Small burr is relative, grinding area is the same as of a 64mm flat burr.
Only that it is rolled in the form of a cone.

^ renatoa is right on the money with the size comment
cone burrs were invented to make burrs more compact and to reduce the torque load on the motor/crank.

Are you guys, that are having trouble with bean not falling down the grinder doing RDT inside the grinder itself or in another cup like the catcher?
I do my RDT in the catcher and never had a problem with beans sticking, but I've heard this from enough of you now, that I think it's a problem that I may be able to address in V2.0, just trying to find the source of it.

I RDT in a separate cup before pouring the beans into the Arco.

boren wrote:Can a blower be used to reduce retention (instead of slapping or tapping the grinder)?

I tap it lightly on a tamping mat or towel, i think this is fine so long as it is not done too forcefully.

Still loving this grinder, I've been using it way more than the weber key.

@ugen - based on the fact that the Weber Key costs 4 times as much as the Arco I'd expect it to be better in almost every way except for size and the manual grinder option. What makes you prefer the Arco?

I think a lot of my fondness for the Arco is just that I enjoy hand grinding. I still have not compared the coffee from the grinders side by side but I feel that they both do a good job, I have not had any problems with the Key.

PeterTheGoat wrote:^ renatoa is right on the money with the size comment
cone burrs were invented to make burrs more compact and to reduce the torque load on the motor/crank.

Are you guys, that are having trouble with bean not falling down the grinder doing RDT inside the grinder itself or in another cup like the catcher?
I do my RDT in the catcher and never had a problem with beans sticking, but I've heard this from enough of you now, that I think it's a problem that I may be able to address in V2.0, just trying to find the source of it.

I RDT in a separate cup, but I've had it happen even if I don't RDT

LObin wrote: <snip> I just received my Arco this week (backer #2784) and I'm rather pleased. The grinder feels solid, the workflow is great, static is minimal and with a few knocks, you get 0 to 0.1g dose consistency. Will look for a bellows to avoid knocking the base on the counter every time.(previously with MP and Italmill)

Jonathan, did you find a bellows that works with the Arco?

Goat, look below what vox populis commend
See that taper between the body wall and the outer burrs ?

spressomon wrote:Jonathan, did you find a bellows that works with the Arco?

I totally forgot about it! Although I'm now questioning if it would really dislodge the grounds that gather at the burr exit. Static seems to be the culprit.
I use a little brush to clean this. A blower for camera lenses doesn't do it.