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Topic: Trouble roasting today... (21 msgs / 394 lines)
1) From: Dave
This afternoon I started roasting 300g of Tom's Espresso workshop #9 blend
in my Behmor. I know it takes about 16 minutes to do a 300g batch. 5 minutes
into the roast I decided to make a quick pitstop, after all it was too early
to worry about a runaway roast or a fire... When I got back the roaster had
stopped. Uh-oh must have popped a breaker. No that wasn't it, the roaster
was showing Err6. OK, now what??? Unplug and try again. Nope no good, now I
have Err1. Apparently after the Err6 I should have just quit right there:(
I went to the Behmor website, and filled out their customer service form. So
far no word back, but it's only been a few hours on a Friday afternoon.
So what to do with the partially roasted beans... I decided to try a wok
roast. I went looking for our wok, and the only wok-shaped pan I could find
is non-stick. Better not use that. I settled on a small heavy aluminum
skillet. I got out my bean chiller, which I haven't used in a couple years,
put the pan on the stove and went to work. I lost a couple beans over the
edge of the pan, it really was too small, but eventually ended up with a
very melange looking but acceptable roast somewhere around a Full City + ( a
few snaps into 2nd) I haven't brewed any yet, and while I don't expect too
much from this roast, I think I've got a shot at it making a "not bad" cup.
I decided that next time I'd try a whirly popper. So tonight I did 300g
batch of Nicaragua Finca San Jose in that. It hit first crack at about 11
minutes, and finished at about 14 with a nice looking city + roast. I'm
looking forward to this one:)
I'm certainly gonna miss the Behmor, but I guess I'll be able to survive
until its fixed.
Dave
Some days...
It's just not worth chewing through the leather straps
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2) From: Tom & Maria - Sweet Maria's Coffee
Boy did I have trouble today - got sidetracked while roasting a small 
batch in the Behmor and went to 5th crack, filled the whole place 
with smoke. Well, we know exactly what the problem is in this 
scenario.
I am not sure of the problem youa re having but maybe someone else 
can help. I have ever seen ERR6 personally. Joe is on a much needed 
vacation with his wife, but I think he will have someone answering 
emails. Probably not on a Saturday though - best bet is the list here 
and the forum.
Tom
<Snip>
-- 
-Tom
"Great coffee comes from little roasters" - Sweet Maria's Home Coffee Roasting
               Thompson & Maria -http://www.sweetmarias.com     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - info_at_sweetmarias.com
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3) From: Bonnie Polkinghorn
Hello Dave,
I had those same exact errors.  I needed to replace the motor and the board.
 They were able to send my parts overnight.  They sent detailed instructions
on how to un-install the old and install the new.
The funny thing is, I was looking at the emails I sent, and my err6/err1
occurred on Thur. June 11, 2009.  How odd is it that your failure occurred
on the same exact date, one year later.
Thanks to help from my father-in-law, I was up and roasting again on Wed.
6/17.  I'm sure the parts arrived on Tuesday.
Good luck,
-Bonnie
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4) From: Bob Hazen
A year ago, I encountered Err6.  It turned out to be a dead motor.  It was 
pretty easy to repair.  The cost was $20 and Behmor was kind enough to send 
it on the basis of an email exchange without waiting for payment.  They just 
said "send us a check."  Although I was disappointed the motor went tango 
uniform, Behmor sure took good care of me.
Bob
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5) From: Rich
When my motor died I found that he actual motor was still OK but the 
gear box lubricant had dried out.  If you keep trying to make it run you 
burn out the  motor though.  Getting original motor out and replaced is 
a real chore if its an early version original roaster.  The replacement 
has a redesigned mounting which makes replacement a simple job.  The 
high temperatures experienced in the chamber are what causes the 
original grease to fail.
Bob Hazen wrote:
<Snip>
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6) From: BSGarley
I had an Err6 over a year ago. The drum stopped rotating. I unplugged and
rotated the drum a bit by hand, then restarted. Has worked fine ever since.
Since I have an early Behmor, maybe I should think about regreasing?
Bruce 
Plant Whisperer

7) From: Rich
Removal and replacement is a real job with the early ones.  You have to 
use a 500F or above drop point synthetic grease.  Something from Nye 
Lubricants works well.  Figure it will be close to 100.00 for the grease 
though.
BSGarley wrote:
<Snip>
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8) From: Tom & Maria - Sweet Maria's Coffee
<Snip>
!!!  I have a few different lubricants I use on roasters that can 
handle high temps and don't cost that - I am sure that is amazing 
grease, but since it is not a food contact point it seems there might 
be other options. Glad to see this topic come up though, I didn't 
realize that there was an issue with lubrication, esp on early models.
