HomeRoast Digest


Topic: Roastus Interuptus (17 msgs / 437 lines)
1) From: miKe mcKoffee
Why redundancy is a good thing! Friday morning started to roast a Rosto half
pounder when suddenly the fan motor croaked. Not screeched or screamed but
ground to a halt as in stopped. Fortunately it was during the first
pre-tanning equalization stage and hadn't hit 300f quite yet. So immediately
killed all power, dumped the beans into Rosto #2 and fired away quickly up
to 300f then onto normal profile. (Rosto #3 has been sitting over a year
needing it's fan motor replaced so now roasting without a functioning
backup.)
'Twas a batch of Guat' Antigua PB, turned out just fine.
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc:http://mdmint.home.comcast.net/coffee/Rosto_mod.htmUltimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.

2) From: Les
Mike,
I ran out of propane last night at about the same stage and had my backup
tank ready to go!  I hate it when that happens.  The nice thing about the RK
system is even if the motor burned out, I could finish the roast by turning
by hand.  I know one RK owner who has a hand crank and roasts that way all
the time.
Les
On 12/19/06, miKe mcKoffee  wrote:
<Snip>

3) From: Eddie Dove
mike,
Just curious ... can you get replacement motors or rostos?
Eddie
On 12/19/06, miKe mcKoffee  wrote:
<Snip>

4) From: raymanowen
*Roastus Interruptus*, El Stoppo or Schnell Halt are the signs I should hang
to name my cosmopolitan wind tunnel that exists for the short stopping of
roasting. [Press #1 for English]
I have redundancy among the poppers and Fresh Roast. If I'm doing 400- 600g
with the HG/DB, and my Wagner HG suffers the Blue Fire Syndrome like
Glorious Orange did, not to worry because, as miKe says, it will be just
fine.
In fact, I was roasting 400g of Guatemala Antigua myself. First Crack had
just begun when Glorious Orange cooled off and I had a handful of popping,
smoking, electric Blue Fire.
Much cheaper than cigarettes, but still $9.99 straight to Hell!
Cheap lesson- It worked fine to cool the roast at 1st Crack start and can
it, taking out a couple of Fresh Roast batches to continue the roast until I
got my Wagner HG at Lowe's.
Right now, I'm enjoying Panama Auction Lot -Don Pachi "Geisha" at C+. I've
had this 18 months [6-17-05] in the pantry in its original SM Ziploc bag.
I got the first snap of Second, then backed off til I got two more snaps.
Then it took both hands to pull the heat gun away. But The Man said "C+."
Pain, but the Grand Slam ended it before another snap peeped out of the 250g
batch.
That was 84 hours ago. Oh, my- this is some Splendid Coffee- 42g ground at
47 in Grinder M. Right into the TV cone, stalled the brew until the grounds
were completely saturated for 30 seconds and swished by rotating the cone
basket on its holder platform.
Oh, this flavor is Wicked good. Fabulous aroma, rainbow of flavors reminds
me of Jungle Survival school at Clark long ago.
Cheers -RayO, aka Opa!
Mmm- Masarap! Ayos na ang Kasunod!

5) From: miKe mcKoffee
This is a multi-part message in MIME format.
Once upon a time there was a US Importer/Distributor but no longer. I
purchased some spare fan motors way back when but only have two, both needed
now. I don't know a current source.
 
miKe  
From: homeroast-admin
[mailto:homeroast-admin] On Behalf Of Eddie Dove
Sent: Tuesday, December 19, 2006 10:07 AM
To: homeroast
Subject: Re: +Roastus Interuptus
mike,
Just curious ... can you get replacement motors or rostos?
Eddie

6) From: Barry Luterman
This is a multi-part message in MIME format.
I see an RK drum in your future

7) From: Eddie Dove
Maybe one of the electonics experts on the list can tell you of a suitable
replacement ... may have to ship them a dead one.
Eddie
On 12/19/06, miKe mcKoffee  wrote:
<Snip>

8) From: raymanowen
On 12/19/06, miKe mcKoffee  wrote:
<Snip>
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976

