by mteahan on Wed Apr 26, 2006 9:07 pm
The tooling cost for the ceramic burrs were north of $50, though the production cost of them were actually less.
Mills are cut, and almost no one makes their own burrs, not even Mazzer. Pitch, angle, design and diameter are a function of motor speed, torque and capacitors used, design is NOT for the newbie and is an artform all to itself.
Material composition can be a big factor in lifespan as well, and you can also get many mill in a titanium version to double (triple?) the life span, though the cost of the treatment is more than the cost to regularly replace the mills.
Though ceramics are supposed to last much longer--they do not last forever. They are also brittle and can shatter when dropped, tightened with a bit of coffee under the rim or when a small stone or nail enters the throat. A traditional mill may process the object without much effect, slightly reducing the lifespan. Ceramics, on the other hand, may simply pop.
Besides, ceramic is tough to engineer due to shrinkage and composition. A 64mm mill may have to start at 67mm. Hard to say, depending upon the materials.
Change your mills and keep them clean.
Michael
Michael Teahan
Espresso Part Source