Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.

Shoutbox

You must login to post a message.

allenb

05/28/2023 6:19 PM

Laurierejoice

renatoa

05/22/2023 1:38 AM

Icebreak,

allenb

05/18/2023 8:23 AM

gvayll and TheGipsyRoaster

renatoa

05/18/2023 1:23 AM

Gavin and L_To

allenb

05/16/2023 11:49 AM

Wsunate, glad you found us! Post often and have fun!

Shoutbox Archive

Forum Threads

Newest Threads

Observations during 1C
Roast Color Meter
Freezing green beans
can't establish comm...
Bean roasting times ...

Hottest Threads

Larry Cotton's 'w...	[43]
2 series heat gun...	[23]
SR540 - Ideal pro...	[20]
New with Hottop r...	[19]
1kg (or 2 lb) flu...	[17]

In Memory Of Ginny

Donations

Latest Donations
dmccallum - 10.00
JackH - 25.00
snwcmpr - 10.00
Anonymous - 2.00
Anonymous - 5.00

Users Online

Guests Online: 3

Members Online: 0

Total Members: 7,868
Newest Member: Laurierejoice

Oh no! Where's the JavaScript?
Your Web browser does not have JavaScript enabled or does not support JavaScript. Please enable JavaScript on your Web browser to properly view this Web site,
or upgrade to a Web browser that does support JavaScript; Firefox, Safari, Opera, Chrome or a version of Internet Explorer newer then version 6.

View Thread

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

Who is here? 1 guest(s)

Motor shaft heat issues
JackH	#1 Posted on 06/20/2011 8:40 AM
Administrator Posts: 1809 Joined: May 10, 2011	Hello, I was wondering about how other turbo designs deal with the heat that gets transfered from the roasting chamber to the motor via the shaft. I have installed a heavy motor (AC Continuous duty with gearbox 16 rpm) that I think it was meant to be a rotisserie motor. It works very well but I do notice the motor shaft getting hot. The gearbox is not hot to touch. There is no mechanical binding of the shaft anywhere that I can see. I use a 1/4 inch square steel (keyway) shaft and 1/4 inch sockets to connect. I have the motor mounted in a heavy gauge aluminum chassis which should dissipate some heat. My thinking is that the motor should be able to take it since it was designed to be a rotisserie motor. There is a second motor shaft on the bottom (1/4 inch dia) that is meant to have a small fan blade mounted if necessary. I don't think it is really a problem. Just curious to see what others do about this. Thanks, --Jack ---Jack KKTO Roaster.


Dan	#2 Posted on 06/20/2011 9:04 AM
1 1/2 Pounder Posts: 1662 Joined: October 24, 2005	These little synchronous gearmotors get hot. Not the gearbox, but the motor itself, hence the little fan on some of them. Adding heat on both sides of the gearbox will reduce its life, but by how much I don't know. Mine has been going well for four years. I do oil the shafts on the gearbox and motor occasionally. I added a heat slinger of sorts between the drum and the gearbox. On the drum coupler I turned a small fin. And, I drilled a cross hole on the coupler, too, to help dissapate heat. You can see the fin in this photo, but the cross hole is not visible. Edited by Dan on 06/20/2011 9:05 AM
	Web

Koffee Kosmo	#3 Posted on 06/21/2011 3:31 AM
Administrator Posts: 1618 Joined: December 31, 2008	I use 3 inter related methods 1] Insulation shield between the roast chamber to the motor housing and minimal contact between the metal parts 2] Length of the shaft as a heat sink 3] A small contact point or coupling of the shaft to the motor 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

JackH	#4 Posted on 06/21/2011 6:14 PM
Administrator Posts: 1809 Joined: May 10, 2011	Dan and KK: Thanks for the information. I will see how it goes and check the motor/gearbox now and then. I did find a small fan blade with a 1/4 inch mount that I will add just in case.


Koffee Kosmo	#5 Posted on 06/22/2011 6:16 AM
Administrator Posts: 1618 Joined: December 31, 2008	My roaster section is separate to the motor section as in separate component modules So the motor is not directly bolted to the hot part of the roaster It keeps the motor cool to the touch and well within its limits 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

JackH	#6 Posted on 06/22/2011 11:43 AM
Administrator Posts: 1809 Joined: May 10, 2011	Quote Koffee Kosmo wrote: My roaster section is separate to the motor section as in separate component modules So the motor is not directly bolted to the hot part of the roaster It keeps the motor cool to the touch and well within its limits KK My Turbo Crazy now has a separate motor compartment too. I went with a stronger motor and had to build a small box underneath. By the way your idea of using springs on the stirring arms works great! Thanks!!


dja	#7 Posted on 06/22/2011 1:28 PM
1 1/2 Pounder Posts: 701 Joined: November 07, 2008	other then being a little on the slow side I wouldn't knock that motor in a stir crazy to much you really have to give it credit for what it is. The one in my roaster has been in there for over 5 years of spinning beans in all kinds of weather and all of the side trips into the world of home roasting coffee that I have put it through. And yep its still spinning beans and doing its little reversing act that it does. And the one that I had before this one is still alive and well in Tulsa where it has taken up residance with my brother roasting coffee for him. They should make them so that the turn about 10 rpm faster. DJA I pour Iron and roast Coffee Beans If life seems normal your not going fast enough Mario Andrette


JackH	#8 Posted on 06/22/2011 7:07 PM
Administrator Posts: 1809 Joined: May 10, 2011	The new motor runs at 16 rpm. faster than the original 10 rpm motor. Lots of power too. I had to keep reducing the bean load with the old motor to 300g to get it to stop reversing back and forth making "angel wings". Now I can easily do 1 pound which meets my needs.


Koffee Kosmo	#9 Posted on 06/22/2011 8:02 PM
Administrator Posts: 1618 Joined: December 31, 2008	Yes the spring mod is simple now but it took me a while to figure it all out B) Glad it worked for you as well 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

Jump to Forum:

Similar Threads

Thread	Forum	Replies	Last Post
2 series heat gun elements	Fluidbed Roaster	24	05/21/2023 2:06 AM
Larry Cotton's 'wobble disc' heat gun build	Heat Gun Roasting	44	05/13/2023 9:28 AM
No heat suddenly. Problem continues even with swapped heating element.	Gene Cafe Roaster	9	05/01/2023 7:13 PM
New TC4+ Popcorn Pumper issues	Building a Coffee Roaster	19	04/24/2023 9:30 AM
Is vacuum cleaner motor ok for fb roaster?	Fluidbed Roaster	35	04/17/2023 11:22 PM