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Gas grille coffee roaster
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tiopaeng |
Posted on 06/21/2013 3:18 AM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
I just converted my gas grille into a coffee roaster and installed a variable speed dc motor. Does speed matters when roasting? Thanks, Tiopaeng |
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Koffee Kosmo |
Posted on 06/21/2013 4:40 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote tiopaeng wrote: I just converted my gas grille into a coffee roaster and installed a variable speed dc motor. Does speed matters when roasting? Thanks, Tiopaeng Yes it does To slow and the beans burn from contact To fast and the beans are flying in the air You want a happy medium Depending on the drum size and set up aim for 45 rpm to 55 rpm KK I home roast and I like it. Designer of the KKTO
Roaster Build information https://homeroast...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. |
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tiopaeng |
Posted on 06/21/2013 2:08 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
I tried roasting at 120 rpm and it gave me a very consistent roast. To be honest the result was better than the 50 rpm roast I had with a roast time of 13 mins@ 500f . Thanks for your reply Tiopaeng |
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snwcmpr |
Posted on 06/21/2013 4:31 PM
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1 1/2 Pounder Posts: 925 Joined: March 03, 2011 |
How big of a diameter did you have? Ken in NC --------------
Backwoods Roaster "I wish I could taste as well as I wish I could roast." As Abraham Lincoln said "Do not trust everything you read on the internet". |
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coffeeroastersclub |
Posted on 06/21/2013 4:43 PM
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Pounder Posts: 535 Joined: May 26, 2009 |
Quote tiopaeng wrote: I tried roasting at 120 rpm and it gave me a very consistent roast. To be honest the result was better than the 50 rpm roast I had with a roast time of 13 mins@ 500f . Thanks for your reply Tiopaeng While it may work fine with lighter roasts, you may find the excessively high RPM detrimental to darker roasts in that the high speed with actually "grind" a vienna, french roast, and italian roast. A better term yet is "smash apart" the more delicate darker roasted bean. Len "If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
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rustic_roaster |
Posted on 06/21/2013 5:51 PM
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1/4 Pounder Posts: 109 Joined: March 30, 2013 |
Quote coffeeroastersclub wrote: Quote tiopaeng wrote: I tried roasting at 120 rpm and it gave me a very consistent roast. To be honest the result was better than the 50 rpm roast I had with a roast time of 13 mins@ 500f . Thanks for your reply Tiopaeng While it may work fine with lighter roasts, you may find the excessively high RPM detrimental to darker roasts in that the high speed with actually "grind" a vienna, french roast, and italian roast. A better term yet is "smash apart" the more delicate darker roasted bean. Len For those delicate darker roasts I was thinking just go even faster and you dont have to worry about them banging around. (joke) I know over a certain speed the bean will be pushed to the drum, Is there a rule of thumb for how far from the top of the drum arc the bean should fall? |
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coffeeroastersclub |
Posted on 06/21/2013 7:31 PM
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Pounder Posts: 535 Joined: May 26, 2009 |
Quote rustic_roaster wrote: Quote coffeeroastersclub wrote: Quote tiopaeng wrote: I tried roasting at 120 rpm and it gave me a very consistent roast. To be honest the result was better than the 50 rpm roast I had with a roast time of 13 mins@ 500f . Thanks for your reply Tiopaeng While it may work fine with lighter roasts, you may find the excessively high RPM detrimental to darker roasts in that the high speed with actually "grind" a vienna, french roast, and italian roast. A better term yet is "smash apart" the more delicate darker roasted bean. Len For those delicate darker roasts I was thinking just go even faster and you dont have to worry about them banging around. (joke) I know over a certain speed the bean will be pushed to the drum, Is there a rule of thumb for how far from the top of the drum arc the bean should fall? 60 RPM is optimum for drum roasting, I think that has been set in stone for quite some time. AFAIK the majority of commercial drum roasters rotate at that speed, and most smaller ones do too. Len "If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
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tiopaeng |
Posted on 06/21/2013 8:31 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
The diameter is 0.346 x 0.530 it's quite big compared to my other roast. Also I would say this a Vienna light roast. I like to post a picture but I don't know how! Thanks Tiopaeng |
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Koffee Kosmo |
Posted on 06/22/2013 8:28 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote tiopaeng wrote: I tried roasting at 120 rpm and it gave me a very consistent roast. To be honest the result was better than the 50 rpm roast I had with a roast time of 13 mins@ 500f . Thanks for your reply Tiopaeng Is that the rated speed of your motor ? If so thats the free wheeling without load specs, As one puts load on a motor it's speed reduces KK I home roast and I like it. Designer of the KKTO
Roaster Build information https://homeroast...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. |
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tiopaeng |
Posted on 06/22/2013 10:26 AM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
Yes it's 120 rpm w/out load. Is the bean diameter good? Thanks |
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tiopaeng |
Posted on 06/22/2013 6:28 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
Today's Roast Full City+ at 50RPM.
