HomeRoast Digest


Topic: Rocky burr replacement (9 msgs / 191 lines)
1) From: Vicki Smith
I just ordered another set of burrs for my Rocky. I've been replacing 
them every 100 pounds or so having seen recommendations for 75-100 
pounds when grinding for espresso.
The deal is, very little of my grinding is for espresso--perhaps 5%.
This leads me to a question. If I am not grinding for espresso very 
much, does that mean my burrs should last longer for any grinding I 
happen to do, or does it mean that after 100 pounds or so, I still 
should be replacing the burrs because they won't be *good enough* for 
espresso grinding, though still OK for coarser grinds.
Anyone want to suggest change rates for non-espresso use (mostly in the 
area of true zero plus 20 and even coarser for FP).
vicki
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2) From: miKe mcKoffee
Good question(s) with logical answer. When grinding coarser burrs do less
actual grinding for a given volume of beans and hence the burr cutting edges
will not do as many cuts and hence stay sharper/last longer. How much
longer? Don't know but seems simple to calculate. First let's say 75# is
optimal change frequency grinding for spro. Grind X weight of a bean for
spro and time it. Next grind X weight of same bean for your usual coarse
grind and time it. Now divide coarse time by spro time and mulitply by 75.
That should give you a good guessitmate of needed burr replacement
frequency.
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
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3) From: Vicki Smith
Thanks Mike. This would not be a big deal, but this last set of burrs 
cost me $82 CAD including postage, and that kind of thing sure adds up 
over time.
v
miKe mcKoffee wrote:
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4) From: Joseph Robertson
Vicki,
I have a La SanMarco grinder for home all around use. I found it used for a
decent price and immediately started asking questions like yours.
I suspected by the performance that the burrs had never been replaced. I
contacted a ( I think ) Seattle based company to see if they could get burrs
for me and how long they should last. I believe they were going for
somewhere between 60 and 75 USD. He told me in an email that for general all
around home use that new burrs should last me the rest of my life. After
getting to know MiKe M. and others here on this list I know that for the
quality of coffee I'm looking for that ( the rest of my lifetime) is a huge
stretch.
I was lucky to find out that the company that sold me the grinder included
new burrs with the purchase so all I had to do was call him and he had new
ones mailed to me. What a big difference it makes. This grinder was a 1986
model. Still runs and looks great on my home counter.
I think MiKe's approach to grinder burr fatigue is a great way to get some
numbers on age and wear.
JoeR
On 4/6/08, Vicki Smith  wrote:
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5) From: Larry English
I replaced my Rocky burrs after 125 and 150 lb and the difference was
amazing.  I had ground for espresso a few times at the beginning of Rocky's
life but hadn't in a long time.  Comparing the old burrs with the new
convinced me it was time - the old ones were pretty dull, comparatively.
The new burrs produced much more even grinds, which made quite a difference
in the cup, especially in French Press brews.  I intend to replace every 100
lb or so from now on.
By the way, the prices quoted in these messages seem very high - mine were
under $50 including shipping.  Google helped a lot in finding good prices.
Larry
On Sun, Apr 6, 2008 at 11:15 AM, Joseph Robertson 
wrote:
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6) From: Joseph Robertson
Larry,
I think my memory is failing me. I should not have quoted at all. Now that I
think back I believe the price was around 50.
Replacing burrs should be the first move when picking up a used grinder. I
wish I had got them changed out sooner now that I seen the difference.
JoeR
On Sun, Apr 6, 2008 at 6:09 PM, Larry English 
wrote:
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7) From: K W Matley
This was one of the first posts I read when I returned to the list 
after a long (2 years+) absence. I have been using my Rocky for about 5 
years. I grind mostly for myself, so I estimate I've put about 50 lbs. 
per year on it. I had given no thought at all to replacing the burrs 
until I read this post, but after reading it and the responses, it 
seemed pretty likely that it was time to reburr the machine. Ordered 
new burrs that arrived yesterday. I installed them and did the first 
grind this morning. Wow! The Rocky is much quieter, faster, and the Vac 
brew I made this morning is much clearer. Could this be why my Chemex 
started stalling on me? Or why my French press cups started having too 
much body? 
I was trying to draw some profound conclusion to deflect my 
embarrassment at letting things go for so long but I think I'll just go 
ahead and be embarrassed--and thankful that Vicki brought my attention 
to this!
Ken
On Sun, 06 Apr 2008 10:18:53 -0600, Vicki Smith wrote:
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8) From: Rich
Dull burrs make a lot of fines and that leads directly to plugged vac 
pot filter, over extraction, and mud in the cup.
K W Matley wrote:
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9) From: Jim Gundlach
One of the nice things about this list is that it reminds us to take  
care of those things that we are inclined to let slide.  I tend to  
treat it like a spell checker, it lets me recover from my shortcomings  
without having to suffer the embarrassment of other people seeing my  
failings.
      pecan jim
On Apr 12, 2008, at 8:34 AM, K W Matley wrote:
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