Educational Short: Drum Speed Bingo
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- Опубликовано: 5 окт 2024
- We get asked all of the time what the appropriate drum speed is for a roast. In this Educational Short, we illustrate how drum speed could be too fast or too slow and why. Clearly the "correct" drum speed will vary according to drum size and batch size.
This is an overview to help conceptualize what is happening inside of the drum as you troubleshoot toward your best drum speed. Drum speed management is not a shtick or a superfluous control. It allows you to set the parameters of your roasting environment precisely to the requirements to nail roasts of different batch sizes.
Music: "Osaka" by Birocratic (birocratic.lnk....)
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Didn't learn much, but the look on Derek's face @ 2:16 made it all worth while!
Bingo! what a way to visualize the concept
These "Shorts" are amazing. Im loving the short length informative videos as some video are too long i tend to not watch due to the time. Keep up the amazing work!
make it simple, make it happen, love the new concept, thank you for sharing
It's hard to isolate the effect of variables when you change several at once, but increasing the drum speed since December's class seems to have contributed to an overall better roast across the board.
You are definitely correct. Focusing on one variable at a time and learning it well will help you roast ever better.
I also see the improvements with these videos graphics and end card :) keep it up!
Yesss! Love these short vids. Quick, concise, and to the point. Keep up the great work!!
Also, are you going to do one about air (how much) through the drum and it's effects?
From where I understand, convection is more efficient, because the contact surface is almost 100%.
Can you guys tell us more, how a air bed roaster really works, and if its really good ?
Thank u
Consider warming your hands in front of a hot air vent. Touching that vent will burn your hands because the vent is conducting the heat energy directly to your skin.
If your hands are 6 inches away, they will still heat up, but not as quickly - because the convection of heat energy is "wasted" on the air between the vent and your hands.
In a strictly "Physics 101" sense, conduction is more efficient because the transmission of heat is direct from a hot thing to a cool thing. Convection requires the hot thing to heat a fluid media (in this case air) that then heats the cooler thing. Because a larger percentage of the heat is lost in transmission, it is therefore considered to be a less efficient form of heat transfer. Capeesh?
There isn't really any "right" or "wrong" way to roast coffee, but we prefer drum roasters because they allow us to exert fine control over the application of heat in a manner that makes our coffee taste better.
Great video.
One thing I noticed and I don't know if it carries through to your roasters is that the beans (balls) are concentrated to the side of the drum based on the spin direction. What happens in the actual roaster? If the beans are concentrated to one side as per the bingo cage, does that mean anything to placement of the burners and the BT sensor?
Also, you state the MC roasters are setup so that you 'don't have to worry about centrifusing your coffee' and in the video description it says the 'correct' drum speed will vary according to drum size and batch size. Do you think (or have your experienced) a 100g in the 500g at full speed could centrifuse it? I may not have a firm grasp on the physics (very real possibility) so thanks for the response. I've ordered several MC roasters (soon to be delivered) so I look forward to understanding.
Thanks for the questions! We cover a lot more detail about rotation direction and probe placement in this video: ruclips.net/video/k35XKH3YhII/видео.html
I have never seen a machine that gives the roaster the ability to spin the drum fast enough to stick the coffee to the drum wall. You may be able to make a modification that would allow for this. I mention this in the video because we hear from the field that people are afraid to turn their drum speed up in an effort to avoid that. We are saying, crank that drum!
@@roasterjoe Ah - good to know and thanks for the other link. I was trying to think of how fast it would have to be and I kept imagining what our washing machine does to push water out... The dial would definitely have to be set to 11.
@@shadeartisanroasters1336 Bahahaha! Exactly! That baby would have to be at a SUPER FAST clip. Well said!
I've been loving playing with Drum Speed recently!
No matter what I was doing recently, my exhaust temp would not rise at a decent rate. I lowered my RPM and it solved the problem! Was this fast RPM drawing more air into the roaster?
I can only assume the issue here. My assumption at first is that you were throwing the coffee into the airstream in a way that they absorbed the energy before it registered on your exhaust temp. I can only guess this though... What machine do you roast on?
@@roasterjoe on a 15kg Giesen. Reducing the RPM on all roasts has created much more consistent exhaust temp curves. I was struggling to stop my exhaust and bean curves crossing over after 1st crack, but when I reduced the RPM my initial π at the start increased and allowed me to keep the curves separate at the end.
Fascinating really!
Daniel, I'm glad that is working for you but on most machines those graph lines cross at the end of the roast because the operator is trying decrease the ROR to increase development time after first crack. I'm curious about your setup and roast level. If you can, call the office and ask for Steve.
Want to hear drum speed tuning at different stages. Here is what I heard:
1. slow RPM at drying stage
2. speed up after yellow, with more airflow
3. maintain same RPM or increase slightly, with more airflow
Love to hear from Mill City or anyone!
We set drum RPM slower for smaller charges and faster for larger charges. We seldom change the drum speed during the roast.
Mill City Roasters i found, while air is constant, when rpm is lower than certain threshold, conductive heat become dominant heat source. I think this help me understand machine better.
What is the correct RPM? This seems like it is about 60-70RPM as demonstrated. But most drum roaster are much slower, please correct me if I am wrong.
It depends on the drum size. Smaller drums are faster and larger drums are slower.
Hi mill city roaster...good day, what should be my drum speed in my 5 kg has guaranti roaster???
56 rpm.
In my roaster It indicates 30hz, 40hz,50hz and 60hz what should I use? Should I use 50hz or 60hz?
What's with the neck beard?
Lincoln homage.