kozelek Senior Member Joined: 29 Jan 2010 Posts: 4 Location: Amoy CN Expertise: I love coffee
Espresso: Miss Silvia Grinder: Rocky Vac Pot: No Drip: V60 Roaster: No
Posted Tue Oct 19, 2010, 8:08am Subject: Re: Rancilio Rocky problem
My first reply here.
I got the same problems,
exactly "anything above the zero pointómeaning anything that doesn't make the contacting burrs noiseóis not really as fine as it should be for a proper espresso shot - it isn't coarse, but it is not powder."
I think the problem is the two burrs were not parallel, gonna try with the tape.
It is a 2nd hand Rocky too. If this can not solve seems I will have to replace the burrs.
And I just wonder why not make the two bases with copper? I mean the base of the burrs, you know, the upper base is copper, but the other one is made of AL or something?
The upper burr carrier is made out of a solid billet of machined brass.
I am not the only one whose Rocky has problem here, seems there's a batch of Rocky have defects?
Yes, as I was saying on my other linked post with the picture of the dail gauge indicator., there's quite a bit of slop/play in the thread clearance between the lower receiver housing (Aluminum) & the top upper burr carrier. Teflon tape will help a lot.
Those burrs are certainly not a Rancilio OEM burr set (please look at the Rancilio logo above), looks like some aftermarket no name brand & not designed for the Rocky. I'd ventue a guess & say that's 100% of your problem, & the crack & probably warped trueness of the burrs. You can check this by laying the burrs on a small mirror & look for warpage. Shining a small light down through the center on the burrs would reveal any warpage by the light visually escaping from underneath the flat milled circumference & you'd see it.
Enlarge the pic, do you see it?
Yes, I see it.
I'd definitely replace the burrs with a stock OEM set of Rancilio burrs!
JLLG Senior Member Joined: 10 Mar 2013 Posts: 1 Location: Fenton Expertise: I love coffee
Espresso: Miss Silvia Grinder: Rocky
Posted Sun Mar 10, 2013, 10:50am Subject: Re: Rancilio Rocky problem
Hi All, This is my first post. I have decided to reply to an existing thread that is relevant to my current issue, at least to the best of my deduction. I purchased a Rocky doserless back in mid-2007. The plan was to invest in a good burr grinder then and eventually get an espresso machine later. I just purchased a Miss Silvia from WLL about 2 weeks ago. Up until this, the Rocky has been only grinding for press pot, +25 and up setting. I have been looking forward to home espresso for quite some time but am really frustrated at this point. In short, I have deduced that the Rocky burrs are not parallel and I canít produce a fine enough grind to choke the Silvia. My main issue with shots is they are coming to fast and I have no room in grinder to adjust smaller. I donít have a gram scale but I am trying my best to keep my dosing and tamping consistent while I adjust the grind. I have heard that the Rocky can produce a powder grind and also should easily choke the Silvia. I canít do either. I have come close by overdosing the double basket (only things I have been using) and extra heavy tamp. Still didnít chock it completely. I have thought about the pressure being too high but since machine is new, actually ďrefurbishedĒ from WLL, I am assuming this was double checked (maybe bad assumption). To be honest, I could not even tell machine was used if that means anything. So after a few days of experimenting and research, I figured I just needed new burrs. I got those and the only appreciable difference is my zero point is different, which actually means nothing. In practical usage, my shot times are essentially the same. So as a last resort, I have done the marker test. Marked the top burr flats and made the burrs touch. Removed to check how even the wear marks are. I did this with both burr sets and the touch point was in the same area of the upper carrier. In my opinion, I have a problem with burrs not being parallel and itís not the burrs themselves. Forgot to mention, I did these test with Teflon tape and my fingers are sore from all hard turning  Itís one or some combination of the motor, upper carrier, upper carrier sleeve (threads), lower carrier alignment. It seems I have bad grinder and I am not sure itís even repairable. Every reference I have found online just states to return it. That is not an option for me since its 6 years old. Has anyone been able to get this issue corrected when new burrs donít solve it? What are costs associated with this type of repair? Is it even repairable? I am really disgusted with Rancilio, almost making me not want to keep the Silvia. For now, I put the old burrs back in and at +1, finest setting, both burrs yield very similar shot times. I feel like I already wasted money on new burrs. Thanks in advance for any advice and help.
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