9) From: raymanowen
Idiot Kid- quit with the button pushing...
miKe, I'd be willing to wager that your motors will be totally simple to get
running again.
It's a cinch that the blower motor in a roaster doesn't have brushes. It
would be a shaded pole induction motor.
Take el Rosto apart and stick a toothpick against the  motor armature so you
can spin it a little. Those little motors have nil starting torque, so if
the armature is a little stiff, it will never start. They're impedance
protected, so a stuck motor won't burn up
Assuming you can't find a likely replacement at W.W. Grainger or the Surplus
Center, you can free the motor armature with some spray electrical contact
cleaner or WD-40 on the bearings. Ditto the oil felt on each bearing.
If the motor spins freely, clean and lube the bearings with light sewing
machine oil anyway. Avoid the rush. do it now
With the motor spinning freely, check the electrical continuity of the
winding. With a DVM, you should disconnect one of the motor leads, so you
can read just the resistance of the coil.
Set the meter to read on the 20K ohms scale and touch the two probes
together to make sure you actually see 0.000 ohms on the readout. Then stick
the probes on the two motor terminals. "1  .    " means the coil is open or
the thermal fuse is gone, if there is one.
If you get too aggressive with recirculating heat, that could account for
either dry stuck bearings or an open thermal fuse. In the latter case, you
can rescale its calibrated temperature and current range with a piece of
copper wire, or just bypass it altogether.
Cheers -RayO, aka Opa!
"The indisputable truth is that no coffee is fresh if it isn't fresh
roasted." - - Martin Diedrich

10) From: miKe mcKoffee
<Snip>
[mailto:homeroast-admin] On Behalf Of
raymanowen
<Snip>
	
<Snip>
simple to get running again. 
<Snip>
	
<Snip>
account for either dry stuck bearings or an open thermal fuse. In the latter
case, you can rescale its calibrated temperature and current range with a
piece of copper wire, or just bypass it altogether. 
<Snip>
Unquestionably I've pushed my Rostos hard on all fronts for ~6 years.
Unquestionably the culprit is the bearings, which first start intermittently
screeching/binding before failure. Have already replaced 2 fan motors, which
isn't bad in 6 years. Thermal fuses aren't an issue, they be time long
by-passed.
Routinely run fan motor designed for 120v at 144v, routinely run heater
designed for 120v up to 132v at times during profile, routinely recirculate
50% more exhaust than designed (vents half covered during roast, full open
during cooling), routinely roast 1/2# when designed for 1/4#, routinely do
multiple back to back batches with only bean cooling cycle inbetween
batches.
Not really concerned at the momemnt. Thought I had two more fan motors and
just found a third on the shelf. So I'll be Rosto roasting for many more
years before needing to find another fan motor source.
	
No Barry, I've long since ruled out an RK Drum for our usage style. I like
1/2# batches having multiple different coffees roasted and rested at all
times. I also like the total near infinite profile control I have, more so
than possible with an RK Drum. (Can do roasts as fast as 5min FR emulation
or as slow as I want and anything inbetween.) The Rosto is the closest "off
the shelf" home roasting appliance to the venerable P1, though I believe the
P1s have longer lived fan motors. But can't say with 100% assurance since
have never pushed a P1 hard long term like I have the Rosto. Just too bad
Rosto manufacturing went through so many changes leading ultimately to it
being dropped from the US market. 
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc:http://mdmint.home.comcast.net/coffee/Rosto_mod.htmUltimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.

11) From: Michael Rasmussen
miKe mcKoffee wrote:
<Snip>
For the air poppers out there Walgreens currently has hot air poppers on sale for
$6.99 after rebate, $9.99 before.   It's a 1200W model.
-- 
   Michael Rasmussen, Portland, Ore, USA
  Be Appropriate && Follow Your Curiosity
       http://www.patch.com/words/

12) From: Brett Mason
Too expensive!  My Poppery ! was $3.50 a month ago at teh Salvation
Army in Orange, CA., and it's 1500 watts...
B
On 12/20/06, Michael Rasmussen  wrote:
<Snip>
-- 
Cheers,
Bretthttp://homeroast.freeservers.com

