Rocky needs adjustment?
When grinding on my usual adjustment ("6") this morning, I noted that there seemed to be an intermittent contact of the burrs.
By "contact" I mean the buzzing sound & vibration that suggests burrs coming into contact with each other.
I have never had this issue before, and am wondering if it means that something has worked loose or worked out of adjustment.
The Rocky is several years old (although only used a few times a week) and has never been serviced.
While 'investigating' this matter, I also noted that the hopper will turn only to about '4' on the dial which surprised me as I have never tried to adjust it less than '6' and just assumed it would adjust back to '0' - so maybe this is evidence of it having worked itself out of adjustment ??
Any advice from other Rocky users?
I have not watched the Youtube video mentioned in the Sticky yet as thought I would solicit a bit of early advice before getting into time consuming research on the matter.
Sounds a bit like a rock..
That's "Rocky" to you Mr Jack.
... is stuck in your grinder.
HOLD THE PRESSES!
Being naturally impatient, I had a look at the various references to 'Cleaning the Rocky' at the start of this Section and realised that a clean allowed a good look at the burrs and should reveal any problems.
I just spent the last two hours giving the old girl a good clean (it was very dirty) and upon reassembly it appeared that Zero point would be '3'.
(I was fascinated by the 'precision approach' to manufacture represented by the bent screw.)
However to my surprise, when called upon, the hopper rotated to stop exactly on Zero.
Precision bent screw!
Now all I need to see is whether there are any problems when I grind tomorrow. I'm thinking not.
Ouch. Hopefully an easy fix.
Well there is definitely something not right here.
After the thorough clean/refit and adjustment to 'true zero' I still have contact between the burrs at various settings up '10' .
Above '10' there was virtually no contact but of course this was a very coarse grind.
It's not just a case of using a bigger number for the same grind as above '10' is very coarse and unsuitable for an espresso machine.
Any thoughts from the experts?
I s'pose you've checked that the burr-set is still tightly secured on the carriers?
Is the sound a continuous noise or coincident with each revolution of the rotor, i.e. a 'High Spot'?
Is there any noticeable "End Play" of the Rotor Shaft? A very small amount is Ok but anything much more than 0.015" is unnecessary and may indicate an issue with the Rotor Thrust Control arrangement. I can't remember how this is achieved on the Rocky I'm sorry...
your post suggested to me that I need to clear my mind of assumptions (one of my biggest faults) and just observe what is there.
(everything appeared to be nice and tight w/o any undue Rotor 'slop' or uneven burr contact)
There is intermittent contact at the settings I have been accustomed to use - '6' for single basket, '8' for double.
On closer observation this morning, '8' was producing a finer grind than I was expecting so I went up to '11' which was actually more like the degree of coarseness I was expecting AND no burr contact.
It appears that post-clean & adjustment that maybe the 'old' 8 setting is now '11'.
I am not sure why this would be the case but the new setting produced a great pour and fantastic cup using Andy's Harrar Longberry.
I will try just increasing my grind settings by about 4 and see how that goes.
Sounds good Rocky....
Just goes to show how important it is to ignore the numbers and simply go with the quality in the cup. I never look at the numbers on my grinder, just adjust either way to suit the pour from my machine. Keeps everything simple that way...
Hi Rocky I have cleaned my grinder ( a Rocky) a number of times now and each time before I replace the hopper I hold the top burr assembly and rotate it (with the grinder running) until I hear the first sounds of metal to metal (best described as a "Chirping" sound) This is your true Zero point. Now attach your hopper and what ever number is aligned to the marker this will be your zero. Never grind or adjust below this mark. If you are hearing chirpy sounds well above, or in fact anywhere above this mark, I think you have a problem. I have a Silvia and find I am always grinding less than 4 marks above my true zero. I have also made mine stepless by adding some plastic hose. I have found this invaluable in obtaining the correct grind for my Silvia.
Thanks Cicarda, your comments make sense. On reflection, I think when I re-mounted the Hopper the setting was "3" so in other words "3" is my 'True Zero".
This maybe explains why I need to add 3 or 4 to my previously used settings. (?)
Anyhow I will experiment a bit more.