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First Crack starts at 10:00, outliers before that, and 2nd crack started at 13:52, but I could have stretched that out. The zig-zags in the blue ET graph correspond to blower adjustments, until just before first crack, when the blower was at the lowest setting.

What I've learned:
1) the beans respond very well when the ET is 200F or more above BT

2) the heaters must operate at full power until somewhere around the end of first crack

3) drying phase can be stretched or shortened, time between cracks can be stretched or shortened, but 300F-400F can not be shortened without reducing bean load

4) partially covering the top of the hopper is a must, and shortens roast time

5) for a smooth ET curve, circulation needs almost continuous, slow, adjustment down, until about first crack, when the blower is at the lowest setting

6) 2 pounds of beans produce a significant amount of chaff

7) concern that lower ambient temperatures might extend roast times

RoasterRob wrote:

Hi Chad

Is this hooked to the pid or manual control? Are you aiming for a roast time of near 14 minutes or is this as fast as the roaster will get there? Your ROR seems a bit fast to 300, then a bit slow from 300 to right thru to dump. Based on the RC size 2lbs might be a stretch.

Does covering the top of the RC affect the airflow and thus the bean movement?

You want see what 5lbs does for chaff, (soon to be 13 lbs)

seedlings wrote: 7) concern that lower ambient temperatures might extend roast times

yes it will

freshbeans wrote:
Hi Chad,
Looking forward to the video!!
-Scott

greencardigan wrote:
Any updates on this one??

I am liking the square design. And I sense I might be building a copy in the near future. :BowDown:

greencardigan wrote:
A quick question.

How is the RC attached to the base/heater section? In the your pics it looks like it's just sitting on top?

seedlings wrote:

...... It works great. The PID on the heat is completely unnecessary. I leave it on full power and adjust the airflow down, which increases the heat.......

dja wrote:
the ones I got are suppose to be 1000 watts apeice, at 700 degrees is what they are suppose to put out, have you had any problems with the electrical solder getttign hot and soft??
Will post pictures when I get mine mounted.

David

dja wrote:
thats the same element that I plan on using, do you have your elements connected in parrallel or so that you can control them seperately?

I plan to connect mine up in a straight 220 circuit,...