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liyang
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Post subject: BeanBrowner Mark I Prototype
 Posted: Jul 15, 2009 - 11:57 AM
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Joined: Aug 18, 2007
Posts: 13
Location: Beeston, Nottinghamshire
Status: Offline
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Here's the link if you want to twit: http://img.ly/1HD
Total cost, not including time and tools and instruments: £20. The (de-varnished) Illy tin was another £4 I think.
That is all for now. Got to get to work. =) |
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| BeanBrowner Mark I Prototype |
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darrensandford
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Post subject: RE: BeanBrowner Mark I Prototype
Posted: Jul 15, 2009 - 02:41 PM
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Joined: Feb 21, 2008
Posts: 379
Location: Coventry, UK
Status: Offline
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Haha! That's an awesome looking device, well done! Will be interested to see what it produces.
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triptogenetica
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Post subject: RE: BeanBrowner Mark I Prototype
Posted: Jul 15, 2009 - 05:57 PM
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Joined: Jul 27, 2008
Posts: 395
Location: Oxford, UK
Status: Offline
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Ah, that's the mini oven I've been using for home roasting!
(I found that a popper gives me a more even roast, but in smaller volumes. A baking tray, occasionally stirred, in that oven gives a larger amount, but not as even. Hopefully the rotisserie drum should improve on this)...
How did you get the spindle mounted in the oven - have you added bearings of some sort? (I thought about doing this to ours, but we also use it for all oven cooking that doesn't need the big oven. It's very mini, but does a good job. So my GF would be unhappy if I made this out of it).  |
_________________
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Aeropress, Cona C, Hario MCA-5 and TCA-5 vacpots
Beans - Behmor homeroast
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CakeBoy
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Post subject: RE: BeanBrowner Mark I Prototype
Posted: Jul 15, 2009 - 06:42 PM
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Joined: Oct 18, 2005
Posts: 9604
Location: Oxfordshire, England
Status: Offline
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| Nice one Liyang How are the roasts? |
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liyang
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Post subject: Re: BeanBrowner Mark I Prototype
Posted: Jul 15, 2009 - 11:36 PM
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Joined: Aug 18, 2007
Posts: 13
Location: Beeston, Nottinghamshire
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CakeBoy wrote:
Nice one Liyang How are the roasts?
Well, the one on the left is Steve's Machacamarca; the one in the middle is mine, roasted at what I *thought* was a flat 250ºC profile, but may actually have been closer to 270ºC†; and the one at the right is my Colombia La Manuela at what I thought was 230ºC — I was trying to drag out the roast — but probably closer to 250ºC†. (Don't have Steve's to compare, sorry.)
The Columbian came out somewhat under-roasted — was getting dark and I couldn't see very well — but the colour is very even. I think I stopped it half-way between first and second crack; I may have been a tad too conservative here as I've not quite figured out where the line is drawn between the first and second…
I suspect the mild unevenness of my Machacamarca is due to the ridiculously high temperatures. They do look slightly browner than Steve's, and I'm not sure I heard the first crack, which confused me. It was light enough at that point for me to see that I ought to stop the roast, however.
Σ:3
/Liyang
† Bad placement of the thermocouple probe on my part. |
| Description: |
| Steve's Machacamarca; Mine; and My Colombia La Manuela |
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liyang
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Post subject: Re: BeanBrowner Mark I Prototype
Posted: Jul 16, 2009 - 12:47 AM
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Joined: Aug 18, 2007
Posts: 13
Location: Beeston, Nottinghamshire
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triptogenetica wrote:
Ah, that's the mini oven I've been using for home roasting!
Ah, I've been reading your Wiki entry!
triptogenetica wrote:
A baking tray, occasionally stirred, in that oven gives a larger amount, but not as even.
I never figured out how you could stir it without a significant temperature drop. D: That's what stirred me into concocting this harebrained idea, so it wasn't a bad thing…
The BeanBrowner Mk I has comfortably done 125g so far. Could perhaps go up to just under 200g… further tests needed; the Illy tin is rated at 250g — I'd have used a larger vessel had I found something suitable. Burning all the varnish off the tin with a crème brûlée torch nearly melted the front of mine…
For a steel tin, it's next to impossible to drill clean, circular holes on the side (already ruined another Illy tin), so I made four 45º cuts — with abrasive cutting discs‡ on a Dremel knock-off — in a pretty snowflake pattern instead. Use a few‡ rotary wire brushes to clean the cuts from the inside and out.
triptogenetica wrote:
How did you get the spindle mounted in the oven […]?
I took out the thermal cut-out fuse from the control side of the oven, drilled a hole through both the metal tab and the oven wall on the right. (Use a HSS bit for this. If you don't have a centre punch, abuse a sharp wood screw with a hammer to mark the spot.) On the left I just drilled a hole in the same position.
