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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Turbo Oven Roasters

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First build failure..
jedovaty	#76 Posted on 02/18/2012 4:41 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Hi, everyone, all issues figured out :) My TO is too weak in the setup, dropping my batch size to 350g yields an even roast, let's me get straight through FC without stalling and without the need to break 475F. Now to figure out how to slow down the roast a little, the columbian is still kind of sharp and I think a slightly longer run to FC would be good. Thanks again for the help, this build is now a success! Edited by jedovaty on 02/18/2012 4:42 PM


jedovaty	#77 Posted on 02/25/2012 6:02 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Pictures of the stirring arms. I cut up the "tongs" that came with the TO set and then wedged them between stainless steel washers and jam nuts. Here's a link to a movie, dunno if my server can handle the load, if its slow be patient.. it does move the mass around, but the beans do flip. I'll try a red colored bean when I get a chance. http://jano.porta...ngarms.mov Edited by jedovaty on 02/25/2012 6:05 PM


Koffee Kosmo	#78 Posted on 02/26/2012 12:43 AM
Administrator Posts: 1620 Joined: December 31, 2008	That looks like a good agitation As noted - I also would like a red coloured bean or 2 to view the movement of the bean mass 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.
	Web

jedovaty	#79 Posted on 03/11/2012 5:42 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	I thought I had everything figured out but now I'm about to throw this POS into the trash. The last several roasts have been completely censored up, what's downright maddening is that I haven't changed a thing - the beans are the same, the temps are the same, only difference is position of the moon. Most recent roast, bean temps began to drop like a rock during first crack and I had to compensate by taking my env temps over 500F, which resulted in a horridly uneven roast that tastes like burnt rubber. With this goes my fun scheduled day of cupping with friends. Like the pirates say, aaarrrrrrggghhhh. :@ Is there a roaster for home that can safely do up to a pound without scorching the beans and allow me to control the speed? I give up. Waaay too much time and money wasted, time to stop fooling myself and realize I'm not a DIYer. Looks like I'm SOL, the quest, hottop, gene, and behmor don't fit the bill, batches are too small. The larger machines do too much (2kg is way more than I need), are far too large, and are too expensive at this time. Am I missing anything?


JackH	#80 Posted on 03/11/2012 6:21 PM
Administrator Posts: 1809 Joined: May 10, 2011	Any chance that you are on the same AC circuit as another appliance that may be bogging down the power at times? Probably best to have it on it's own circuit. You were doing well for a while, Something has changed. One thing I noticed with my turbo oven is that the fan motor bearings get gunked up by smoke/oil residue and the it takes quite a while to get to full speed. This is after over 8 months of roasting. You should check inside the turbo oven, I was surprised at the residue inside my oven blocking the vents etc. If the Turbo oven fan slows down, it will really effect the roast. Worth a check.


jedovaty	#81 Posted on 03/12/2012 9:33 AM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Jack - good point on the other appliances, I did make sure of that the last few times. Fan wearing down is certainly a plausible theory, that could explain why the BT goes down without a very strong ET, as well as the more uneven roasts. Would this also explain the inconsistent temps, where historically FC would occur between 392 and 400, and now all of a sudden it happens at 370 to 380? The only other explanation for this, I noticed my BT thermocouple has become quite a bit frayed, it's probably touching something metal. Hrrrm.


BenGeldreich	#82 Posted on 03/12/2012 2:25 PM
1/4 Pounder Posts: 76 Joined: January 20, 2011	Jano, Keep your head up!!! Coffee roasting isn't easy. I've failed more than I've succeeded. I've probably roasted 40 lbs of coffee and only 7 of the 40 were outstanding. 17.5 % success rate isn't something to write home about but the success out way the 33 lbs of mishaps or failed roasts. I know you were tinkering with running a Variac and am not sure how you are powering your TO. Can you fill us in on your current electrical setup. Ben -------- Ben Turbo Oven Roaster w/ Variac, TC4Cw/ Bourbon \| Bezzera Strega \| Baratza Vario Grinder \| Yama 5 Cup Syphon \| Aeropress
	Web

Lawnmowerman	#83 Posted on 03/15/2012 1:39 AM
Pounder Posts: 546 Joined: March 14, 2012	Has anyone besides me noticed what appear to be internal heat leaks in a turbo oven between the element and thermostat sections? I have a 1200 watt flavor wave that shines light from the element up thru the holes that the elements themselves are mounted on into the thermostat area! This can cause serious temp swings i think, and i will be plugging these when i install a bypass switch. Still working the roaster. Bad coffee prevails when good coffee roasters stand by and do nothing.


