HomeRoast Digest


Topic: Results of Rocky burr experiment (7 msgs / 206 lines)
1) From: Frank Parth
I finally got around to replacing the burrs on my Rocky. The idea came from a discussion by the group three weeks ago. 
Even though I only have 50-60 pounds through the Rocky I was curious to see if replacing the burrs made a difference 
and I promised to do that and report back to the group on my results.  Out of curiosity I ground a little and looked at 
it through a large magnifying lens. I was surprised to see how much variation there was in the size of the grounds.
So I ordered a new set of burrs through EspressoParts.com as well as a set of the screws. After replacing the screws I 
don't think I needed to spend the money on them, they're pretty sturdy and were in perfect shape.
The replacement itself was very easy. I've posted pictures on my site athttp://www.fparth.com/rocky_burrs/.The first 
picture shows the old burr (on the left) and the new burr (on the right). The new burrs were finished very roughon the 
tips compared to the old burrs which were much more shiny. This surprised me. I would have thought the new burrs would 
not be so rough. The next picture is a closer view of the new burr and you can see the roughness at the bottom on the 
tips of the burrs.
The third picture is the bottom burr assembly before I took out the burr. The next pictures are of the top burr 
assembly.
I also took pictures of the grinds after the burr replacement. They're much more consistent in size. I had a cup of 
coffee before I replaced the burrs and then made another pot afterwards. I'm not any kind of a supertaster, but thepot 
made afterwards had a noticeably different taste. It didn't have the slight bitterness the first pot did. So even after 
only 50-60 pounds the new burrs were worthwhile. I may just automatically replace them every year from now on.
One of the things that has always really bothered me about the Rocky is that the measuring tape was not set on zero. 
I've heard many people on this forum talk about what setting they use above the point where the burrs touch. On mine, 
theburrs touched when the tape was at the ten marker. Maybe I'm anal, but all of my graduate physics classes taught me 
tomeasure a little more precisely than that.
So I also ordered a new measuring tape. After I put everything back together I found out exactly where the burrs 
touchedwhen the Rocky was turned on, marked that on the container, and then replaced the old tape with the new one. Now 
my burrs touch exactly at zero and I feel much better.
I also replaced the front switch with the same switch that turns it on and off. Now I don't have to hold the switch 
downto grind, I just turn it on (this required removing the base plate, but that was easy).
Frank Parth
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2) From: Sandy Andina
I have both a Rocky and a Mazzer Mini.  The former did not track  
exactly with the numbers on the tape (something that many have  
confirmed--every Rocky is unique in that regard) and the latter is  
calibrated at the factory with the sticker set to what seemed to be  
optimal, the consistent results which my cup repeatedly confirms.   
After disassembling both for cleaning and reassembling, the Rocky  
needed to be recalibrated along a wider spectrum than did the Mazzer-- 
in fact the Mazzer seemed to "dial in" pretty much the same each time,  
given identical beans.  My results are strictly for espresso, however,  
so YMMV.
On Sep 6, 2008, at 6:09 PM, Frank Parth wrote:
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(snip)
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Sandy Andina
www.myspace.com/sandyandina
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3) From: Barry Luterman
It is not necessary to remove the base plate to replace the switch.
Simply use a flat blade screw driver with a thin rag wrapped around it
. The rag is to insure you don't mar the surface of the grinder. The
old switch will pop out easily and the three wires can be disconnected
from the old switch and put on the new switch. Then the new assembly
just pops into the face of the grinder.
On Sat, Sep 6, 2008 at 1:09 PM, Frank Parth  wrote:
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4) From: miKe mcKoffee
<Snip>
 So even after 
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Yup, my Rocky got it's 5th annual burr replacement this year. Hosting five
of six PNWG made remembering "when" to replace easy, just before the next
Gathering so Rocky was at his best:-) And FWIW still using the original 3
lower burr screws.
Kona Kurmudgeon miKe mcKoffee
www.mcKonaKoffee.com
URL 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.
Pacific Northwest Gathering VIIhttp://themeyers.org/HomeRoast/Homeroast mailing list">http://home.comcast.net/~mckona/PNWGVII.htmSweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/Homeroast mailing list
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5) From: Frank Parth
<Snip>
Barry,
I tried that. removing the base plate was a) a last resort, and b) very easy.
The problem I ran into was that the two (not three) wires were so short they kept pulling back into the base. Therewas 
no way to get a grip on them and plug them into the switch.
I probably have a different model Rocky than you do and the innards are slightly different.
Frank Parth
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6) From: Elliott H. O'Reilly
Usually I come out of lurking to thank Tom for the marvelous coffees that he
continues to provide to us, which is always justifiable.  Now I want to
thank of you for initiating the various discussions about grinder burr
replacement.  I am a foolish human as my 3 dogs will gladly attest.  A
little over 4 years ago after mention by Ed Needham I happened to pay Barry
at Riley's Coffee & Fudge a visit.  While there I ran face to face with a
new Rocky and said "I gotta get me one of those"!  Luckily my wife has never
asked me what it cost!  Three days later the Solis Mulino I had been using
met a stone in some Yemen Mokha that it didn't like and spit out a number of
teeth from its main drive gear.  This Rocky was such a mighty machine
compared to that little Solis that burr replacement never crossed my mind,
that is until the recent discussions.  I guess because of the slow
degradation I really wasn't cognizant of the changes in my coffee though
something did not seem quite right.  But with your help I got smart, ordered
and changed my burrs.  While I did not get smart enough to order extra
screws, I did use a new Phillips bit in my multi-tip screwdriver to help
ensure that I did not strip the screws.  The whole process was fairly quick,
easy and uneventful.  My burrs now touch at 5 below zero.  While my
observations are strictly anecdotal rather than scientific, my naked eye
(with normal vision correction) can perceive a noticeable improvement in the
grind consistency.  The speed of the grind and the flavor of the coffee have
definitely improved.  I'd like to thank you again for making me so aware of
my ignorance, and helping me put an end to the pain and suffering that I was
inflicting on these most wonderful coffees!
Elliott O'Reilly

7) From: Brian Kamnetz
Elliott,
Thanks for describing your experience. I'd be interested in hearing
about any difference you notice in the cup. (A few years ago I
switched from a whirly-blade grinder to a Zassenhaus 169DG and was
amazed at the difference, so I always enjoy hearing about the grinder
experiences of other home roasters.)
Brian
On Mon, Sep 8, 2008 at 12:42 PM, Elliott H. O'Reilly  wrote:
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