Back up the bus. This is the second time I have seen burrs with braille like projections. What are those burrs? Why the unusual design? Who has used them? Comparison with the slant machined ones with which I am familiar. Thx.
What does it even matter if they are just going to end up warped?
Probably why these are so thick - to try to prevent warping. I can't tell if mine is warped yet - maybe it doesn't get hot enough in 4 seconds for my double. I will watch it closely though from now on...
You wouldn't necessarily see the difference if it was warped, unless you had an
absolutely flat surface and a set of fine feeler gauges. Besides warped burrs you also need to check for bearing run out that can cause burr wobble, flatness of the burr carrier, proper torque on the carrier nut, are the upper & lower burr carriers parallel, etc.
Espresso machines & grinders are priced so high because of the manufacturing precision that's
supposed to go into them. The best way to judge their quality is to listen to feedback from expert owners. Me, I get suspicious when I see a Mazzer SJ knock off from China, or any grinder with just two mounting screws.
editorializing: Good Chinese equipment is priced on par with good equipment made elsewhere (guess what, the Chinese manufacturers didn't just fall off the turnip truck; they price their goods to be competitive in world markets, not to give their stuff away). When I see stuff from 3rd world countries priced 75% below prevailing world prices for equal goods, I stay well clear. One can save a bundle buying these hand made, no support, no off-the-shelf spare parts, machines, but you just might be buying an expensive door stop.
