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10/19/2021 6:22 AM
Welcome tarunk!

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10/14/2021 10:06 AM
Thanks for the addition to the group. Seriously considering building a drum roaster along the lines of oldgrumpus's. Love the design and craftsmanship.

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Morning, ar3mia ! and... coffee drink

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Brass Monkey Cold
oldgearhead
On December 8th I stepped into the garage to roast a couple of jars of coffee. The first thing I noticed was, of course, IT WAS VERY COLD! In fact it was 11? outside and 27? in the garage. My previous low roasting ET (ambient) was 36?F, so I was a little concerned. I had two jars containing 500g of green coffee, each: a Panama Boquete SHG, and a PNG SWP decafe.

Here is what I did and it turned out fine:
1) Panama Boquete - Reduced load from 500g to 400g, increased PVT (process variable temperature) from 517?F to 620?. Notes: first crack occurred 90 seconds later than usual and the total roast time was 13.5 minutes instead of 12 minutes, the inlet air temperature was still above 100?F, but not up to it's usual 130-150?F, and I didn't use the back inlet air mixing door (I will next time).

2) PNG/SWP decafe - I did not reduce the load, but I did increase the PVT to 620?F. Notes: Total roast time = 13.0 minutes, and inlet air = 106?F

3) Ordered the MightyMite insulation for the roast chamber..
No oil on my beans...
oldgearhead
23 January 2014
Ambient temperature = 9?F
Okay I just wanted to see if I could do it with the rear door 80% closed and the SC 75% insulated.

446 grams Bali Blue Moon and heater element at 1064 watts:
T+6:00 - Because the inlet air was only 77?F, I got worried and increased the element wattage to 1400.
T+ 10:45 - First crack. Inlet air = 125?F
T+ 14:00 - Finish

Results look fine, but it did take a couple of minutes longer than normal, because the ROR slowed more than I like right after first crack.
No oil on my beans...
JETROASTER
I'm interested to hear how it cups compared to the 12 minute stuff
-Scott
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