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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Drum Roasters

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Page 2 of 3: 123

2nd drum roaster
witoldb	#26 Posted on 05/02/2014 12:44 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I made some progress on cyclone and exhaust fan casing. witoldb attached the following images: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


allenb	#27 Posted on 05/03/2014 9:15 PM
Administrator Posts: 3650 Joined: February 23, 2010	This is turning into the DeLorean of drum roasters and is quite a masterpiece! I agree with Russ that the pulley should not overheat at all and will sink away most of the heat picked up from the shaft. Love the brass bodied blower in your last post. I'd like to have one like that just to display on a shelf! Thanks for the detailed photos and hope you're planning on a nice video of the roaster browning some beans. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


witoldb	#28 Posted on 05/13/2014 12:23 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Cyclone completed and tested - I was surprised how well it works, Bill Pentz design is brilliant. Fan cannot be heard when room AC is working. I fed it with bread crumbs and dry Bougainvillea leaves cut to small pieces. Everything ends up in the jar and I can't see anything in the outlet duct, not even smallest bread crumbs dust. witoldb attached the following images: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#29 Posted on 05/13/2014 12:34 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Fan assembly/cyclone outlet details. Gasket between impeller casing and aluminium cover plate is from silicone baking sheet. Gap between impeller casing and cyclone cylindrical portion sealed with o-ring. I need to make some brackets to bolt down fan assembly into cyclone body and to compress the o-ring. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


Avyossii	#30 Posted on 06/01/2014 8:47 AM
Newbie Posts: 13 Joined: April 21, 2014	Hello Can you expand on the measures of the cyclone? I'm building my own coffee roaster and I'm now in the phase of the filter element... Thank you Yossi


witoldb	#31 Posted on 06/01/2014 2:38 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I've used Bill Pentz worksheet and entered following dimensions: ducting size DS = 38 mm (I made it similar to impeller inlet size) Impeller type IT = 0 motor size MS = 0 lid thickness WT =1 mm fixed cyclone diameter D Fixed = 92 mm fixed inlet width IW Fixed = 0 (Auto calc) fixed inlet height IH Fixed = 0 (Auto calc) cone length ratio CLK = 1.64 tab overlap TW = 8 mm After entering these, you will get all dimensions for cutting. I made cross sectional area of the fan casing outlet similar to cross section of 38 dia ducting. Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#32 Posted on 06/01/2014 2:52 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I'm busy drilling SS sheet for cooling tray. Plate is 3 mm thick, 220 x 220 mm, holes 3.5 mm dia in 5 mm triangular pitch. There are approx. 1600 holes. I'm using special drill bits for SS, slow rpm's and cutting oil, so far used 3 bits for around 60% holes. witoldb attached the following image: Edited by witoldb on 06/01/2014 2:57 PM Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#33 Posted on 09/29/2014 2:56 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Completed cooling tray. Minature ball bearing (ID=3 mm) in the middle acts as a support for mixer shaft. witoldb attached the following images: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#34 Posted on 09/29/2014 2:59 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Roaster, cooling tray and exhaust ducting. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#35 Posted on 09/29/2014 3:02 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I had to drill drum pulley and install small fan as belt was getting bit warm. Fan also cools SSR heatsink. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#36 Posted on 09/29/2014 3:06 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Full setup with extraction hood, fan speed is adjustable with a dimmer. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#37 Posted on 09/29/2014 3:11 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Control box with PID controller, TC4C, SSR with 4-20 mA input, stepper motor driver and 3 small SSR's for switching on cyclone, tray cooling fan and tray mixer motor. Drum RPM is adjustable with a pot. witoldb attached the following images: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#38 Posted on 09/29/2014 3:17 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I made SSR with 4-20 mA input to have better heater control. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#39 Posted on 09/29/2014 3:37 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	I roasted up to 600 grams and maximum current signal from PID was around 17 mA with 1500 W heating elements. Attached is log for 550 grams Mysoore Nuggets EB. Please let me know what adjustment would you recommend in this profile - I can enter up to 60 segments in my PID. My ET probe is at the back of the drum but I'm thinking to use it as inlet temperature and install 2 more probes for ET and MET on the front plate. I think that ET probe in the front will be better as it will take into account heat generated during 1C. What will be the best locations? I have space above trier and inside the chute below hopper dump valve. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


MikeW	#40 Posted on 09/29/2014 4:47 PM
1/4 Pounder Posts: 50 Joined: April 14, 2012	Nice work! Remember that the term "MET" means maximum environment temperature and refers to a "not to exceed" temperature for the air inside the drum. See: http://www.sweetm...staub.html From what I've read there's no right way to roast. But, it's common for people to try to hit a BT of 150*C around a range of 4 to 5 minutes from the time the beans are introduced into the drum. If you haven't already take a look at Scott Rao's book / web site for some good basic guidelines on roasting. Also look at allenb's and Ringo's past posts on roasting here at HRO. They contain excellent guidance.


