Change in Conical Burrs for Mazzer Robur

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Change in Conical Burrs for Mazzer Robur

Postby markpfaff on Wed Sep 02, 2009 5:18 pm

Hey all,
I've had some strange run ins with conical burrs for our mazzer roburs lately. We had a timing mod on one robur so we know how long it should take to grind our 21 gram dose - it's about 5.6 sec or so on fresh burrs. I got one set of new burrs from a place down in cali and they >started off< at 7 sec then dulled to almost 10 seconds in one week. I sent them back and the company told me I'd put the burrs in upside down....really? That would be a serious feat if someone could manage to get them in backwards :) Anyways..

I ordered 2 more from Franke and...same thing! I was working on a different robur at a different cafe (no timer mod) and the new Franke burrs ground a chute-full of coffee in 18 seconds while my old (dull) burrs grind it within about 12 seconds?? (by 'chute-full' I mean if you close the hopper slide and just grind whats in the space between the burrs & slide.)

They are all single phase burrs and the cut on the burrs does seem different but only slightly. I switched them out multiple times to compare and time each set of burrs and also on different grinders. I also marked each set to make sure I remembered which is which. Talk about time-consuming! There's a definite difference.

It's not power because there's a difference between the burrs when I switched them out on the same grinder plugged into the same wall outlet.

I'm taking the sets of burrs I have down to La Marzocco tomorrow to compare them to what they have. The guys said there was a change in production but that was a year+ ago.
This drastic change in speed would be a serious problem for our cafes. If anyone else has experienced this or has any ideas I'd greatly appreciate hearing them.

Thanks

Mark P
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