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Topic: air roast control >was Re: +Drum vs Air or is it more than that? (3 msgs / 96 lines)
1) From: miKe mcKoffee

2) From: Lee XOC
< miKe mcKoffee
< Sent: Wednesday, 18 June, 2003 10:34 AM
<
< Lee, I don't remember if you are FRm controlling both fan & heater
voltage
< or just fan. (no info' for yours on Ed's sight that I can
< find) Late in roast, usually somewhere in 1st crack, I'm switching
from
< increasing to decreasing heater voltage to keep it from running away.
Often
< simultaneously further decreasing fan so yes it's a tricky balance but
isn't
< really that difficult with experience, becomes second nature.
Sometimes I
< even toggle the heater off a couple seconds as a brake if I'm late
< decreasing heater voltage rather than increase high air flow beyond
what's
< needed for just barely bean movement... Just a technique thought to
muddy
< your waters further!
Yea I have separate controls for fan and heat.  The heat is controlled
with a KRM variac, and the fan with a homemade control box featuring a
150W rheostat (I have to post a pic of it sometime, I'm kinda proud of
it).
That's interesting about your decreasing heater voltage late in the
roast - I've found that if I let up on heat at all late in the roast,
even just a tad, it tends to make the temp drop too much.  I think I've
done it once or twice and it's been okay, but generally I just use the
air speed to regulate the temp at the end.
That said, my results are still largely hit or miss.  I haven't settled
into a repeatably successful roast profile yet by any means.
- - - - - - - - - - - - - - - - -
Lee / San Diego
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3) From: miKe mcKoffee


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