Mazzer Robur uneven grinds?

[TC]

Don't grind rice.

It will settle once you see about 2k shots...

[skidquinn]

Quick update. New burrs installed, but am still having issues.
I had read that Robus burrs can take a period of 'breaking in' so I kept a look out for the finish on the burrs before installing...... Even to the naked eye I could see the rough finish.....
Anyway, installed burrs and its grinding super slow (for a Robur) and still pulling pretty ordinary shots.

Anyone tried the white rice through the grinder to break these in? If I had to do that with coffee beans, it would take me years.

[kesa32]

yep sounds like new burrs are in order,,,,, maybe too , you ground a stone etc that was in the beans ? who knows

[skidquinn]

Thanks chokkidog! As I suspected..... Makes you wonder why they don't add another digit or two to the counter to make it actually useful.
Will order some new burrs!!!

[chokkidog]

A café with a Robur-e is likely ( but not, of course, certain) to go through 20kgs + per week.

Burrs would need replacing every 10 months at that rate. Proportionately less for higher coffee consumption.

And at 80kgs/week..... do the sums.

The shot counter only goes to 9999.

It tells the truth...... but only if you know the lie! ;-)

[skidquinn]

Hi all
Relatively new here and hoping for some advice regarding a Mazzer Robur E and an issue I seem to be having with uneven grinds. I picked up the Robur through my brother a number of months ago for a price that was too good to resist. It had been used in a commercial environment and has ~ 7000 on the counter. I think year of manufacture is 2010. When I purchased it, it had a sticker on it indicating that the burrs were changed in May 2013.
My previous grinder was a Gino Rossi RR45 (which I believe appear rebranded as numerous other brands) and at first, the Robur seemed to produce much better coffee in the cup than I could manage with the Gino Rossi.
Over the last few weeks I think I've noticed that there are very very small bits or chunks after grinding through the Robur. The quality of the espresso has been pretty ordinary as well and I can't seem to get a shot on the bottomless portafilter that doesn't shoot everywhere at first, and then blonde far too quickly.
To make sure I wasn't going mad, I've fired up the Gino Rossi again to compare and have no such issues. The coffee is great.
I am using home roasted beans which are no more than a week old, so should be no issue there.

My guess is that I need to replace the burrs, but have read that Robur burrs should last anywhere up to 800kgs of beans? The counter suggests (unless its been round the clock completely...... maybe multiple times??), that it hasn't had that volume through it? Should I just replace them anyway? Are burrs from 2013 considered old?
Are there any other reasons why this would happen? And why its only happened since I bought it?
I have pulled it apart again and given it a good clean (burrs and all) but this hasn't helped.
Realise its hard to make a call without knowing volumes through it though.....

Any thoughts?
On a side note, it is such a beast of a thing, I'm still deciding whether I will keep it long term. My wife thinks I'm completely mad, but has been surprisingly tolerant with my new obsession!!

Thanks