tiopaeng attached the following image:
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coffeeroastersclub |
Posted on 06/22/2013 6:54 PM
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Pounder Posts: 535 Joined: May 26, 2009 |
Quote From picture looks more like a City to City+ to me, but outside of that a very even roast. Good RPM, I'd stick with that to 60RPM. Len "If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
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tiopaeng |
Posted on 06/23/2013 7:44 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
Pictures of my 2lb Roaster: Fully automated w/PLC control and HMI PID Control, SSR for heating w/2 thermocouples Profile Recipe up to 5 Segments, Temperature and Time Run in Manual when profiling, Automatic to run recipe Variable speed DC Drum motor (very quiet) -------- Things TO DO: 1. Be able to take samples between roast 2. Improve lighting inside 3. Install TC probe inside drum 4. Insulate top cover from inside (lot of heat loss here) 5. Install vent pipe (exhaust smoke) I Appreciate everybody's comments and suggestions.. Thank You, Tiopaeng
tiopaeng attached the following images:
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coffeeroastersclub |
Posted on 06/23/2013 9:14 PM
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Pounder Posts: 535 Joined: May 26, 2009 |
Quote tiopaeng wrote: Pictures of my 2lb Roaster: Fully automated w/PLC control and HMI PID Control, SSR for heating w/2 thermocouples Profile Recipe up to 5 Segments, Temperature and Time Run in Manual when profiling, Automatic to run recipe Variable speed DC Drum motor (very quiet) -------- Things TO DO: 1. Be able to take samples between roast 2. Improve lighting inside 3. Install TC probe inside drum 4. Insulate top cover from inside (lot of heat loss here) 5. Install vent pipe (exhaust smoke) I Appreciate everybody's comments and suggestions.. Thank You, Tiopaeng Very impressive setup. That is the most I have ever seen anyone do with a grill setup. The drum looks a bit familiar ... Len "If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln
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tiopaeng |
Posted on 06/25/2013 2:28 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
That's rk drum. Thanks |
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tamarian |
Posted on 07/02/2013 8:41 AM
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1/2 Pounder Posts: 320 Joined: January 21, 2012 |
Very impressive! WOuld love to hear more about the PLC and how you are using it. I can see PLC in a future upgrade for myself. Does it control the gas/propane? Wa'il. 1 Kg PID'ed gas-fired fluid bed roaster, GS/3MPS, K10F
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Dan |
Posted on 07/02/2013 9:38 AM
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1 1/2 Pounder Posts: 1662 Joined: October 24, 2005 |
PLCs are great for controlling machines. Even a small one gives you 12 inputs and outputs. I have four machines at work that I designed and built that have PLCs. The problem is that, as far as I know, there's no PID code to insert in th PLC's ladder logit, so you have the added extra cost and complexity of a PID running off to the side. Most PLCs have the option of a touch screen for monitoring and minor input. I think a PLC is overkill for a home roaster since a likely scenario uses just 3 inputs and outputs.
1 pound electric sample roaster, 3 pound direct-flame roaster, both handmade; modified Mazzer Mini grinder, LaSpaziale Vivaldi II automatic espresso machine. When the electricity goes out I make vacpot coffee from beans ground on my Zassenhaus hand grinder, and heat the water with a teakettle on the gas range.
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tiopaeng |
Posted on 07/02/2013 4:43 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
Quote Hello Tamarian, Dan is right, PLC's are overkill specially on a modified grille roaster. I just happen to have some old plc and parts lying around so it did not cost me anything for the automation. Yes it controls everything in "Automatic Mode" including the heating gas valve, igniter, Drum and Cooling Fan. Heating is controlled by PID. It's nice to just seat back and watch your roast repeat the profile and get the same results and consistency everytime. Thanks for asking... |
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tamarian |
Posted on 07/02/2013 5:11 PM
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1/2 Pounder Posts: 320 Joined: January 21, 2012 |
Quote Yes it controls everything in "Automatic Mode" including the heating gas valve, igniter, Drum and Cooling Fan. Heating is controlled by PID.. I'd like to know the valve used and how the PID controls it. Is it via voltage or current? I'm working on converting my PID'ed electric fluid bed roaster into gas, using a Fuji PXG4 and a Clippard electronic modular valve. A couple of others here are working on similar setups, and what be great to see details of a working solution for automated gas control! Wa'il. 1 Kg PID'ed gas-fired fluid bed roaster, GS/3MPS, K10F
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tiopaeng |
Posted on 07/02/2013 9:20 PM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
If you want your control to be proportional ( voltage or current ) then your headed the right way. It's going to be a little bit expensive. Or you can do it the poor man's way - control by Solid State Relay ( ON/OFF ). You can achieved the same result. I'm using an ASCO gas valve, around $35.00. |
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butch burton |
Posted on 08/22/2013 10:52 PM
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Newbie Posts: 9 Joined: August 17, 2013 |
If the speed is too fast - beans don't move because centrifugal force makes them stick to the side of the drum and then u get burnt and green beans. A factor is the diameter of the drum - a small drum diameter beans slower rpm. Another factor is the mass of the drum. Intelligentsia Coffee uses old German Hothow roasters cause they have cast iron drums. I used 12 gauge cold rolled steel in mine. Hot rolled rusts and flakes off almost immediately. My roaster is 10" in diameter and 23" long and has a theoretical capacity of 5 or 10# depending on whom u believe. Mass is important because when you dump cold beans into the drum, it really lowers the temp. Many people use thin stainless steel trash cans and get good results. Drilling SS is a PITA. My gearmotor is a maxitorque and runs at 30 RPM. Got it from surplus center for $30. Once the word got out - they were out of them and if you pay full price, it is around $200. Other Equipment Large Bunn commercial grinder - got 2 of them for $100. Have a bunch of press pots, several vac pots - fun to watch the water go up and down. One is absolutely huge. Use a Bunn most of the time. Have a large dual wheel Enterprise coffee grinder - gift from a friend - pita to move - weighs over 150# It looks really cool with the hopper on top which will hold at least 10# beans. That and an ancient duck press will look great in my new kitchen. |
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tiopaeng |
Posted on 08/23/2013 2:54 AM
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1/4 Pounder Posts: 50 Joined: June 19, 2013 |
I have installed a variable speed DC gear motor and it's super quiet. I can now adjust the RPM. That's good information about the Cold rolled and Hot rolled steel. thanks for the info and welcome to HRO Tiopaeng |
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