well good morning YouTube this is the grinder in my Breville barista Express and I've always
wondered how this grinder adjustment works there's this inner burr and then there's the
outer burr this one is fixed the center one and when you rotate this adjusting wheel so this is
your wheel over on the side that goes from one is fine up to 16 is coarse so as you rotate that
that rotates this big cog here watch right here the top of that burr you can see it becomes a
little bit more exposed this is full course and that's fully fine and this outside moves
up and down about six tenths of a millimeter so it's really tiny amount without adjusts
how much space there is between this fixed burr in the middle and then this conical burr on the
outside and I guess because that conical burr is tapered as you move it up and down the distance
between the two burrs changes if you look way down there the little gap at the bottom you can
see how it's really small there and it's bigger it's not much of a change but there's the coarse
spiral flutes on there but at the very bottom of that fixed burr there's little tiny teeth
and that there's also a little tiny teeth on this conical burr and it's that gap right at the bottom
you can just barely see like right where the tip of the pointer is down there there's that
slight gap and it gets a little narrower and a little wider and then I guess you've got
the motor and the drive are right in here it's this fixed burr that spins and then this outer
part moves up and down looks like these are three equally spaced marks this thread right
here is probably two millimeter thread pitch and you do about a third of a rotation so you
get about six tenths of a millimeter there I've had quite a few comments or questions
from viewers and they'll ask things like oh I've got Starbucks such-and-such coffee what number do
I set it to even though this is pretty precise these numbers aren't really calibrated to any
particular thing they're not 12 micron 14 you know these aren't aren't calibrated units they're just
relative numbers and it just adjust that gaps asking somebody what number they use on their
machine so that you can set yours on your machine as is pointless because you have to find out what
grind setting works on your machine with your coffee and that may be totally different than
what works on someone else's machine there's no micrometer in here that tells you exactly what's
going on there is supposedly an adjustment you can make compensate for where in the grinder and
I think the idea is that is the grinder where's the coffee will get coarser and coarser but
there's an adjustment you can make to tighten it back up again my intent is going the other
way it's getting to where I have to run coarser and coarser setting to get the same fineness so
I'm not sure what's going on there but anyway I thought it show you how that grinder works
inside at least the adjustment mechanism anyway I've got to put this machine back together just
thought I'd show you what it looked like inside on the grinder adjustment and yeah if you have
any questions about that post up in the comment section below so I'll put some of the grinder
adjusting and cleaning videos over here on the left side and as always thanks for watching