Hi all, I have a second-hand rocky/silvia combo and am having trouble getting a decent pour lately. The latest issue is the grinder. I get fresh coffee, like anywhere from 3-7 days from roast, and I cant grind fine enough to get anything more than a 20 second pour, even when overdosing the double basket to around 18g and tamping hard! And 20 is the upper end.
You should be able to adjust the grind down to much finer than required, generally indicated by the resulting ground coffee "balling" up ie falling into your coffee filter (if its a doserless model grinder) in sticky balls. The pump cant pump through this once it has been dosed properly and tamped down. So if you cant get grinds this fine maybe someone has had a fiddle with the adjusting mechanism of the grinder and it wont adjust down far enough.
Ive addressed the basics of fresh beans, tamping pressure and dosage, so Im sure its not that.
With silvia you need to dose so that the level of tamped grounds is at just the top of the groove that goes around the filter basket about 6 or 7 mm below the rim......otherwise it is not enough
Ive also noticed husks coming in the grind, which looks bad. The grind itself isnt as fine as it used to look, and looks different tamped down. (I can see the tamped dry puck looks more granular than it did six months ago).
All of this simply indicates that the grind is too coarse.
I cleaned rocky out and reset the zero this morning, and its no better. Im pretty sure I set put the burrs in correctly and that its all as it should be.
See my first note above, you should be able to adjust the grinder down till the resulting grinds are too fine. If not then this is the cause of the problem
Before you say Just set it finer!, I WOULD, except any notches finer than 6 on my particular machine as it currently is (with zero as the definite touching point), and I hear the distinctive chip chip chip of metal on metal. Something that worries me is that its a chip chip chip i.e. pulsing sound, which means something may be uneven. In fact, if I touch the hopper slightly as its making this sound (I have only done this once or twice), the sound goes away.
Very hard to comment unless one has the grinder in front of oneself. And you have told us have been in there so I for one cant comment.......can you be sure you reassembled correctly........
Ive had the grinder for 6 months, during which period Ive bought processed maybe 5kg of beans. Before this the previous owner said he made about a double a day for the two years he owned it, which equates to around 15kg of beans, give or take. So It has done 20kg in total.
They should be good for about 400 kilos or more depending on the type of blends used.
Is it time for new burrs from coffeeparts? Or something else?
Given your descriptions, nothing to do with bluntness / sharpness of grinding plates (burrs), possibly something to do with the assembly of the top plate carrier. Or, if someone has had the grinding plate right off the carrier, make sure there was no grit under the plate when it was screwed back on as this will cause the plate to sit eccentrically instead of true.......
Also, dont rule out the blend of coffee itself.
Try a different blend or a compltely differenty source of beans and see what happens, although the most obvious thing that comes to mind given the symptoms you describe, is inability to set correct grind so would be looking there first
Hope this helps,