Omega	#41 Posted on 09/29/2014 6:38 PM
1/4 Pounder Posts: 132 Joined: June 13, 2014	Wow! What a project! It takes real commitment and vision to accomplish what you have on this roaster. I'm astounded and very impressed! Barry


witoldb	#42 Posted on 09/30/2014 2:18 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	ET probe installed in the outlet chute. It is 1.45 mm dia ungrounded K thermocouple. witoldb attached the following images: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#43 Posted on 10/02/2014 4:26 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Roasted 575 grams Mysoore Nuggets with probe in outlet chute and connected to TC4 as ET and to PID as PV input. Inlet data is temperature before inlet to the drum. I think that I need to reduce load size or preheat to higher temperature. During first 10 min heaters could not deliver enough heat to reach temperature as per SV settings (current to heaters was at maximum). witoldb attached the following images: Edited by witoldb on 10/02/2014 4:33 PM Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


allenb	#44 Posted on 10/02/2014 10:01 PM
Administrator Posts: 3650 Joined: February 23, 2010	1500 watts can roast 1 lb in a drum roaster but leaves no headroom. 2kw is recommended to be able to make tighter turns. Is the pan that houses your tubular elements double wall or insulated? If not, you will have quite a bit of BTU loss through the pan's bottom and side walls. Another factor with tubulars is distance between them and the drum. Closer the better. I would try a 350 gram batch and see if this improves your rate of rise capability. Great looking roaster! Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


witoldb	#45 Posted on 10/03/2014 2:55 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Housing of the heaters is insulated with mineral fire blanket. Also drum cover is double wall with fire blanket in between. Distance of heating elements from the drum is approx. 50 mm. I've dropped the load to 350g and RoR has improved. Time till end of 1C got shortened from 16 min for 575g load to 11 minutes for 350g (chart in the background). witoldb attached the following image: Edited by witoldb on 10/03/2014 3:05 PM Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


witoldb	#46 Posted on 10/03/2014 3:03 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Seeing results for 350g, I've tried 453g and it looks like this will be a limit for my machine. I will try to add few hundred watts heating element to the back wall (if I can find suitable one) to improve temperature control. witoldb attached the following image: Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


JackH	#47 Posted on 10/04/2014 11:13 AM
Administrator Posts: 1809 Joined: May 10, 2011	What I see in your charts is that the ET is dropping during your charge/bean load (as it should) but is taking too long to get back up to roasting level. Your turning point on the BT is good but rises slowly. Both should be recovering quicker. What is controlling the heat in your roaster and are you sure full power is applied when it needs it (after the charge)? My roaster is also electric using a turbo oven top of about 1200 watts. I have to remove the entire top to load beans and it seems to recover quickly. My heater control is manual (variac), so I apply full power after the lid is opened and closed and the beans loaded. I have attached a roast I did yesterday of 560g. My problem is things are going too fast and I have to increase my load to 600-700g. You have very nice roaster build! I wish I could fabricate metal like that. JackH attached the following image: ---Jack KKTO Roaster.


witoldb	#48 Posted on 10/04/2014 12:55 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	Thanks for the pointers. My heat is controlled through PID with 4-20 mA and PWM SSR. I'm raising SV to 230 deg C immediately after charging the beans. Power is at its full as I can see PID output - it is giving full 20 mA to SSR. Looks like there is not enough power as PV lags behind SV untill reaching around 190 deg C/ 1C so additional heating elements may be needed. I will try to roast with partially open hopper chute to decrease air flow and see what happens. Edited by witoldb on 10/04/2014 1:00 PM Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster


allenb	#49 Posted on 10/04/2014 2:23 PM
Administrator Posts: 3650 Joined: February 23, 2010	Quote Power is at its full as I can see PID output - it is giving full 20 mA to SSR. Looks like there is not enough power as PV lags behind SV untill reaching around 190 deg C/ 1C so additional heating elements may be needed. It's interesting that your PID controller is at full power all the way until reaching setpoint value. Every PID controller I've used unless the control mode was wet to on/off mode with no PID would necessarily start backing off on the output well before reaching SV to avoid overshoot. Are you certain that it maintains full 20 mA output up to reaching setpoint? I've never found any value in running a controller using PID unless I was using it in ramp/soak mode due to the normal effects of proportional gain lessening output when nearing SV. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


witoldb	#50 Posted on 10/04/2014 5:08 PM
1/4 Pounder Posts: 72 Joined: May 07, 2012	PID is working and 20 mA starts gradually reducing before PV reaches SV. Refering to chart in post No 46, SV was set to 230 deg after charge and reduced to 210 at 9 min. (BT=180 deg) to extend 1C. After charging, PV dropped to around 160 deg at 1 min. (70 deg deltaT from SV) thats why initially signal was at 20 mA. Home: Breville DB, Mahlkonig Vario+K30 Work: Nuova Simonelli single group Aurelia I +MDX grinder 300g DIY drum roaster

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