Case Study January 14, 2026 | Jaborandi – BA
- Razors Edge Concaves vs. Original Concaves (OEM)
- January 14, 2026
- Jaborandi – BA
- John Deere S7 900
- Soybeans
Report Objective
Present comparative field results of Razors Edge concaves vs. Original Concaves (OEM), evaluating:
- Grain loss;
- Impurities
- Fuel consumption
- Operational yield;
- Financial impact;
- Economic viability of the investment;
- Proposed improvements identified during the process.
The tests were conducted in accordance with the methodology described to the right, in the Technical Test Methodology Report.
Evaluation Methodology
Loss collections were performed using the ScherGain Drop Pan.
Three loss collections were carried out, and the average was calculated for:
- Original concaves (Kampag) – Installed on a John Deere S780 combine
- Razors Edge Concaves – Installed on a John Deere S7 900 combine
Samples were collected in an area of 0.5 m² × 2, converted to 1 m² (ScherGain Drop Pan collection area):
- Converted to loss per hectare (bushels/acre)
- Total loss in the harvested area
The financial conversion considers:
- Total harvested area
- Average yield of the area
- Total loss in the harvested area
- Market price per bag at harvest time
Technical & Economic Evaluation
Technical Results
Avg loss: 0.41 bu/ac 
Avg loss: 0.17 bu/ac 
Drop Pan
Use & Benefits
The ScherGain Drop Pan provides fast, accurate grain loss measurement so operators can make immediate, informed adjustments in the field. Designed for safe and efficient use, it allows for precise sampling at the ideal collection point, giving a clear picture of machine performance in real time.
By isolating losses from the threshing and separation system, header, and natural field conditions, the Drop Pan helps pinpoint exactly where grain is being lost. With that information in hand, operators can quickly correct issues, protect yield, and maintain peak harvest efficiency.
Economic Feasibility Analysis
Financial Analysis Grain Losses
- Difference (bu/ac) = Original Concave Loss − Razors Edge Loss
- 60lb bushels saved = Difference (bu/ac) × Total area
- Total value saved = Bushels saved × Price per bushel × Area
Financial Analysis Fuel Consumption
- Difference (L/ac) = Original Concave Consumption (L/ac) − Razors Edge Consumption (L/ac)
- Liters saved (total) = Difference (L/ac) × Total area
- Total value saved = Liters saved (total) × Fuel price per liter
Considerations
- 1:00 p.m.
- Normal harvest conditions, sunny afternoon
- 33°C (91.4ºF)
- 14.6%
- 3.5 hours (approximately)
The combine running the original concave was left at the farm’s usual settings. When Razors Edge Concaves were installed, the combine was set up using Thunderstruck’s recommended settings. With that setup, the machine was able to run an average of 0.5 km/h faster while keeping harvest quality where it should be.
This evaluation focused on overall performance and efficiency and does not include added benefits like cleaner grain or reduced mechanical damage.
Conclusion
The field demonstration objectively proved that Razors Edge Concaves deliver significant technical and economic gains compared to the original concaves.
Results showed an average loss reduction of 0.24 bu/ac, decreasing from 0.41 bu/ac to 0.17 bu/ac, representing a direct increase in harvested yield and an estimated financial impact of $44,592.41 over the evaluated area.
A significant reduction in fuel consumption was also observed, from 1.7 gal/ac to 1.18 gal/ac, generating an estimated savings of $26,640.