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

Who is here? 1 guest(s)

Having problems....
HerbTokyo	#1 Posted on 03/02/2012 12:48 PM
Newbie Posts: 12 Joined: December 13, 2011	I have been pouring over these posts for 6 months... I have built and rebuilt and on and on... I used a sewing machine motor the first time, got the whole thing put together...fired the first roast, at about first crack, lots of smoke was pouring out and having roasted in a few other machines I'd built... I knew something was wrong. I fried the motor(I'll add that I used a bearing coupled to the driveshaft and believe this was the reason), so I took it all apart, bought a new motor (Dayton 3000 rpm 1/60 hp)...once again got it all put together and it wouldn't spin the beans...ended up frying it.... Another new motor, this time 1/3 hp 1000 rpm big dog motor(this time I'd used a bronze bushing similar to what others had used), fried it.... Last week I picked up a 1/2 hp 3,700 rpm motor and ordered a 1/2 inch SS driveshaft with a spider coupler to couple to 1/2 motor shaft.. I plan to hook it up today, but I am so afraid of frying the motor that I have to post and see if anyone has any idea what I am doing wrong... Any help would be greatly appreciated as I am buying a load of beans next week and My ex kept my popper when we split...really sick of oven roast coffee.


HerbTokyo	#2 Posted on 03/02/2012 12:52 PM
Newbie Posts: 12 Joined: December 13, 2011	I also can't get my pictures small enough to post


JETROASTER	#3 Posted on 03/02/2012 1:09 PM
Administrator Posts: 1780 Joined: March 06, 2010	You can reduce them in something as simple as 'paint'. ...Or take a quick shot with a smart-phone and edit with 'pic-say pro' Then check the file name. Make sure there are no spaces. Good luck! -Scott


jedovaty	#4 Posted on 03/02/2012 1:09 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	How are you powering the motor? Have you tried doing a dry run before assembling everything? I use a windshield wiper motor from the junk yard, and power it with an amazon 12V LCD power supply (6A).


HerbTokyo	#5 Posted on 03/02/2012 1:54 PM
Newbie Posts: 12 Joined: December 13, 2011	I am using an extension cord, that i stripped...ground, + and -


HerbTokyo	#6 Posted on 03/02/2012 1:55 PM
Newbie Posts: 12 Joined: December 13, 2011	dry run...yes...it powers and spins @ chris moneymaker (i think hehe) I've tried paint...cant get it small enough, my droid blacked out a few weeks ago I have a few car window motors, but I am pretty dead set on Farmroasts high speed beanbat concept...my agitator is a thin gauge SS wire much like his, with the last motor... it actually was working during the roast and spinning the beans around the pot, but I had to hand crank it to get it going...then it would spin the beans for a few minutes before losing the torque required...then I hand crank again.... crazy how a window motor has the power to push the beans, but somehow these heavy duty motors I am using crap out.... Thanks for the speedy responses dudes! Edited by HerbTokyo on 03/02/2012 2:04 PM


HerbTokyo	#7 Posted on 03/02/2012 2:06 PM
Newbie Posts: 12 Joined: December 13, 2011	Does it maybe have something to do with the extension cord? Do you think I am losing power through this? My variable speed is a 6 amp dimmer switch HerbTokyo attached the following image: Edited by HerbTokyo on 03/02/2012 2:19 PM


HerbTokyo	#8 Posted on 03/02/2012 2:20 PM
Newbie Posts: 12 Joined: December 13, 2011	heavy duty motor HerbTokyo attached the following image:


HerbTokyo	#9 Posted on 03/02/2012 2:20 PM
Newbie Posts: 12 Joined: December 13, 2011	driveshaft and spider coupler HerbTokyo attached the following image:


JackH	#10 Posted on 03/02/2012 5:38 PM
Administrator Posts: 1809 Joined: May 10, 2011	I think Ed used the sewing machine motor as a replacement for the turbo oven's fan motor. For the roaster stirrer, he used a 25W variable speed gear head motor.


HerbTokyo	#11 Posted on 03/02/2012 5:44 PM
Newbie Posts: 12 Joined: December 13, 2011	Tested extension cord to dimmer to motor.... it spins motor at different speeds!! very happy about that.... gonna put it all together soon and update yall... I see lots of people checking this thread and I'm pleased...feel like their's some good energy around here and I need it:) I can't wait! I've observed some very helpful cats in this forum dedicated to helping folks get their machines roastin the beans and want to thank everyone!! Yall might not know me, but I know you! hehe...I mean that in the least creepy way possible...promise:)


HerbTokyo	#12 Posted on 03/02/2012 5:48 PM
Newbie Posts: 12 Joined: December 13, 2011	@JackH ... Wow for real? Thought the sewing machine motor spun the beans... oops, oh well... I'm in deep already and I'm usin what I got, hope it works! Thanks for the reply buddy!


JackH	#13 Posted on 03/02/2012 5:58 PM
Administrator Posts: 1809 Joined: May 10, 2011	Here is a motor that looks like the same one he used. Kind of pricey $55. Not sure if it is the exact type but it may give you some ideas. http://ntsurplus....uct_id=103 I think the roaster heat transfered thru the drive shaft to the motor might be an issue for some motors. These gear head motors can take it.


JackH	#14 Posted on 03/02/2012 6:06 PM
Administrator Posts: 1809 Joined: May 10, 2011	Quote HerbTokyo wrote: Tested extension cord to dimmer to motor.... it spins motor at different speeds!! very happy about that.... gonna put it all together soon and update yall... I see lots of people checking this thread and I'm pleased...feel like their's some good energy around here and I need it:) I can't wait! I've observed some very helpful cats in this forum dedicated to helping folks get their machines roastin the beans and want to thank everyone!! Yall might not know me, but I know you! hehe...I mean that in the least creepy way possible...promise:) Give it try! It looks like a strong motor and that coupler should help keep the motor from getting too hot. I think you can get insulating spiders for the coupler that are high temperature.


jedovaty	#15 Posted on 03/02/2012 6:33 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	Jack -- is that motor you linked to an AC motor -- it says 100V so I'm confused. What is a "Fuji Machine" ?


