Rotisserie roasting (electric oven)

[JavaB]

Re: Rotisserie roasting (electric oven)

UPDATE: after opening up the hood AGAIN....which was a PITA to put back on....AGAIN...it seems I only need to change the wiring around....but the wires are welded to the elements themselves, as are the elements themselves....i.e. top 2 elements are connected in series with each other as are the bottom elements.

Does anybody now what kind of welding is used on these elements? Should I take it to a general appliance place to get them to change the wiring around and weld the wires back? I am more than

Assuming they are different power ratings....

The elements are designed to be in series the way they are -well you could swap them both over - the two top ones with the two bottom ones - but you cant split them as they are probably 110/120 volt elements and they must remain a matched pair or one will be say 80 volts (fine) whilst the other would take 160 volts (burn out real quick!!!!)

And if you try to connect all 4 straight to 240V.... you will have a real BIG bang....

And solder wont cut it thats for sure.... the wires need to be welded with a spot welder. Remember these are "disposable" appliances - not designed to be fixed (or altered!!!!)

Final word of advice..... dont play inside unless you are qualified to do so.... you can easily cause a fire (bad enough) but there is the real possibility of death to you or someone who touches the oven...... You may feel confident to "fiddle" but you could easily bypass some safety device which will render the appliance dangerous.

Resist the temptation to fiddle with 240 volt appliances - especially high powered ones..... its not worth the risk!

There is no coffee in a coffin

[Wushoes]

Re: Rotisserie roasting (electric oven)

Thanks for the info guys...I just ordered a starter pack of green beans...all I need now is a proper drum =]

Im thinking about swapping the elements over as the bottom elements seem weaker than the top.

UPDATE: after opening up the hood AGAIN....which was a PITA to put back on....AGAIN...it seems I only need to change the wiring around....but the wires are welded to the elements themselves, as are the elements themselves....i.e. top 2 elements are connected in series with each other as are the bottom elements.

Does anybody now what kind of welding is used on these elements? Should I take it to a general appliance place to get them to change the wiring around and weld the wires back? I am more than capable of rewiring and understanding electrical circuits...but have no experience with welding things.....I assume solder would just melt away in 2 seconds.

Mal can you help out here? I know you changed elements around in your Aldi rotisserie. How did you do it?

[bluedevilfish]

Re: Rotisserie roasting (electric oven)

Hey Wushoes,

See also this post from couple of years ago from Andy Freeman. His rotisserie oven was only rated 2.5 RPM which he thought was good enough. He did up to 500g roasts but eventually converted the oven to gas. This brought the roast times done substantially. Some people cant help tinkering. The engineer side of you will appreciate his modifications!

http://coffeesnobs.com.au/YaBB.pl?num=1090196434

Matthew

[TC]

Re: Rotisserie roasting (electric oven)

Thanks for the advice bluedevilfish!

My rotisserie seems to only use the top 2 heating elements! OH NO!!! I want all 4 elements on

UPDATE: I have hacked the circuitry and made the rotisserie constantly spin all the time on all settings.

Here are the featured settings:

1) Grill - top elements only
2) Rotisserie - top elements only
3) Toast - top and bottom elements
4) Bake/Roast - bottom elements only

So now I can select setting 3 (toast - both top and bottom elements on) with the rotisserie on. So essentially a hybrid between setting 2 and 3.  ;D ;D ;D ;D

One thing that annoyed me though is that there is no chance of increasing the RPMs on the motor....as it is rated 2.5 RPM on the actual motor sticker. Might have to put in a new one....but not keen on opening the casing again...it was a pain to put back on....got one very deep cut on my finger for my efforts.

Wushoes- I have found a sweet spot of around 500g green with mine. I pre-heat to max on all elements and then load. I leave it at max and then back it off to 235 via dial when the thermostat cuts out there. I get 1st crack around 18 min and then ease back a fraction to aim for 2nd at around 22 min.

Im not sure if the slower rate of revolution affects the roast, but mine seem to degas more rapidly when compared to the hottop....

[Wushoes]

Re: Rotisserie roasting (electric oven)

Thanks for the advice bluedevilfish!

My rotisserie seems to only use the top 2 heating elements! OH NO!!! I want all 4 elements on

UPDATE: I have hacked the circuitry and made the rotisserie constantly spin all the time on all settings.

