; if you are insulating it that much, however, a lot of less costly materials would work, too...
Koffee Kosmo
I will take the comments expressed so far &
Make it from steel
Make it one of these two design styles -
1) Open drum with agitator or 2) Horizontal drum traditional

However it will need to have some sort of mechanical bean dump mechanism to a built in cooler

Bottom will stay the same as its designed to catch the chaff

Keep those ideas coming

KK
Edited by Koffee Kosmo on 04/18/2009 6:54 PM
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://forum.hom...ad_id=1142

https://docs.goog...lide=id.i0
Blog - http://koffeekosm...gspot.com/

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
seedlings
If you use a reversible motor, you can make an opening in the top to dump the beans in and as it rotates one way during roasting, the beans pour over the opening. When the roast is over, reverse the motor and the beans will be scooped out of the same opening.

I dunno?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
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