JackH	#16 Posted on 03/02/2012 8:03 PM
Administrator Posts: 1809 Joined: May 10, 2011	Quote jedovaty wrote: Jack -- is that motor you linked to an AC motor -- it says 100V so I'm confused. What is a "Fuji Machine" ? Yes, you are right. Probably not the same model. There is another on Ebay but it is the motor only with no gear box. Looks just like Ed's in his Dreamroast posts. Oriental Motors is the company. Can't quite make out the numbers on Ed's photos. I think the Fuji machine it was pulled from might be a Fuji Frontier, a photo processing/printing system.


allenb	#17 Posted on 03/02/2012 8:13 PM
Administrator Posts: 3684 Joined: February 23, 2010	Quote HerbTokyo wrote: I picked up a 1/2 hp 3,700 rpm motor and ordered a 1/2 inch SS driveshaft with a spider coupler to couple to 1/2 motor shaft.. I plan to hook it up today, but I am so afraid of frying the motor that I have to post and see if anyone has any idea what I am doing wrong... Any help would be greatly appreciated as I am buying a load of beans next week and My ex kept my popper when we split...really sick of oven roast coffee. A few questions: What kind of motor is this 1/2 hp 3700 rpm model? AC 120 volt or DC permanent magnet. What is the max rpm you'll be running it? I'm assuming since it's direct coupled with no reduction you're running it less than 500 rpm. Also, shoot us some specs on the type of dimmer you're using to reduce the speed. With this information I think we can more intelligently determine if the marriage will be successful or not. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


Koffee Kosmo	#18 Posted on 03/02/2012 10:49 PM
Administrator Posts: 1618 Joined: December 31, 2008	I believe that Ed (farmroast) is using the bread maker frame and motor unit The roaster sits on top if the frame and the motor is utilized for agitation He also uses 2 heat sources The Turbo oven from the top & a cut down electric skillet from underneath Also a chaff collector mounted outside OK now to your problems You need a motor with high torque and a high load per sq centimeter And a speed that is suitable to your needs This may be silly but I have seen it happen If the motor is rated @ 24V and you are running it with a 12V power supply it will run at half speed A dimmer may also be the cause of intermittent problems These motors run best at full running speeds If you want to have a faster mixing action, just add another agitator arm KK Edited by Koffee Kosmo on 03/02/2012 10:50 PM 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

HerbTokyo	#19 Posted on 03/05/2012 12:55 PM
Newbie Posts: 12 Joined: December 13, 2011	Sorry guys, been busy. Thanks for the responses...the motor is a 115/230 volt...3400 max rpm...7.6/3.8 amp motor .... the dimmer is 5 amp 120 VAC, I haven't put it all together yet, but I have motor, dimmer and extension cord hooked up and everything seems to be ideal when it runs.... whether it has the torque required....yet to be determined. I also have a conduction heat source that I didn't put in the pictures, but all situated. It sounds like from the specs that my motor will be running at 1/2 power huh? 115 volts?


jedovaty	#20 Posted on 03/05/2012 1:03 PM
1/2 Pounder Posts: 225 Joined: October 31, 2011	I'm no expert in this - but maybe it's your dimmer? Perhaps a better way would be to attach a rheostat through a SSR? (bet it sounds like I know what I'm talking about... okay, back to my corner)


allenb	#21 Posted on 03/05/2012 4:33 PM
Administrator Posts: 3684 Joined: February 23, 2010	Quote HerbTokyo wrote: Sorry guys, been busy. Thanks for the responses...the motor is a 115/230 volt...3400 max rpm...7.6/3.8 amp motor .... the dimmer is 5 amp 120 VAC, I haven't put it all together yet, but I have motor, dimmer and extension cord hooked up and everything seems to be ideal when it runs.... whether it has the torque required....yet to be determined. I also have a conduction heat source that I didn't put in the pictures, but all situated. It sounds like from the specs that my motor will be running at 1/2 power huh? 115 volts? If your motor is an induction motor I would highly recommend not trying to use a dimmer. The last time (and only time) I tried this it was an immediate poof. Even if you get the pair to work it will be short lived. There's not many options for varying the speed of induction motors. Another thing to avoid is running a motor far slower than design under anything more than a light load to avoid overheating. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


farmroast	#22 Posted on 03/05/2012 5:22 PM
1/2 Pounder Posts: 295 Joined: December 20, 2006	I use commercial gearhead "speed control" motors made by Oriental motor co. Consists of motor, gearhead, control box and rheostat. Sell retail for about $280. a set but sets can be put together off ebay of NOS or like new for about $60.-$80. This way you don't lose as much torque when adjusting speeds. And they are well built. Induction motors won't work. I have some extra sets if interested Edited by farmroast on 03/05/2012 5:28 PM Ed B. DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/


HerbTokyo	#23 Posted on 03/05/2012 8:17 PM
Newbie Posts: 12 Joined: December 13, 2011	Thanks again for the responses...yall are so helpful. Would a permanent split capacitor, Condenser Fan Motor work? it is 1/3 hp, 2.1 amp, 1075 rpm Edit...that motor is fried....nevermind I do have very much interest in that Ed.. I'll have to wait for my tax dough to show though, so (I read too much Dr. Suess as a kid:) I'll let you know when it shows.... Edited by HerbTokyo on 03/05/2012 9:09 PM

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