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Roast profile from hacked P1
sprudge
See anything counterproductive for cooking espresso blend beans in this heat? Thanx.

i.postimg.cc/5NVXPt7r/DFCBA190-6-EF7-45-A2-8-D94-9-BA4843-C069-F.jpg
 
renatoa
470F is possible, some sources quote even 482°F for "charcoal" roasts Grin... but I think the probe measure a serious air-bean mix...
That's because FC at 425F / 218C is a bit too high for most standards.
Same for SC, which should start in the 440F ballpark.
So you can consider the 470 could be a real 460, or even lower.

Another source of puzzlement is the shrink, for a SC roast should be much bigger than 16%.
Coincidence, 16% is exactly the percentage of shrink I got from a medium degree roast last week, with FC under 200 C / 400 F and drop at 211 C / 412 F... real beans temp.
Edited by renatoa on 03/18/2019 11:26 PM
 
sprudge
Thanx. Probe is 3” K type rod thru sidewall of plastic shell and wall of roasting chamber. With any charge 90g or greater, the tip is centered in the chamber in plan view and submerged in bean mass start to finish. The fan motor is on a 7.5amp boost variac but I use the transformer only to correct to nominal line voltage (119-20V) and don’t overclock to retard ROR. Guess ET and BT cohabit in a popper.

I have a higher amperage variac feeding the heating coil. The W designation under “gas” should be V for volts. Heater wattage maxes out at 1400W @ 120V. I’m new to roasting and still greener at controlling and recording temp rate of change. This was definitely well short of an incineration as no sinus-irritating smoke and no oil. I’m not experienced at identifying onset of significant no. of exploding beans either so probably misjudged FC.

I’m trying to develop a drill from start to turnpoint to yellow color change and for manual control ROR to get roast times longer than 6.5’ and RDR @ 1:4 against time to FC on a premixed espresso bean blend. Thought somebody might set me on the straight path.

Have settled on 125g charge for now. Getting great crema as canvas for the milky arts but the body or mouth of the sprudge is too light for my taste.

Jack
Edited by sprudge on 03/18/2019 10:53 AM
 
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