Grinding discs
The grinder has two precisely machined grinding discs that produce a
uniform grind. The discs are arranged with the cutting blades facing
each other, in which the distance between the discs determines the
texture of the grounds. The closer the discs, the finer the grounds.
The discs are mounted one
above the other, a lot closer
than shown here
The grinding discs in an Elektra
domestic coffee grinder
One disc is attached to an electric motor that rotates the disc. The
other disc does not rotate and is attached to an adjusting wheel that
allows the distance between the grinding discs to be altered.
Locking pin
notches. These
are located on
the underside of
the grinding
adjustment
wheel.
Fixed disc, which is
attached to the grinder
adjusting wheel
Rotating disc which is
attached to the motor
Because the grind texture adjustment is critical, the adjusting wheel
has locating notches, with a spring-loaded locating pin positioned so it
clicks into a notch. A scale around the adjusting wheel gives an
indication of the position of the wheel. Rotating the wheel changes the
distance between the grinding discs.
To rotate the wheel, hold the locating pin down and move the wheel
one notch position at a time. Rotating the wheel
clockwise
gives a
finer grind (because the discs are moved closer together). The grinder
must be off when changing the position of grind adjustment wheel.
Numbered
scale
Adjusting
wheel
Locating pin
down so the
wheel can
be adjusted
Locating pin
locking the
position of
the wheel
Locked
Unlocked
The grind adjustment wheel is held in position by a
locating pin. Hold the pin down to move the wheel.
Training manual – Grinders
9
