HomeRoast Digest


Topic: rocks in your beans? (13 msgs / 290 lines)
1) From: Steve Bien
I had a near miss the other day. I was hand grinding some coffee and found a
rock. If this had been my solis grinder that would have been the end I am
sure. 
In years of coffee grinding this has never happened before but from now on I
plan to scan the beans just to be sure. Has anyone had a similar experience?
Do others check for rocks?
Steve
How many of you check for rocks before you grind. While using a hand grinder
i found a small, bean sized rock. If I had been using my solis that would
have been it for the grinder. 
I've been grinding coffee for more years than I can remember and this is a
first. Be that as it may, I'm going to be looking from here on in. 
Steve
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2) From: Brian Kamnetz
Steve,
I scan for stones for a while after every post such as yours, but then
after a spell I am again lulled into complacency...
I'll be scanning now for a while.
Brian
On Mon, Jan 19, 2009 at 3:54 PM, Steve Bien  wrote:
<Snip>
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3) From: Jim Russell
I've found a few rocks or small chunks of concrete and once a chunk of
plastic mixed in with the beans over the years.  Seems like this is most
likely to happen with dry process coffees as they sit on concrete or tarps
on the ground to dry.  I watch for any non-coffee materials while I'm
separating out the chaff from the beans.  Haven't found anything in a while,
knock on wood.  I imagine even my Mazzer Super Jolly wouldn't enjoy chewing
on rocks.
Jim
On Mon, Jan 19, 2009 at 2:54 PM, Steve Bien  wrote:
<Snip>
-- 
Roasting them almost as fast as they come
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4) From: Allon Stern
On Jan 19, 2009, at 4:14 PM, Jim Russell wrote:
<Snip>
I check for rocks when I pour the beans from the bag onto the scale,  
from the scale into the roaster, and from the roaster into the  
storage bag; I've also spotted rocks while roasting, since light  
colored rocks might blend in with green beans, but not so much with  
brown ones.
Not all are rocks - sometimes there's a dirt clod thrown in.
-
allon
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5) From: Chad Osgood
I've had a few stones/pieces of concrete.  I generally find anything like
that during my cooling cycle and I've never found anything like that in a
commercial roast of course.  
One time a piece of what I guess was concrete almost made it to my Mazzer
Mini before I caught it.  It was pretty soft actually, so I like to think
the Mazzer would handle it well, but I'm not about to find out.
Chad

6) From: kevin creason
Yup, I've found a few rocks too. I put them (and a few from Allon) into my
patio. They're somewhere out there in the grout between flagstones.
I think I've ground a few though. I think some of them are very light
concrete flakes and crushed down easily, these  I think I found from yemen.
It's like you're grinding and all of sudden it slows down and you think
"what roast level was this again? white?" and then its back to normal.
Some stones would seriously damage the grinder.
On Mon, Jan 19, 2009 at 3:48 PM, Allon Stern  wrote:
<Snip>
-- 
-Kevin
/* Never argue with an idiot. They drag you down to their level and beat you
with experience. */
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7) From: Sandy Andina
I've managed to intercept some in batches of Harrar Horse after  
roasting but before grinding--they stand out better from the beans.   
Once, in a batch I i-Roasted, I got a popcorn kernel. Pretty easy to  
spot that one after the fact!
On Jan 19, 2009, at 10:32 PM, kevin creason wrote:
<Snip>
Sandy Andina
www.myspace.com/sandyandina
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8) From: Carol Lugg
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9) From: David Martin
I've found small stones and bits of masonry on a few occasions, but
nothing that would have been likely to destroy my grinder. I use a
very hands-on / eyes-on roasting method, so it's unlikely that a stone
would escape my notice.
-Dave
On Mon, Jan 19, 2009 at 12:54 PM, Steve Bien  wrote:
<Snip>
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10) From: Brian Kamnetz
Speaking of hands-on / eyes-on roasting method, I've been thinking
about this too. I've never seen a stone, etc., but the odds are that I
will get one at some point. I roast with a heat gun. I put the beans
into a screen colander nexted inside a stainless steel bowl. It seems
that if there were to be a stone, it would be on the bottom of the
colander, under most of the roasted beans. I should pay more attention
at the point when I am dumping the beans (half a pound or a pound of
greens at a time) from the colander.
Brian
On Thu, Jan 22, 2009 at 2:02 PM, David Martin  wrote:
<Snip>
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11) From: Allon Stern
On Jan 22, 2009, at 2:07 PM, Brian Kamnetz wrote:
<Snip>
Interesting - I roast the exact same way - a screen colander nested  
inside an aluminum pot from a defunct rice steamer, which I put in a  
large metal mixing bowl right in my lap. It's great hovering over the  
roast, looking at it closely, and shaking the beans to agitate them  
rather than stirring them (the colander, really a fry basket, I  
think) has a long handle.
-
allon
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12) From: Brian Kamnetz
My heat gun weighs nearly 4 pounds, so I suspend it from a tripod. I
set the stainless steel mixing bowl (with the colander nested inside)
on the floor of my screen porch. The bowl doesn't seem to get overly
hot (though I wouldn't want it in my lap). The only time something bad
happened from the heat is once when the mixing bowl was right on top
of a knot, and sap seeped out of the knot during the roast.
Brian
On Thu, Jan 22, 2009 at 10:02 PM, Allon Stern  wrote:
<Snip>
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13) From: Michael Wade
Only once, several years ago, and it was my Solis Maestro that found it. 
The stone was about the size of an early pea and fortunately it stopped the 
grinder burrs cold by jamming in the spiral cuts above the actual burr 
surfaces rather than breaking up and going through the burrs.  There is a 
detent clutch in the Maestro, and it will slip if this sort of thing 
happens.  Sounds like a screw gun when it reaches the clutch setting.
No obvious harm was done, but I ordered and installed a new set of burrs 
anyway since they only cost around $20.  I'm still using the same grinder 
(but not the same burrs), so they're pretty durable, in my experience.
I checked beans diligently for quite a while but eventually slacked off. 
Since I brew exclusively with an AP now, and weigh the beans out in a fairly 
large scale bowl, its pretty likely that I would notice anything not 
beanish.  Then again, there are mornings...
Michael Wade


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