-- 
-Tom
"Great coffee comes from little roasters" - Sweet Maria's Home Coffee Roasting
               Thompson & Maria -http://www.sweetmarias.com     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - info_at_sweetmarias.com
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9) From: Dave
Yeah, mine is an early Behmor, one from the first shipment. Oh well:(
The Nicaragua cup I brewed this morning from yesterday's first ever (for me)
whirly pop roast is delicious. So at least I know I'll have coffee:)
Dave
Some days...
It's just not worth chewing through the leather straps
On Sat, Jun 12, 2010 at 8:56 AM, Rich  wrote:
<Snip>
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10) From: Rich
There are several lubricants that would work but they basically have to 
be a thickened oil and not a conventional soap based grease.  That 
little gearbox gets right hot as the drive shaft transfers the heat 
right back inside of the gearbox and just slowly vaporizes the grease. 
This tends to ague against a silicone based grease as it will vaporize. 
  To get the original out and back in you have to capture the 2 nuts and 
that is a trick.
I have no idea how much of an issue it actually is but the one I have 
here failed from lack of adequate grease.  It would still run until it 
got hot and then it quit.  The replacement also has a bit of free motion 
between the gearbox output shaft and the drum drive coupling while the 
original is tightly pinned with a roll pin.  Keep in mid that the 
roaster i have came over in the first batch.  I suspect that things have 
been updated a bit in the intervening time.
Tom & Maria - Sweet Maria's Coffee wrote:
<Snip>
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11) From: Phil Palmintere
just "thinking out loud" here... i wonder if the thermal grease used
between a computer's CPU and its heat exchanger would work.
On 6/12/10, Rich  wrote:
<Snip>
-- 
Sent from my mobile device
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12) From: jon morgan
Does a CPU get that hot?
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13) From: Rich
That is a pure silicone grease.  will not work.  The gears are a high 
temp nylon so you have to avoid some lubricants or the nylon will get 
brittle.  And they may not be nylon, just looks like it.
Phil Palmintere wrote:
<Snip>
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14) From: Rich
A max operating of 60C is not uncommon.  Some will survive at higher 
temperatures.
jon morgan wrote:
<Snip>
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15) From: Phil Palmintere
I just checked... you're right; the typical operating temperature of most
modern CPUs is quite a bit lower than the 500-ish degrees of a roaster.
<Snip>
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16) From: Alchemist John
It was not actually any high temperatures in the chamber that caused 
the spat of motor failures at the beginning.  The factory actually 
put in an additional lubricant 'just to be safe' but it turned out to 
be incompatible with the existing lubricant if used in to high a quantity.
These motors are not meant to be lubricated to the best of my knowledge.
At 09:05 AM 6/12/2010, you wrote:
<Snip>
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17) From: Rich
The motor is not but the gearbox is.
Alchemist John wrote:
<Snip>
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18) From: Allon Stern
On Jun 14, 2010, at 12:07 AM, Phil Palmintere wrote:
<Snip>
Once upon a time, I attempted to build a "PC-BAKE" oven, using the power from 4 pentiums to bake a cake.
Sadly, it was a failure; if I'd had more time than the weekend build (at a conference), I might have overcome some issues.
(just a clock wasn't enough; I would have had to provide the CPUs with an instruction stream to really draw the power)
Anyway, my typical high-temperature grease is a prized jar of high temperature silicone vacuum grease. A teeny bit goes a long way; it is tenacious stuff, and will not outgas any nasty volatiles (being made for vacuum work).
Don't think it's particularly food-safe, though, but for a gear-train that doesn't contact food, it would be okay. Dunno about the nylon vs. silicone concept. Any references to back up the assertion that it will damage them?
-
allon
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19) From: Rich
Silicone and nylon are fine.  Plain petroleum is OK.  PAO synthetic is 
probably the best for a high temperature application though.  Some of 
the possible additives/thickeners in some greases will cause nylon to 
fail over a fairly long time period. Remember the Chevy nylon timing 
gear?  Hot engine oil is hard on nylon.
The gear shafts in the motor gearbox are running in the base metal of 
the gearbox.  The original design has the output drive coupling tightly 
attached to the output gear shaft.  The weight of the drum is supported 
on this bearing surface.  The revised design has the output coupling 
loosely pinned to this shaft. The drum coupling is now partially 
supported by the cavity wall seal.  This has the benefit of reducing the 
axial load on the gearbox output shaft. It is possible that with this 
present design additional lubricant may not be required.
Allon Stern wrote:
<Snip>
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20) From: Phil Palmintere
It is certainly conceivable to make a PC-BAKE oven as each of the CPUs would
dissipate about 110 watts or so.
On youtube there is a video of someone running a PC without the heat sink on
the CPU - after a short while, the CPU gets SO HOT it literally explodes &
turns into shrapnel.  
<Snip>
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21) From: Allon Stern
On Jun 15, 2010, at 5:57 PM, Phil Palmintere wrote:
<Snip>
Yes, but I was just running bare CPUs with Power and Ground, and a simple clock oscillator.
As noted, it was time-constrained hack, and I didn't have the time to really make it work; woulda been cool, though.
-
allon
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