Koffee Kosmo	#84 Posted on 03/15/2012 7:53 AM
Administrator Posts: 1620 Joined: December 31, 2008	Quote Lawnmowerman wrote: Has anyone besides me noticed what appear to be internal heat leaks in a turbo oven between the element and thermostat sections? I have a 1200 watt flavor wave that shines light from the element up thru the holes that the elements themselves are mounted on into the thermostat area! This can cause serious temp swings i think, and i will be plugging these when i install a bypass switch. Still working the roaster. The design needs to be like this' as it draws in air for the fan to blow in to the chamber If there is no expelling and the chamber is sealed it will create pressure and it will blow Thats my take on it B) 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.
	Web

Lawnmowerman	#85 Posted on 03/15/2012 9:34 AM
Pounder Posts: 546 Joined: March 14, 2012	Air is drawn into the top section of the co thru a cencentric vent. And there is a vent on top. I thought co systems use forced air. What i am seeing appears to be a design flaw. The plate that the element mounts to has 3 die cut holes in it to accept clips that hold the element. These appear to be causing heat leaks out of the r c area. Bad coffee prevails when good coffee roasters stand by and do nothing.


BenGeldreich	#86 Posted on 03/15/2012 10:57 AM
1/4 Pounder Posts: 76 Joined: January 20, 2011	Quote Lawnmowerman wrote: Has anyone besides me noticed what appear to be internal heat leaks in a turbo oven between the element and thermostat sections? I have a 1200 watt flavor wave that shines light from the element up thru the holes that the elements themselves are mounted on into the thermostat area! This can cause serious temp swings i think, and i will be plugging these when i install a bypass switch. Still working the roaster. Does the flavor wave model use a light tube as a heating element? If so they have more than one design flaw! I could never get an even roast with my flavorwave it had hot spots and air wasn't flowing in a conventional manner. If you get a chance pick up a Galloping Gourmet or a model that doesn't use a light bulb as a heat source. You will notice the difference just by Turing the fan on. Look forward to seeing the roaster!! -------- Ben Turbo Oven Roaster w/ Variac, TC4Cw/ Bourbon \| Bezzera Strega \| Baratza Vario Grinder \| Yama 5 Cup Syphon \| Aeropress
	Web

jedovaty	#87 Posted on 03/15/2012 11:09 AM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Quote BenGeldreich wrote: I know you were tinkering with running a Variac and am not sure how you are powering your TO. Can you fill us in on your current electrical setup. Ben, here's what it looks like: AC -> TO's fan AC -> HF Router Speed Control HF Router Speed Control -> TO's heating element AC -> LCD power brick LCD Power brick -> 12V motor LCD Power brick -> 12V-5V car cigarette cell phone power adapter CCCPPA -> arduino AC comes from a 20A circuit, and all appliances are off. I measure draw of all items at max through a heavy duty power strip, and it was something like 12-13A. No extension cords used. All power cables support 15A. I'm really confused -- I was absolutely convinced last week the fan in the TO is to blame, but studying the past graphs, I'm not convinced as the ET continues to behave normally. My ET probe (*) sits just above the beans. The fact that ET is fine rules out the HF RSC item. Regardless, going to take apart the TO in a couple weeks and see if it needs a cleaning. If I don't find anything out of the ordinary, will try another roast, and if that fails, I'm going to junk the project and find something commercial. I just don't feel like tinkering with this stuff any longer. jano * -- ET Probe.. hahahahahhaha Edited by jedovaty on 03/15/2012 11:10 AM


Lawnmowerman	#88 Posted on 03/15/2012 1:08 PM
Pounder Posts: 546 Joined: March 14, 2012	Please dont junk your project. A lot of people are drooling over all that stainless steel. At least let us know if you do so someone can retrieve it. Have you even considered hgbm? Been using mine for almost a year and very pleased with it. You coulduse a heat gun with your roaster with a different lid. Bad coffee prevails when good coffee roasters stand by and do nothing.


jedovaty	#89 Posted on 03/26/2012 3:49 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Few new developments. Inspected my deni TO and can't tell if the fan is performing accurately without taking it apart. I did manage to use the kkto to evenly roast some organic almonds which were then pulverized into a most excellent butter, but that's for another forum. The past weekend I found an ad for one of the old 1470W galloping gourmets which I subsequently posted. Have to say, my first "weird" experience on craig's list. The guy was unbelievably desperate to sell the item, lied on multiple occasions, but fortunately, the thing works (albeit is gross and needs a major cleaning). He waited over an hour for me in a rainy parking, so I didn't have the heart to talk him down any lower than $20. Soon as I have some time, going to sanitize and modify the GG and give this a second go-round. Until then, kean and portola will have to do. Now to decide whether to go the SSR route or variac. The SSR is appealing as I'll be able to log in pCataui, however, I don't like the idea of having extra cables (one will have to connect the oven to the arduino). And the variac, well that thing's just a big ol' monster. I will also need to find a better way to get the bean temp, I think the frayed TC was causing some issues if pushed up against the colander.

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