HomeRoast Digest


Topic: Rocky isn't grinding right (4 msgs / 64 lines)
1) From: Jack M. Bernstein
My Rancilio Rocky, which is probably 5+ years old was not grinding right.
Coffee was coming out too coarse. I assumed that it was the burrs and
purchased replacements which were then substituted for the originals.
Strangely, even with burrs almost touching each other, I am still getting a
coarse grind. Any ideas? Are the burrs misaligned? Thanks.
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2) From: Jim Gundlach
Can you check to see if the burrs are exactly evenly spaced all the  
way around?  Since changing the burrs did not fix the problem,  
assuming you have the new burrs properly installed, it may well be a  
bearing or bent shaft problem.  My guess is that it is the latter  
because changing the burrs did not change the grind.
      pecan jim
On Sep 3, 2009, at 7:58 PM, Jack M. Bernstein wrote:
<Snip>
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3) From: Allon Stern
On Sep 4, 2009, at 12:58 PM, Jim Gundlach wrote:
<Snip>
Here's an idea...get some of the carbon-paper-like stuff dentists use  
to check your bite, put it on the lower burr, then adjust until the  
burrs touch. Then remove the upper burr and look for any non-marked  
points.
That may at least tell you something.
-
allon
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4) From: Bob Hazen
I don't know about Rocky, but other grinders I've been into are probably 
similar.  I've noticed that there's a certain amount of gooey crud that 
builds up around the burrs where they interface to their carriers.  If you 
fail to get that surface clean and some of the stuff winds up under the 
burrs, they won't seat properly.  Also, if your replacement burrs are 
slightly larger in diameter and you don't clean off that ridge of goo they 
won't seat correctly.  This may lead to non-parallel burrs and the obvious 
troubles.
Bob
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