Re: Rancilio Rocky burrs
Calibration on my Rocky grinder appears to be accurate.
Heres how mine it is set up:
With the plastic hopper removed and adjusting the burrs slowly by hand where the burrs just touch lightly this corresponds to MINUS one small division.
Backing off the burrs slightly so the motor is free to turn and no mechanical inteference sound is actually the ZERO point
The zero point is set using a fairly crude self tapper in the hopper "bent" (by the factory) to limit the burr adjustment and eliminate mechanical interference.
This measure is presumably done to avoid the potential damage that could result from a novice running the machine on or too near to "true zero" where burrs come in contact.
In essence the MINUS ONE small division setting provides good insurance.
I hope this helps!
Calibration on my Rocky grinder appears to be accurate.
Heres how mine it is set up:
With the plastic hopper removed and adjusting the burrs slowly by hand where the burrs just touch lightly this corresponds to MINUS one small division.
Backing off the burrs slightly so the motor is free to turn and no mechanical inteference sound is actually the ZERO point
The zero point is set using a fairly crude self tapper in the hopper "bent" (by the factory) to limit the burr adjustment and eliminate mechanical interference.
This measure is presumably done to avoid the potential damage that could result from a novice running the machine on or too near to "true zero" where burrs come in contact.
In essence the MINUS ONE small division setting provides good insurance.
I hope this helps!

but flat burr-plates have a polished mating surface at their periphery that will slide over each other.

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