I'm looking for suggestions on how to mod the iRoast2 with the addition of a thermocouple. The goal is to be more consistent with the roasting than my normal (for now) eye ball method: "Yup, looks done". Mostly I want to know if I drill a small hole in the side and somehow thread the thermocouple in from there, or go in from the top. Any ideas?
From the top. Check out the tip sheet on SM for information about that. I was able to carefully thread a SM thermocouple into the roasting chamber w/o cutting any holes. It wasn't anything that had long term appeal, mostly because I use the IR2 inside, and the dryer vent thingee didn't seat properly with it in place. However, in between eyeballing and using a power tool on the contraption lies a middle ground involving listening for the cracks, noting the smoke/smells, and keeping good records of your roasts. It works for me, but I am not entirely a data driven sorta gal. v Mike Garfias wrote: <Snip>
I'm still a newb for sure, but this is very true. You can see, if you chart your roasts minute by minute, very quickly where the cracks tend to happen on a given bean. It's really helped me see in only a few roasts how something like the Guat Blue will roast in comparison to a larger bean like Sumatra. The same weight of Sumatra ramps up in temp much faster for me, and has led me to decrease the size of the roast. I'll assume this is do to the size/weight of the bean and it's not being able to cycle through the i-roast as well. Anyway, having fun for sure, I've bought a few five pound batches so that I can really roast the same thing over and over again to get a feel for the machine, and roasting in general, with the ability to take the variable of differing coffees out.
I ran my thermocouple wire in through the bottom. You will need to take apart the roasting chamber by removing the screws at the bottom of the chamber. The wire first goes down on the outside between the glass and the plastic and then back up on the inside of the chamber. The wire then bends in toward the center and down a bit to always be in the bean mass. If you do it right, the wire does not contact the metal reflection plate. (I think there is an o-ring.) This is a semi-permanent mod, in that it is easy to undo (no drilling), but you do not need to mess with the wire every day. The wire does not move around, so your temperature measurements remain consistent from one roast to the next. On 12/29/06, Mike Garfias wrote: <Snip>