The spindles are actually 100mm M6† carriage bolts from Wilkinsons, with one on the right fixed in place by squeezing a nut in between the tab and the oven wall on the outside. Another pair of nuts tightened against each other act as a stop for the drum. There's a metal tube† running through the middle of the (no longer recognisably Illy) drum, fixed in place at the open end by thick (stripped) gardening wire, illustrated in the photo below. (X cuts along the ridges on the neck of the tin to make holes for the garden wire.) At the closed end I intended to solder the tube to the tin, but haven't done so yet — there's probably no need.
For the cap, drill a centred hole, and clamp it tight between two oversized M6 washers, in turn in between a pair of nuts. Leave an inch of the bolt showing, to plug in to the end of the tube above held in position by garden wire. In between the end of the bolt and nut, put on another section of steel tubing — crimp one end slightly so it won't slide about — to give a smooth surface that can rotate freely in the hole you've drilled on the left oven wall. Maybe add a few dabs of silicone grease, though I haven't needed it myself yet — coffee oil seems to work. At the cap end of the bolt, you can fix a long thin piece of wood, to use as a handle… (not in my first, or any of my photos, yet.) Note if you are actually building this, it may be less frustrating to read this paragraph backwards.
Oh and you'll want to stuff some tin foil around the inside of the tin lid, firstly to stop beans from getting jammed in between the tin and its lid — there'll be a gap since you'll have removed the plastic parts — and subsequently expanding, making the two almost impossible to separate at high temperatures, and secondly to provide a little extra friction so the drum would rotate.
triptogenetica wrote:
I thought about doing this to ours, but we also use it for all oven cooking that doesn't need the big oven.
It's £13 from Argos at the minute. You have no excuse. Other than the lack of time. This took me about two days — interspersed with bits of PhD work — to put together.
Apologies for the brain-dump. I figure I ought to get all the details down while they're still fresh.
later,
/Liyang
† The tube is actually the inner rod of Wilko's 60cm to 100cm telescopic window net rod, stripped of its plastic covering. I bought the M6 nuts and bolts to match. You may want some other size.
‡ I went through half a dozen abrasive discs, and two wire brushes. Haven't quite factored in the cost of those. |
| Description: |
| This is an ex-Illy tin. It has kicked the bucket. It has ceased to be. |
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liyang
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Post subject: Re: BeanBrowner Mark I Prototype
Posted: Jul 16, 2009 - 12:54 AM
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Joined: Aug 18, 2007
Posts: 13
Location: Beeston, Nottinghamshire
Status: Offline
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liyang wrote:
I suspect the mild unevenness of my Machacamarca is due to the ridiculously high temperatures. They do look slightly browner than Steve's, and I'm not sure I heard the first crack, which confused me. It was light enough at that point for me to see that I ought to stop the roast, however.
I should point out that during my taste test, the two were very similar. I'd struggle to tell the difference, but then my palate isn't as developed as a professional cupper, and I've probably killed most of my taste buds by being fed — what would be to most British people — uncomfortably hot (as in, spicy) food since birth. |
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GreenBean
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Post subject:
Posted: Jul 18, 2009 - 10:18 AM
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Joined: Jan 03, 2007
Posts: 1711
Location: Chester
Status: Offline
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| Very impressive Liyang. |
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triptogenetica
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Post subject:
Posted: Jul 18, 2009 - 12:19 PM
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Joined: Jul 27, 2008
Posts: 395
Location: Oxford, UK
Status: Offline
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Liyang, thanks for the write-up! (I imagine it's also a welcome break from writing up the PhD). It's good to see someone improving that oven - maybe we should get this added to the wiki...
As for stirring - I was simply opening the door as little as possible, reaching in with a fish-slice, and giving everything a good stir. Not ideal, but you get quite deft at at after some practice.
For an excuse not to do this - I gave in and now have one of Joe Behm's exciting roasters. Otherwise this would be my next project. As it is, though, i think my flatmates will quite like the smoke suppression stuff Behm has invented  |
_________________
Bezzera BZ35 (ex Gaggia Carezza)
Grinders - Iberital MC2, Bezzera BB105, Hario Skerton
Aeropress, Cona C, Hario MCA-5 and TCA-5 vacpots
Beans - Behmor homeroast
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Joris
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Post subject:
Posted: Mar 05, 2010 - 10:59 AM
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Joined: Dec 14, 2005
Posts: 1751
Location: The Hague, Netherlands
Status: Offline
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| Nice DIY project |
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qwerty69
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Post subject:
Posted: Mar 05, 2010 - 08:40 PM
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Joined: Oct 17, 2009
Posts: 135
Location: Just outside Glasgow
Status: Offline
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What a fantastic use for a tin of Illy, tell me you didn't make coffee with the beans though  |
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Post subject:
Posted: Jan 31, 2011 - 02:15 AM
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Joined: Jan 08, 2011
Posts: 192
Location: Belfast, N,Ireland
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qwerty69 wrote:
What a fantastic use for a tin of Illy, tell me you didn't make coffee with the beans though
I think it may only technically be named coffee if Illy beans were used, have you seen shelf life Illy proudly stamp on the tins of roasted beans,,, it's about two years! |
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