Lake Havasu City, Arizona is not really what you would say is a "dry"
town, but yesterday I scoured all the stores and thrift shops to find a
Martini Shaker. No luck! None of the thrift shops ( I passed on
purchasing ANOTHER hot air popper for $3.00, they are starting to take
up too much room) or hardware stores had them, or anything close.
Walmart had a whole set of bar equipment, but I was not going to spend
15 bucks for an experiment if I could help it, and then not use most of it.
At the end of my quest C informed me that we have those stainless steel
milkshake cups in the fifth wheel.
Oh yes, we sure did. The one I grabbed is about 7 inches high, 4 inches
across the top, 2 and a half inches across the bottom, and made out of
stainless steel :)
I took the roasting chamber off of the Pumper (3 phillips screws) and
removed the swirl cup. The new stainless steel cup just slipped in but
not far enough. Putting the two pieces between a couple of chunks of 2x6
I swaged them together gently by tapping with a 2 pound hammer until the
bottom stuck into the flange the proper distance.
This is not rocket science ;)
What swaged was the flange. The cup stayed nice :)
Trial and error, but no error this time :)
Next I took a Sharpie and copied the slots that were in the smaller
chamber onto the new one, and then got my trusty Dremel and sawed some
Louvering was no problem with a smaller hammer, a 1/8" punch, and a
screw driver to finish things off.
There are 20 slots on my new chamber, angled downward, and only 16 on
the original.. ( more air flow).
Well, I could not wait to put the thing really back together to go try it!
I took the chamber off of my "do not touch' roasting set up, replaced it
with the newly swaged flange and new ss chamber.
Have not bothered yet to put a top on it. It just kind of balances there
in the old plastic cylinder chassis.
Quickly weighed ot 250 gr. of my favorite experimental bean, and turned
on the Pumper air.
I dumped the beans in slowly and gosh, all 250 gr. go in and fill it
less than half way.
Unfortunately, I have to tilt it, but then they move around nicely :)
Turned up the heater Variac, finally to about 90%, before things started
happening, but then first crack was okay, and I could let it set level
as it was approaching 2nd crack.
By this time the chamber was getting full, so I put the lamp chimney on
- upside down! It fits much better upside down :)
Held my thermometer in the bean mass, and let it run to 450 for about 30
seconds into 2nd crack, before I turned off the heat.
The Pumper fan cooled the beans just fine. Things were too loose and too
hot to dump them into my cooler.
Coffee looks and smells fine :)
What have I learned today?
This is probably the easiest way to modify a pumper yet.
The air ran full the whole time, and the power was on full most of the
Essentially the Pumper will do a pretty good roast of a half pound with
only adding this chamber and removing the thermostat.
This works just fine without the Stinger :)
Okay, so I really do need the Variac to adjust the heat better, but I
COULD do without it if I didn't want to play with the profiles.
You can roast a half pound of coffee with only 1250 watts, in a
reasonable time, and not a lot of modification (did I say that?)
Next step.... one pound..
Still deciding whether to strip his roaster or not, here in LHC