mycuppa wrote:
Not trying to give away too many secrets, but just a tip for those of you out there looking to manage profile or "S" curve roasting. Many of you have read the theories on endo/exo-thermic transitions of the bean during roasting cycle - so I wont repeat it here. To manage around these transitions, you need to consider "lag effect". If you want to move more carefully between the endo/exo stages, you need to play with your heat or airflow in the lead up to the stage, e.g. anticipate when first crack is about to happen and slow the thermal momentum down before reaching it, e.g. not much good doing it once it has started, etc. Similarly, a common mistake made by some people is they "back off" once FC is underway, only to stall when the FC Exo-thermic stage is over and the beans are once again taking in heat. It's only natural for people to think or act this way - what they see and hear. In other words, take your actions "before" the stages so that you can move through with control, rather than trying to respond as the thermal lag built-up within the beans are only just starting to "display" mostly once it's too late. Of course, this all depends upon your roasting equipment and how responsive it can be to your "controls" - try to develop an understanding of the lag affect for your roasting device.
I was pretty interested in this information by mycuppa, but no one seemed to comment on it. Would this be useful for the KKTO or is it too small to have a noticeable lag effect as per mycuppa's post? I suppose not having control if the heat/fan separately would be an issue, but Borat seems to have found a solution to that. I really think it's interesting to have a commerical roasting helping in the forums so that we can better understand the art of good coffee roasting. Thanks to mycuppa.
borat123 wrote:
Here's the link with pics and info: http://coffeesnobs.com.au/YaBB.pl?num=1292925707/5 Less than $20 bucks in parts for the mod, but you'll need someone electrically qualified to do the turbo oven rewiring for you. After the mod, roasting larger batches is much easier, just set and forget until it gets to 1C. Having the element manually switchable makes a huge difference to the batch size you'll be able to roast.
Borat, I'm just trying to understand what your mod does. So basically your element is now on 100% all the time until you turn it off is that right? It no longer pulses on and off like a standard TO? Would be interested in modifying my spare TO. Is it possible to post up a parts list and a electrical diagram so that I can better understand what's involved? At least then I can show a sparky what is required and he might understand what I'm on about. 🙂
