Great stuff! I have switched to using my PI almost exclusively. I am
able to get an easy 200 gr. out of her without rocking. stirring etc.
I've been meaning to post this for a while, this seems like a good time.
First thing I do is strip her down and throw away the shell, the plastic
chamber extender, and the metal plate that covers the motor base. Save
the feet, and the rocker switch from the shell. (I don't use it on this
machine again, but it works nice to mod a non PI for newbies)
Look straight above the cord where the little metal housing meets the
plastic. There should be a plug in there. If not block the hole with
high temp silicone, or etc. If this is left open, it will reduce the
quantify of beans that can be roasted.
Remove the fan from the heater section, and disable the thermal switch.
If you don't it will mess with your profiling. After you do this mod,
make sure you never leave the machine working and unattended.
There are several choices for a chamber. You can use the larger
hurricane lamp glass and silicone it directly in place. Or, a Fresh
Roast base fits nicely also in place. The FR base will let use a smaller
hurricane lamp. If you use a FR base, you must remove the bottom screen
or else you will significantly reduce the bean load you can roast. The
FR base and smaller lamp glass seems to improve cooling by 30 seconds to
a minute; down into the 2 minute range.
I then take 4 or 5 pennies and attach them to one foot. The little lean
helps bean movement by a fair amount.
My current favorite profile is; 200 gr. of bean, fan boosted to 130 (per
variac dial). FYI, if you are lucky enough (like I am) to have plugs on
two different circuits use them. When you cut the heater in, in my
house, it causes enough voltage drop to slow the bean movement. Anyway,
I then set the heater to 125 volts, and kick the temp to 300. This takes
under 2 minutes. I them spend the remaining time between 300 & 6 minutes
going to 350. This means I normally cut the heater down to about 95
volts @ around 275. Watch your bean movement, because I normally reduce
it twice(?) in this time range. I like to keep a nice bubbling action
going, while not tossing the beans into the air.
When I hit 6 minutes I set the voltage back to 125 and send the bean
mass to 400. I start to back the voltage off to under 110 when the bean
mass hits 390. I then spend the remaining time to around 12 minutes
driving the beans between 400 & 440. In the last 30 second or so I do
crank the voltage up for a "big" finish. I don't know if that does
anything for it or not.
To monitor the temp I use a bbq therm that I 've checked in boiling
water, when I first got it, clipped to the glass with the tip in the
bean mass just below the level of where the glass meets the metal. Real
temp, I don't know. Repeatable, yes.
I hope you find this useful. Happy Birthday!
Mark Neuhausen wrote: