Mill City Stories: Sample Roasting- Exposing The Cup vs Impacting The Cup

From on stories on Instagram. Follow us for more. / millcityroasters
Derek deep dives into sample roasting. He breaks down the two main types of "sample roasting" (Importer Sample Roasting and Production Sample Roasting), what the purpose is for each, and shares his roasting protocols for them.
500g Gas coffee Roaster:
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[@edwickson]

You guys are absolutely underrated. No, seriously. There's so much knowledge in this channel. But why most videos had low views.. It's almost frustrating to see the number

[@MillCityRoastersMN]

Thanks for the sentiment, Ed. We're water dripping on the granite boulder of specialty coffee confusion. It's a long process, but the water is winning.

[@morningmotivations2661]

Hi Derek is it possible in the future to also show the roast curve in the screen? Thanks and more power

[@akk.89alk59]

Wanted to ask about the drum speed. Ideally we should be changing the drum speed when we have lower charge weight right? Or is importer sample roasting is just meant to be fast so not much adjustments needed? This is for the 500g roaster.

[@MillCityRoastersMN]

Drum speed affects heat transfer. In most cases, it's a good idea to run max drum speed with maxed size charges. This will mechanically fluidize the green coffee to maintain 70-75% convective heat. Drum speed is reduced for smaller charges to maintain the same conductive contact time resulting in the same 25-30% conductive heating as the larger charge.

[@jianhe3058]

Is it fair to say that something like the small barrel sample roasters are primarily for green quality control sample roasting, while something like the Mill City 500g is more equipped for both kinds of sample roasting (including the production sample roasting)?
Also, I saw your recent Ikawa video. Is that product well equipped for both types of sample roasting (but for very small samples of course)?
For the barrel roasters and the Ikawa, I don't mean is it possible to do a sample production roast in the same way that it's possible for an expert pilot to land a plane after the engines blow out if he's carrying his lucky charm and the stars properly allign. I mean taking Derek, for example, could he reasonably expect to get desireable results for both kinds of sample roasting mentioned in the video on a traditional barrel sample roaster and/or on an Ikawa?

[@MillCityRoastersMN]

Our 500 gram roaster is designed for both greens exploration and profiling roasts. The Ikawa is a good tool for greens evaluation and a heck of a lot of fun to boot.