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Topic: Rosto roasting weight and time (16 msgs / 513 lines)
1) From: Jeff Faust
What much beans by weight do you Rosto roasters use?  If I use the
recommended weight, 115 grams, with the recommended roasting times, 8
minutes plus, I'll burn the coffee.  I either need to reduce the time or
reduce the weight.  At 100 grams, 10 minutes will give me quite a dark
roast.  At 115, I need to stop shortly after 6 minutes.
What's the better trade off?  Should I use less weight or less time?  Does
it matter?
An amusing story playing with this weight/time trade-off:  Before I got my
scale, I attempted using considerably less beans.  I also got side-tracked
and had to leave my roaster's side, something I rarely do.  I returned when
it was done to find exactly 6 beans left in the roaster.  I was momentarily
confused before I realized that all the other beans were in the chaff
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2) From: Jeff Faust - Home
"What much beans" ...
Sheesh.  English is my first language.  Really.
Anyway, I sent this out on Saturday, and it didn't hit the list until late
Sunday.  Does this have to do with how this list is moderated?  Is it
because it's the first time I sent from my home address?

3) From: Mike & Debi McGinnesss
From: "Jeff Faust" 
I roast 151gr 1/3# batches. Slow the roast by lower voltage via variac.
Off to play in Kona Kountry!
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4) From: Jeff Faust - Home
I've been warned that listening to you might adversely affect by wallet.
However, I just might have to get one of these--151g is pretty impressive!
On such a batch size, how long do you typically roast?  And what voltage do
you typically choose?  Does this produce a better roast or merely allow you
to roast more?
Thanks for your help and enjoy the trip!

5) From: DJ Garcia
I normally run ~ 150-155 grams, average around 9:15 mins for my darker
roasts (Full City plus to Vienna) and around 8:30 for lighter roasts
(Full City / light FC), Obviously there are variances, like the Peaberry
variations take a bit less. I do a little rocking to help, and I do get
some inconsistency in the lighter roasts, but they do come out delicious
:-). I take the inconsistency as a taste variation with its own charm
.... but then again, being pretty green (like my beans), take this with a
grain of coffee. I'm sure Rockin' Rosto Mike will have more interesting
and extensive reportage :-).
BTW, the Sumatra Iskandar Triple-Pick ... YUM!
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6) From: Jeff Faust
Thanks for the tips.  I'll try those weights and see what I get.  Are you
using a Variac?  What is "rocking".  As soon as I know that, I'll know the
meaning of Mike's signature!

7) From: R.N.Kyle
Jeff I do believe Mike McCoffee, uses a variac, and the rocking is =
necessary to get the 153grs. moving. He just rocks it back and forth for =
better bean movement. 
Mike and Debi are in Kona country, but I believe he is doing Email from =
there, Chime in Mike if I missed your Rocking Rosto variac roasting.
Ron Kyle
Anderson SC

8) From: R.N.Kyle
Sorry Mike I see now that you answered Jeff's question. I looked through =
the post and didn't see one from you. so I thought I might help Jeff =
out. after I sent it and the server checked for new mail 15 more post =
came and yours was among them..    Sunrises in Hawaii sounds sooo nice.
Ron Kyle
Anderson SC