Here are the featured settings:

1) Grill - top elements only
2) Rotisserie - top elements only
3) Toast - top and bottom elements
4) Bake/Roast - bottom elements only

So now I can select setting 3 (toast - both top and bottom elements on) with the rotisserie on. So essentially a hybrid between setting 2 and 3. ;D ;D ;D ;D

One thing that annoyed me though is that there is no chance of increasing the RPMs on the motor....as it is rated 2.5 RPM on the actual motor sticker. Might have to put in a new one....but not keen on opening the casing again...it was a pain to put back on....got one very deep cut on my finger for my efforts.

[bluedevilfish]

Re: Rotisserie roasting (electric oven)

Wushoes,

Dont get so technical.  The beauty of this roasting method is that there are no modifications to make to the oven.  To make the drum use sharp pointy tinsnips to cut the holes in the can.  If you plan it correctly you can fold back the excess tin adjacent to the long slots to make the agitating fins.  It takes about ten minutes to set out and fifteen to cut neatly.  Drill all your rivet holes first as the milo tin will be weaker after you cut the slots.  Wrap your mesh around the outside, rivet and youre away.

Please refer back to dkelly60 link in my previous post.  

My oven doesnt revolve very fast and it doesnt seem to make a difference.  Why dont you give what you have a go before planning modifications to the oven.  I dont think they would be necessary unless you want to do large batches.  In which case higher rpms and higher temperatures would be useful.

Take the path of least resistance.  You might be suprised at the results.  

Happy drum making. ;D
Matthew

[Wushoes]

Re: Rotisserie roasting (electric oven)

The 2.5 RPM I measured earlier today seems so slow....I think I need to hack the roaster to get the motor to go faster....to atleast 10 RPM?

Anybody have an electric rotisserie oven and can tell me if 1500-1630W is enough power to roast? I will have to get a DMM and K-type thermocouple to measure the temp on the side of the tin wall

[robusto]

Re: Rotisserie roasting (electric oven)

Obviously a gas barbecue will produce more than enough heat....but the greater the bean mass, the longer it will take to roast. You are right.

My arbitrary 400 gram limit is due NOT to physical constraints, but the desire to keep roasted beans fresh until fully consumed. Approx a week.

-Robusto

[Wushoes]

Re: Rotisserie roasting (electric oven)

How big is your Milo tin?

I just want to get an idea of how much I can roast in it....maybe I should limit myself to about 300g as I think the oven may be a touch weak.

The oven is rated at 230v-240v and 1500-1630W. I assume it will operate at 1630W at full power as we run on 240v? Is this strong enough? There are two straight elements on the top and bottom.....so a total of 4 elements.

[robusto]

Re: Rotisserie roasting (electric oven)

Seeing through the holes is very difficult, either with the drum rotating or stationary. The chaff tends to obscure the true colour of the beans.

Which is why I time the roast.....time first crack, then use some very calculated guesswork as to when to stop. Usually approx 2.30 mins after the first few snaps, perhaps even to the start of second crack.  

The system always delivers evenly roasted beans.  I do 400 gram batches, but it will take more.

I cant seem to direct post pics from my own computer, but heres another, of the three vanes:

http://i2.photobucket.com/albums/y36/robusto/vanes.jpg

[Wushoes]

Re: Rotisserie roasting (electric oven)

Im an engineer not the arty farty creative type

[robusto]

Re: Rotisserie roasting (electric oven)

A blank canvass on which to start your artistic endeavour.....

Here is the milo tin drum roaster....

http://i2.photobucket.com/albums/y36...to/roaster.jpg

[Wushoes]

Re: Rotisserie roasting (electric oven)

Can you post a picture for reference?

How hard is it to see the beans inside the tin???

Heres what I have so far.....just a tin! :P

[robusto]

Re: Rotisserie roasting (electric oven)

Off to modify a 750gram milo tin which fits the rotisserie perfectly....I think :P

Ah yes, the old milo tin. Mines been in service now for almost 2 years, and still works well. The lid snaps on and is prised off easily with a screwdriver to empty out the roasted beans.

From my recollection, I drilled row after row after tedious row of holes along the curved tin so the beans would roast instead of bake. About 400 of them, I think.

If you can place a hardwood block inside while you drill, it cuts down on burrs and make for a smoother drum in which the beans can be agitated.

Oh yes, to agitate them, three pieces of aluminium angle iron about 20 mm x 20 mm are perfect, and easily rivited on.

Be prepared to go through a couple of drill bits in the process. ;D


But once again, make sure your oven doesnt go into meltdown with the 200º+ temperature required.

-Robusto

[Wushoes]

Re: Rotisserie roasting (electric oven)

Off to modify a 750gram milo tin which fits the rotisserie perfectly....I think :P