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View Thread
Homeroasters.org » BUILDING A ROASTER » Drum Roasters
Who is here? 1 guest(s)
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2nd drum roaster
witoldb
I'm not happy with the results from my current roaster ("Drum roaster in glass tube" post).
Rosted beans look and smell good (roasting up to 2 to 3 minutes after 1st crack, total time around 15 minutes) but they have strange hint of chemicals smell, bit like solvent or paint brush cleaner.
Also I have to raise ET to 320 deg C to get down to around 15 minutes.
I think my problem is with most hot air bypassing the beans and flowing out through top of wire mesh drum.
Started today building solid drum.
Holes are 4 mm.
Wall is 1 mm thick and is from S/S water pump casing, end plate from 2 mm S/S plate.
witoldb attached the following images:
dsc01468.jpg dsc01467.jpg dsc01465.jpg dsc01463.jpg

Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
allenb
Nice work on the drum! How will you isolate air path to the rear of the drum only?

I think you're on the right path. Directing the convection air through the drum will allow a lower ET with less volatile loss and hopefully eliminate odd flavors.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
Wow. Really nice! You're a lot more ambitious with a drill press than I am. Grin
Can you give the dims on the drum? Looking forward to your progress reports, thanks for sharing.
Espresso: 'PID'd Olympia Cremina, Franke Ecolino
Grinder: Macap M4
Roaster: Old fire extinguisher with a crank, over a crab cooker.
 
witoldb
I'm thinking about conventional layout with heating elements under the drum and cyclone on the outlet.
Do you think that elements and exhaust fan (for cyclone) from small table top oven similar to photo below will be suitable?
Drilling finished.
Drum is bit short; 118 mm long by 123 mm ID, 1.4 liter volume.
Will try to extend it in the front with S/S sheet (have to finish spot welder first).
witoldb attached the following images:
table_oven.jpg dsc01476.jpg dsc01471.jpg

Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
witoldb
I made some progress.
Heating elements are 375 W each x 4 = 1500 W total power.
Got TC4C board and Samwon SM-490 PID controller (3 programs, each with 20 ramping segments).
Working now on bushings to mount the drum on the shaft.
Next will be mixing vanes.
I also made spot welder which I will use to make thermocouples and SS covers for the drum/insulation + to weld some sheeting to the front of drum to increase its length and volume to around 2 liters.
Do you know if glass from Petri dish will be suitable for wieving window and if it is possible to cut it with Dremmel tool?
witoldb attached the following images:
roaster1_1.jpg roaster2.jpg roaster3.jpg spotwelder.jpg

Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
yamhill
Nice progress on the roaster. Nice spot welder too. I don't know about the Petri dish, but you can find discussions here. Try searching for "sight glass".
Quest M3, IMEX digirosto 1500, various popcorn popper roasters, with TC4 logger, Quick Mill Vetrano, PIDed Rancilio Silvia espresso, Presso, Chemex, Hario, and Melitta drip, Cory and Yama vacuum/siphon, bodum french press, aeropress; Mazzer Major, Hario mini, and PeDe Dienes grinders - and a Nuova Simonelli Aurelia rebuilder in pieces
 
seedlings
Very nice progress! I'm contemplating a drum roaster project, and appreciate this project very much.

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

I made some progress.
Heating elements are 375 W each x 4 = 1500 W total power.
Got TC4C board and Samwon SM-490 PID controller (3 programs, each with 20 ramping segments).
Working now on bushings to mount the drum on the shaft.
Next will be mixing vanes.
I also made spot welder which I will use to make thermocouples and SS covers for the drum/insulation + to weld some sheeting to the front of drum to increase its length and volume to around 2 liters.
Do you know if glass from Petri dish will be suitable for wieving window and if it is possible to cut it with Dremmel tool?


This is turning into a very nice roaster. Curious about the disc on the front end of the roaster and how the dump door fit's into the design?

On the petri dish. cutting with a Dremel would most likely be a real challenge. Would need a wet diamond wheel from what I remember and even with this it would require precision to not chip or crack it. It's possible to use regular glass as long as you install it where it can move in all directions with out pinching. I would use three thin sheet metal tabs to provide spring-like tension against the glass from the inside.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Dan
A petri dish is probably borosilicate glass (aka Pyrex). I have some glass discs. They are about 2" in diameter and probably plain glass. I believe they were for flashlight lenses. Send me your address and I'll mail you some for free.
 
http://www.intactamerica.org
witoldb
Thank you for the offer but I'm from Dubai.
I will try tommorow to cut the petri dish.
Actually I have Proxxon mini drill wich has got much smaller run-out then Dremmel so hopefully it will work.
Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
witoldb
The disc in the front is a pot stand with silicone feet removed. It will be removable in case I will need to take out drum
for cleaning or modifications. Front and back plates are held in place by M4 studs and 1/4" spacer tubes.