9) From: Mike & Debi McGinnesss
From: "Jeff Faust - Home" 
I initially went with 151gr batch size because it would split a pound in three batches. Roast times
@ wall socket 120v were around 6:30 to 10 depending on darkness of roast. Early stages were somewhat
uneven so developed my technique of rocking the Rosto to aid been movement rather than reduce batch
size. I experimented with smaller and larger batch sizes. 1/4# greens did have better early movement
but with the rocking technique I get very even roasts so stuck with the larger batch. (I have done a
number of 1/2# batches but must be very careful in the rocking or will fill the chaff collector with
beans and greatly restrict air flow.)
I got into using the variac initially to slow the roast during the summer high ambient temp' roast
sessions. Or rather, maintain the roast times. After reading a lot on the list etc. decided to
experiment with lengthening the roast time emulating drum roast times. I found going too long
reduced the high note acidity too much for my tastes (over 15min or so) My most common profile is to
ramp to 380f in 6min, then 1min per 10f to 440f (6 min development stage) for my light full city
just before 2nd crack roast. The voltages required to accomplish this varies with ambient temp'. I
don't have my roast logs handy :-) but seldom even hit 120v. Roasting I did for this trip ambient
temp was 47f at the beginning of the 10 batch session. Max voltage was 115v as I recall. A 'set it
and forget it' approximate voltage for a 440f 12min roast at 70f ambient would be around 108-111v.
This also depends on the Rosto! I have two, one runs 10f hotter than the other. (I tested them no
bean to see how hot they'd go...) I use the cooler running one for around 60f and up ambient.
Extending the roast this way increases body and complexity without sacrificing acidity. Of course,
YMMV. Also, rest times are reduced for a great cup.
Gotta go, the pull of the Island is upon me!
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10) From: Jeff Faust - Home
Thanks for your help.  Mike did help me on the variac issue, although I
didn't know what "rocking" was.  I was expecting something a little more
technical than actually rocking the roaster back and forth ;)
Tonight (in about an hour) I'll try 151 grams while rocking.  Wish me luck!

11) From: DJ Garcia
No Variac for me - this coffee hobby is supposed to relax me, as I am a
tweak freak in everything else I do, and I'll be dawgonned and hogtied
if I let Rockin' Rosto Mike trick me into another tweaking frenzy :-).
On the other hand, I do find rocking the unit from side to side and even
shaking it to promote bean movement a rather soothing affair ...
Hey Mike, been to HI a couple of times, last time being last year to
Kauai. I do envy you right now :-)
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12) From: sho2go
Jeff, this takes a little practice.  The first time I did it I had a chaff
screen full of beans.  It seems to work better if you tilt (rock) away from
the screen.

13) From: Jeff Faust - Home
I did 151 grams while rocking.  I used a circular motion, and as you
mentioned, ended up with beans in the chaff collector, although really not
that many.  The beans look and smell great, although I haven't tried them
yet.  Next time I'll try away from the collector instead of all directions.

14) From: Mike & Debi McGinnesss
From: "sho2go" 
Very true, forgot to mention that. Technically speaking tilt the Rosto backwards at exactly 30
degrees and rock side to side at 30 degrees swing each way at 60RPM (rocks per minute) while
maintaining the 30 degree backward tilt:-)
Getting ready to head for the Farmer's Market in Hilo then off to a couple Botanical Gardens before
heading up to Parker Ranch country (Waimea) for range fed beef Koa wood grilled steak dinner!
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15) From: Jeff Faust
Anything I roast for 8:30 will be burnt.  I'm doing my lighter roasts around
6.  This is true both rocking or not.  Has anybody else had this issue with
their Rosto?
A question on the variac:  will using this require that I use rocking?  I'm
still undecided if the extra work is worth the larger batch size to me.
One last issue:  my messages are taking a long time to hit the list, on the
order of days.  It's quite difficult to carry on a conversation like this.
Does anybody know what might be happening?

16) From: sho2go
Jeff wrote:
There is clearly a wide disparity between units.  Mine, at 6 min., is
starting to turn the beans a light tan color.  13 min, they are baked and
sort of folgers colored.  I was going to return it (even got an RMA) but
after hearing about hotter ones, decided its easier to block the air vent a
little, than to spend big $$ on a variac.  Blocking the air vent totally
changes the character of the roast.  Unblocked, I can't really tell when 1st
crack is over, and it never really gets to 2nd.  Now, I can get a veritable
string of firecrackers for first, if I want.  And 2nd not too far behind.
Lots of playing to do here.  I find 151 gr. only requires rocking for a few
minutes, until the beans lighten up enough to move on their own.  Also makes
a more even roast than a smaller batch. ]
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