已按原文做轻量优化，没有改动附件本身。
这篇归入 Roasting Academy。我保留了 150g、40% fan 作为 Roma-X 的建议测试起点，但明确说明它不是适用于所有豆子和所有机器的固定配方。由于 Roma-X 目前仍处于众筹开发阶段，正式发布前应再根据最终说明书确认该参数。
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Hot-Air Roasting Basics Part 2: What Settings Should You Start With?
正文
Your first manual roast can easily go like this:
The temperature seems to be rising too slowly, so you increase the heat. Then the beans begin bouncing too aggressively, so you quickly reduce the airflow.
By the end, the beans are roasted—but you are not quite sure which adjustment made the difference.
The solution is not to make more adjustments. It is to establish a repeatable starting point and change one main variable at a time.
Start With Consistent Conditions
The first step is to find suitable starting settings for your machine.
Before experimenting, keep as many conditions consistent as possible:
- Use the same green coffee.
- Use the same batch size.
- Begin at a similar room and bean temperature.
- Follow the manufacturer’s current recommendations.
- Record the starting heat and fan settings.
Next, find a fan speed that keeps the beans circulating evenly. The beans should move smoothly throughout the chamber without remaining still in pockets or bouncing excessively.
As explained in Part 1 of our hot-air roasting basics, the airflow required to move the beans may change as they lose moisture, expand, and become less dense.
A Starting Point for Roma-X
For an initial Roma-X manual-roasting test, Mago Maga recommends starting with:
- Green coffee: 150g
- Initial fan speed: 40%
From that baseline, adjust the airflow according to how the beans move inside the chamber.
This is a starting point, not a universal recipe. Different coffees vary in density, moisture, size, processing method, and chaff production. Room temperature and electrical conditions may also affect the roast.
Because Roma-X is still in development, always check the latest official guidance and final production manual before operating the machine.
Use Real Roasts to Find the Right Heat Setting
Once the beans are circulating steadily, use actual roasting results to refine the heat setting.
Record:
- Your starting heat and fan settings
- The time of each adjustment
- Temperature changes
- Rate of Rise
- The beginning of first crack
- Total roast time
- End temperature
- Your tasting results
Rate of Rise, or RoR, describes how quickly the measured temperature is changing over time. For example, an RoR of 10°C per minute means the recorded temperature is currently rising at approximately 10°C per minute.
RoR is based on the machine’s temperature reading. It should not be interpreted as a perfect measurement of the internal temperature of every coffee bean.
First crack usually begins as a sustained series of audible popping sounds—not just one isolated crack.
Change One Main Variable at a Time
If the temperature rises too slowly, try increasing the starting heat slightly on the next batch.
If the roast develops too quickly, reduce the starting heat a little.
Whenever possible, change only one main variable between comparison batches. If you change the coffee, batch size, heater power, airflow, and roast time together, it becomes difficult to know which adjustment produced the result.
Small, recorded changes are easier to understand than large reactions made throughout the roast.
Do Not Copy Roast Time Alone
Someone else’s “four-and-a-half-minute roast” reflects a particular combination of:
- Roasting machine
- Batch size
- Green coffee
- Heater power
- Airflow
- Temperature-probe position
- Desired roast result
Change the equipment or batch size, and the appropriate roast time may change as well.
A roast time can provide context, but it is not a complete roast profile and should not be copied without considering the machine and coffee that produced it.
Taste Before You Save the Profile
After roasting, allow each comparison batch to rest for the same amount of time. Then brew the coffees using the same grinder, recipe, water, and brewing method.
Compare:
- Aroma
- Sweetness
- Acidity
- Bitterness
- Body
- Aftertaste
Add these impressions to your roast notes.
A smooth-looking curve is useful, but it does not automatically mean the coffee tastes good. The final cup should determine whether a profile is worth saving.
When you find a batch you genuinely enjoy drinking, save the settings and use them as the reference for your next roast.