13) From: miKe mcKoffee
Was mid-roast testing a profile for 2# post roast batch size of decaf
espresso. Now this is an older building with "interesting" wiring and we
have two 100A breaker boxes. Being an older finicky setup every now and then
one of the two Mains trips killing the Linea and some other circuits. Not
often, has happened 3 or 4 times since we took over Nov 1st. Well, it
happened to happen while roasting. No, the USRC wasn't on the Main that
tripped. However, when Bruce went to reset the tripped Main breaker he
goofed and killed the other one so of course roaster died! He immediately
flipped it back on and the USRC reset and started the profile over. So I
bailed and went manual finishing the roast no problem.
Ok, decided to test that decaf profile again and fired off another 1125g
batch. Nope, no breakers tripping but wouldn't you know the Shitake can
shield decided to fail me and Flame-out! So re-ignited and finished manual
again. Neither time did actual bean temp drop though ramps did slow a bit
for a spell. But hey, it's only decaf! Yeah, I'm bad that way:-)
Now anquishly waiting for the high flame pilot unit. Seems the beefed up fan
motor Dan put on our roaster so could always run my profiles in "bean
cooling damper position" whether doing back to back roasts or not caused
some unexpected consquences that unfortunately didn't show up running NG at
the factory but only LPG. I'll continue on tesing and tweaking profiles
though limiting fan to 80% and see if it helps.
Now off to prep some Copper River to grill for dinner...
Kona Konnaisseur miKe mcKoffeehttp://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
Sweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com

14) From: Jim De Hoog
Mike,
It sounds like it is always an adventure in your shop.  
But what I want to know is how you prep and grill Copper River?  Charcoal filters or RO?  Noticed it wouls be mesquite grilled, so is the Copper River in a container to keep from quenching the fire?  
Just had to ask
Jim "Ice Bucket Roaster" De Hoog
----- Original Message ----
From: miKe mcKoffee 
To: homeroast
Sent: Tuesday, February 19, 2008 9:27:01 PM
Subject: [Homeroast] Roastus Interuptus
Was mid-roast testing a profile for 2# post roast batch size of decaf
espresso. Now this is an older building with "interesting" wiring and we
have two 100A breaker boxes. Being an older finicky setup every now and then
one of the two Mains trips killing the Linea and some other circuits. Not
often, has happened 3 or 4 times since we took over Nov 1st. Well, it
happened to happen while roasting. No, the USRC wasn't on the Main that
tripped. However, when Bruce went to reset the tripped Main breaker he
goofed and killed the other one so of course roaster died! He immediately
flipped it back on and the USRC reset and started the profile over. So I
bailed and went manual finishing the roast no problem.
Ok, decided to test that decaf profile again and fired off another 1125g
batch. Nope, no breakers tripping but wouldn't you know the Shitake can
shield decided to fail me and Flame-out! So re-ignited and finished manual
again. Neither time did actual bean temp drop though ramps did slow a bit
for a spell. But hey, it's only decaf! Yeah, I'm bad that way:-)
Now anquishly waiting for the high flame pilot unit. Seems the beefed up fan
motor Dan put on our roaster so could always run my profiles in "bean
cooling damper position" whether doing back to back roasts or not caused
some unexpected consquences that unfortunately didn't show up running NG at
the factory but only LPG. I'll continue on tesing and tweaking profiles
though limiting fan to 80% and see if it helps.
Now off to prep some Copper River to grill for dinner...
Kona Konnaisseur miKe mcKoffeehttp://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
Sweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com

15) From: raymanowen
It's a fail-safe design that C/B's trip at progressively lower current over
their life cycle. If the reverse were the case, you'd be cruising for a
fire. -ro
On Tue, Feb 19, 2008 at 8:27 PM, miKe mcKoffee  wrote:
<Snip>
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com

16) From: Rich
Aftr having spent many years trip testing these things very refuel 
outage what you say is not correct.  The trip point tends to increase 
over time or in some cases it rapidly decreases.  the vast majority 
slowly increase.
The IEEE has published several documents in the AB series relating to 
the initial manufacturer trip testing and the subsequent in service re 
verification and periodic maintenance trip testing of circuit breakers. 
  these relate to the low voltage / current ratings normally sen in home 
light commercial applications.  IEEE dose not give these documents away, 
unfortunately.
The bottom line is that you can not make a definitive statement that the 
trip point will drift low over time.
raymanowen wrote:
<Snip>
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Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com

17) From: Larry Johnson
I once had reason to inquire of Westinghouse, how many trips could a
breaker of theirs perform and maintain its original specs. Their
answer was, "One." Not that it absolutely would *not* trip at the
correct place on the current[squared] x time curve, but they would not
guarantee that it *would*, either.
'Course, we were talking about a 1000 Amp breaker, but still.....
On 2/21/08, Rich  wrote:
<Snip>
-- 
Larry J
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