HomeRoast Digest


Topic: Re-wired Rosto first run (4 msgs / 111 lines)
1) From: Mike McGinness
As I mentioned yesterday I separated the fan so it can be plugged
independently of the heater. First roasts today controlling heater with
variac, fan direct 120v.
First thing is I can't go by Rosto sound anymore! I've gotten so I could
tell about how much voltage I was pushing just by the sound. Oh well. Did a
little preliminary no beans run to see how fast the temp changed with
constant fan. Mucho noticeably faster decrease in temp' when lowering heater
voltage, constant 120v fan. Somewhat faster increase in temp. Didn't do
"time trials", as in a control run with both on variac, to compare just
going by past variac usage. So far looks good.
Roasted 4 batches no problems. It'll take a bit of getting used to the tone
of the fan not changing when changing voltage. Found I really had to pay
attention to the dmm or tended to over increase or decrease heater voltage
at first. Also, don't walk away during the "cooling" or it'll still be going
when you return! Dial means nothing of course, fan direct plugged.  I
thought about removing the heater from the dial too but decided it was a
good "safety feature" to have the heater shut off by timer. I don't use the
timer as a timer, just crank it up to max 13min to start and crank it back
up before it goes off if doing a longer profile. Actually it's become a
habit to crank it back up to 13min. after about 8min. regardless the profile
I'm roasting. But if I did get distracted it's good to know the heater will
shut off by itself...
BTW, I've solved my digital camera SmartMedia Floppy Adapter problem. Just
did a search under the name of the software driver (Flashpath) and got the
WinXP driver from another brand adapter. Works fine. When I do the mod on my
other Rosto I'll take pictures.
More later.
MM;-) aka Kona Krazy miKe mcKoffee
Variable Variac Rockin' Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

2) From: Mike McGinness
Replying to self: additional thoughts on roast batches...
One thing I hoped to achieve, and believe I have, is more even low voltage
warm-up stage. I used a lower starting voltage for the heater coupled with
the constant 120v blower and got an evener 8min pre-1st ramp. I changed my
warm-up ramp time to 5min to 350f, then 3 more min to 380f start of 1st
crack. Was 6min to 380f but occasionally got grassy results. Previously
tested increase in warm-up ramp time with grassy gone results. I'm going to
play with this new warm-up ramp for awhile. Also makes keeping track easy
time temp' wise. 10 per min. from the 5min 350f mark to target finish. So
If 10min total time approaching temp should be approaching 400, 12min 420
etc. Ok ok, I'll quit boring you with the details and though processes!
MM;-) aka Kona Krazy miKe mcKoffee
Variable Variac Rockin' Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

3) From: john kangas
<Snip>
You're not getting off that easy! I'm really interested in what turns up! I 
can't quite acheive this level of profiling, with my almost-underpowered 
Popcorn Pumper and recirculation...
But one of the local scrap bins I've been keeping an eye on turned up some 
stainless pipe- 6.375" ID, .125" wall, 11.5" length! :-) Wheee!
And soon I'll actually figure out which of my insidious roasting plans it 
will be used in, and the profiling shall begin...
John
MSN 8: advanced junk mail protection and 2 months FREE*. http://lists.sweetmarias.com/mailman/listinfo/homeroast">http://join.msn.com/?page=features/junkmailhomeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

4) From: Ed Needham
A 14" piece of that same stuff, with four small angles welded to the bottom
for attachment, and a piece of it cut with a plasma welder cost me about
$250.  They said the SS pipe itself was $125.  You got yourself a find, and I
got myself an expensive piece of pipe.  View it in my partially constructed
air roaster athttp://www.homeroaster.com/bigmama.htmlI hate having to have someone else make parts for me.
Ed Needhamhttp://www.homeroaster.comed
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