I've cut the Petri dish and fabricated the door. View glass is approximately 50 x 30 mm. Final shape had to be done with sand paper.
It's separated from the frame by silicone gaskets.
witoldb attached the following images:
dsc01524.jpg dsc01528.jpg dsc01531.jpg dsc01532.jpg dsc01533.jpg dsc01538.jpg dsc01542.jpg dsc01543.jpg

Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
ginny
beautiful work you are doing. I appreciate your sharing this with all of us.

you cut the glass OK and it is in place?

ginny
What you're reading is my slow descent into insanity...
 
witoldb
The glass is installed but it didn't show in the photos.
Took some again to catch some reflection.
witoldb attached the following images:
dsc01545.jpg dsc01546.jpg

Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
witoldb
Made some progress with drum veins and trier.
Shape of veins attached directly to the drum is based on formula for helical strakes for stacks.
I will attach drum extension after cleaning the vanes from brazing flux.
witoldb attached the following images:
dsc01570.jpg dsc01565.jpg dsc01564.jpg dsc01563.jpg dsc01558.jpg dsc01556.jpg dsc01553.jpg dsc01551.jpg dsc01549.jpg

Edited by witoldb on 12/03/2012 13:30
Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
coffeeroastersclub
witoldb wrote:

I made some progress.
Heating elements are 375 W each x 4 = 1500 W total power.
Got TC4C board and Samwon SM-490 PID controller (3 programs, each with 20 ramping segments).
Working now on bushings to mount the drum on the shaft.
Next will be mixing vanes.
I also made spot welder which I will use to make thermocouples and SS covers for the drum/insulation + to weld some sheeting to the front of drum to increase its length and volume to around 2 liters.
Do you know if glass from Petri dish will be suitable for wieving window and if it is possible to cut it with Dremmel tool?


Is that a homemade spot welder?? If so, how did you put that together. Very curious.
"If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
 
http://www.coffeeroastersclub.com
witoldb
I've used 800 W transformer with 220/380 V primary and I think 2x 24V secondary windings.
Secondary winding is removed and replaced with 5.5 turns of 25 sq mm cable (maximum I could fit in available space).
Cable is soldered to copper flat bars (insulated from each other); top bar can pivot and has got handle with trigger switch.
Switch triggers SSR relay on primary side. SSR is DC input so I had to use small SMPS power supply.
I'm using 380 V winding as with 220 V power draw was too high - whole transformer was getting hot within 1 or 2 seconds.
Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
coffeeroastersclub
witoldb wrote:

I've used 800 W transformer with 220/380 V primary and I think 2x 24V secondary windings.
Secondary winding is removed and replaced with 5.5 turns of 25 sq mm cable (maximum I could fit in available space).
Cable is soldered to copper flat bars (insulated from each other); top bar can pivot and has got handle with trigger switch.
Switch triggers SSR relay on primary side. SSR is DC input so I had to use small SMPS power supply.
I'm using 380 V winding as with 220 V power draw was too high - whole transformer was getting hot within 1 or 2 seconds.


I use the typical jaw clamp one you can get from ebay for around $150. Been using it for years, runs on 110VAC. I love it, very handy tool. I think it is really cool that you made one. I love this kind of inventive stuff. ThumbsUp

Len
"If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
 
http://www.coffeeroastersclub.com
Coffeeluke
Was this ever finished? Would love to see some updates!
 
witoldb
Iíve got distracted by bargain espresso gear:
1. NS Oscar for $30; restored and modified + DIY thermofilter - details on HB forum
2. Faulty Saeco Incanto Digital for $60; repaired and sold with profit to finance used Elektra MXS grinder. I only had to install compression instead of push-in fitting in thermoblock as it kept blowing out after steaming.

In addition started Gaggia Classic mods (RTD/PT100 instead of temp. switches driving proportional regulator, timer to give 50% power to heating elements 4 seconds before pump starts and to maintain it during the shot). I will soon post the details on CG forum.

Hope to get back to the roaster soon.
Home: Breville DB, Mahlkonig Vario+K30
Work: Nuova Simonelli single group Aurelia I +MDX grinder
300g DIY drum roaster
 
tamarian
Hi Witold, just checked the HB thread, amazing stuff, but the roaster should come first ;-) Are you going to the SCAA training next month?
Wa'il. 1 Kg PID'ed gas-fired fluid bed roaster, GS/3MPS, K10F
 
http://english.varietalcafe.com
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