HomeRoast Digest


Topic: Moving tradition (10 msgs / 356 lines)
1) From: Zara Haimo
This is a multi-part message in MIME format.
As my new kitchen nears completion, I'm clearing out some old things I =
no longer need and don't want to move.  I have a Hearthware roaster with =
a fried control board (it got wet, alas).  The glass roasting chamber is =
still usable as is the chaff collector although one of the plastic pins =
that holds the chaff screen in place is gone.  If you can use the glass =
chamber and chaff collector, send me an email off list and my son will =
pick a name out of his hat Sunday morning.  If you think you can do =
something with the base despite the fried board, let me know that too.

2) From: Zara Haimo
Someone asked me which model - I have the Home Innovations Precision model
with the white base.
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3) From: miKe mcKoffee
You mentioned it's "electronic" controls are fried. I suspect it could be 
hacked to by-pass and then better yet split wired independent on/off to both 
heater and fan without not too much hassle. This would/could also enable 
dual variable voltage control which of course means total control of the 
roast profile and greater flexibility in batch size.
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer etc.http://mdmint.home.comcast.net/coffee/Rosto_mod.htmFrom: "Zara Haimo" 
Sent: Thursday, May 12, 2005 8:36 AM
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4) From: Zara Haimo
If someone else wants to take on this project, enter the tradition drawing.
I am happy with my dog bowl and heat gun plus I still have Alfred's HotTop
which will probably work just fine once I have time to figure out why it was
DOA and I may add one of Ron's drums once I get a BBQ.  I never could hear
the cracks on the Precision!

5) From: petzul
First I want to say thanks for offering this tradition. When I first 
started on this list I decided I wanted a Hearthware, but the old ones 
were out of stock, and the new version would be in 'soon'.
While waiting I got into poppery roasting and really liked the control 
with dual voltage setup. My poppers could roast more than the I-roast, 
so by the time they became available I was beyond them. Besides I could 
fix my broken poppers (they never broke though) if I had to, and folks 
were sending back their HW for repairs.
It is fun to look back over trial and error things. When the threads 
went to roasting larger batches, I just had to do that, now I can do 2 
pounds easily, but have cut back to a little less than a pound because 
that much ages about right before it is used up. I will roast two pounds 
on occasion, when it will be used up over a weekend or some such..
Anyway, the Hearthware roaster is tempting, I bet it is meatier than the 
popper, and I bet it could tweaked it to do much more than a popper, 
after all it was designed to roast coffee. With dual voltage control the 
profiling would be awesome. Then you could PID it.....
PeterZ
Has too many roasters already, here in LHC
Zara Haimo wrote:
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6) From: Michael Dhabolt
PeterZ and miKe have me thinking.  It would be neat to see if my
control box would move over to a split wired unit like this.  Would be
a fun project (like I need another).
Neat tradition Zara.
Mike (just plain)
On 5/12/05, petzul  wrote:
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7) From: Philip Keleshian
I have an HWP and I have hacked it a good bit.  I would agree with what =
Mike is saying.  If anything this will be a better machine with external =
controls and a thermometer to measure the bean temperature. 
The fan motor is a universal motor similar to that in the Poppery I or =
Rosto.  Hearthware controls the temperature with fan speed.  The heater =
is on fully for the duration of the roast cycle.
If you can be content with the intended capacity (~2 oz if I remember) =
the control can be very simple.  Simple ON/OFF switch for the heater and =
an incandescent lamp dimmer for the fan.  I was able to profile roast =
with mine.  Without control of the heater The ramp is to fast below ~300 =
degrees F.  To do the drying / stabilizing at about 230 degrees F you =
will need reduce the heater power or up the fan speed.
That step-up transformer with lamp dimmer which Mike has described may =
be sufficient.  If that doesn't do it a 15 amp diode switched in series =
with the heater should do the trick.
My electronics in my HWP still works so I control mine by getting into =
the feed back loop.  Even asking for full cool the temp would ramp to =
fast below 300 degrees F. My next hack was to be control of the heating =
element but I moved to a Z&D and my hacking efforts have been confined =
to it lately.
Phil

8) From: Ed Needham
OK Phil, care to elaborate on how you hacked your HWP?  This is a first for 
me.  I have not seen any electronics hacks on a Precision.  Pictures? 
Equipment?  Please!
*********************
Ed Needham
"to absurdity and beyond!"
ed at homeroaster dot com
(include [FRIEND] somewhere in the subject line of any email correspondence)
*********************

9) From: Philip Keleshian
Hi Ed,
Unfortunately when I was Hacking the HWP I was a total baby in digital =
photography.  I don't have any photos of it. The glass chamber cracked =
and I am in the process of replacing it wit the closest piece I could =
find.
I did however post some PDF schematics on the Coffee Geek site. There is =
one of the schematic of the OEM machine. There is also one of my mods. I =
also included a link to a string which includes my Z&D hacking.  The =
concept of the thermocouple guide tube in the Z&D is very similar to =
that which I used in the HWP. By the time I got to the Z&D I was a =
digital photography toddler.
Basically HWP controls the air temperature by measuring the temperature =
with a thermistor (the little glass diode looking thing in the air =
stream.  I control the bias of the thermister with the pot which was =
formerly used for time.  Who need that any way? 
It works fairly well except at the lower temperatures you may want at =
the beginning of the roast.  Even wit the fan running at full speed the =
temperature ramp is fairly fast below 300 degrees. Above that it is =
pretty good.  I have some ideas for controlling the heater power but so =
far they are only in my head and not fully baked.
Here are the links:http://www.coffeegeek.com/forums/coffee/homeroast/29149Phil">http://www.coffeegeek.com/forums/coffee/homeroast/27214http://www.coffeegeek.com/forums/coffee/homeroast/20111?Page=3http://www.coffeegeek.com/forums/coffee/homeroast/29149Phil

10) From: Zara Haimo
This is a multi-part message in MIME format.
John Huddle is the winner of the Precision roaster base with the fried =
board.  I have his snail mail address and will send it on to him. I =
still have the roasting chamber and chaff collector - if anyone needs =
them, please get in touch with me off list.


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