HomeRoast Digest


Topic: FR - slowing down the roast profile (58 lines)
1) From: Kevin DuPre
After having run 50 or so batches through my Fresh
Roast with the "stock profile", I did an experiment
last night with some Costa Rican Tarrazu (Diamante '02
lot) to determine the viability of making a
modification to my FR (the schematic was very easy to
derive, and as it turns out the motor runs off of 12
volts, dropped by a resistive heating element that
drops the line voltage to the motor).  My mod will
involve using a 10 amp relay to interrupt the heater
current momentarily in order to stall the roast at a
given temperature.  The power for the relay which
requires 12 volts at low current will be drawn off of
the motor power supply and switched through a 1/4"
phone jack into which I plug a musical instrument foot
switch to open and close the relay.  The relay will
have the heater power wired to its Normally Closed
contacts so that I can simply not use the footswitch
if I want to use the "stock" profile.
My roast involved letting the roaster come to 375 as
monitored by a dial thermometer in contact with the
tumbling beans, and then stalling the roast at 375 for
5 minutes by alternating between heat and cool while
watching the thermometer.  After 5 minutes the roast
was allowed to proceed to 1st crack which with this
roaster seems to be at 425.  At that point I stalled
the roast for 2 more minutes using a similar technique
at 425 and let it proceed to 2nd crack which for the
CR seems to be at 455-460. 10 seconds into rolling 2nd
crack, the roaster was switched to cool and the beans
cooled for 4 minutes before dumping into the cooling
pan.
We brewed some of that batch this morning and the
result was a little lower acidity and bite, smooth,
but with a more developed body and mouthfeel.
As a result of this, the mod to my FR will be going in
this week.  It's amazing what a difference a longer
profile makes!
=====
--
Kevin DuPre
obxwindsurfhttp://profiles.yahoo.com/obxwindsurf"The real voyage of discovery consists not in seeking new landscapes but in having new eyes -- Marcel Proust"
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