The Roaster Desk

By Kai Nakamura · Production roaster & equipment editor · Updated 2026-09-17

How to Transition Roast Profiles From Aillio Bullet to Loring S15

Transitioning roast profiles from an Aillio Bullet R1 V2 (1 kg induction) to a Loring S15 Kestrel (15 kg gas recirculation) is not a direct copy-paste operation — heat transfer rates, drum RPM, and airflow curves differ by an order of magnitude.

We document the scaling methodology used by Onyx Coffee Lab during their 2024 production migration, anchored on development time ratio (DTR) and rate-of-rise (RoR) targets rather than absolute time-temperature paths.

Procedure

  1. Step 1: Export Bullet baseline profiles

    From RoastWorld or Artisan, export .alog or CSV for top 5 SKUs by volume. Record DTR, development time, end temperature, and total roast time. Tag green lot density and moisture — Loring charge weight varies ±8% for same volume.

  2. Step 2: Map heat transfer equivalents

    Bullet induction delivers faster early RoR; Loring recirculation gas is slower to peak. Rule of thumb from Loring training docs (2025): reduce first-phase RoR target by 35% when scaling 1→15 kg. Adjust charge temperature down 20 °C initially.

  3. Step 3: Establish S15 charge and airflow baseline

    Start at 50% drum capacity (7.5 kg). Set Loring default airflow to manufacturer baseline for green density class. Log first crack time — target ±15 s of scaled Bullet equivalent after three iterations.

  4. Step 4: Iterate development phase

    Match DTR within ±1.5 percentage points before chasing end temperature. Loring afterburner settings affect ET curve — hold afterburner constant during calibration.

  5. Step 5: Lock profile and enable automation

    Save verified curve in Smart Roast as SKU template. Run cupping panel blind against Bullet baseline — ≥ 4/6 panellists must prefer or tie before production lock.

FAQ

Can I import .alog files into Loring software?
No direct import. Use DTR/RoR targets manually. Cropster bridges both platforms for side-by-side logging during calibration.
How many calibration batches should I budget?
Minimum 20 batches per SKU at 30–70% capacity — approximately 150 kg green coffee waste. Plan $2,400–$3,600 USD at origin pricing.
Does drum RPM transfer from Bullet?
No. Bullet fixed drum; Loring variable. Start Loring at 48–52 RPM for washed Central American greens — adjust by 2 RPM increments.
What about airflow equivalence?
Bullet fan steps 1–9 do not map to Loring percentage. Use Loring training defaults per green class, then adjust on RoR response.

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