Turbocharger Blade Deburring Case Study: How Custom Brush Filament Boosted Brush Life by 25%
Background
Turbocharger turbine blades are among the more difficult automotive components to deburr. Each blade features multiple curved surfaces, a thin trailing edge, and a root section where it meets the hub. The deburring operation must remove machining burrs from the blade edges without altering the airfoil profile—even a few microns of unintended material removal changes the aerodynamic balance of the rotor assembly.
This case study documents a project with a turbocharger manufacturer that was struggling with both incomplete burr removal and short brush life. The solution required more than a catalog order. It required a site visit, a corrected specification, and a custom filament formulation.
1.The Challenge: Deburring Turbocharger Turbine Blades
The customer, a Tier 1 turbocharger manufacturer, was deburring turbine blades on a CNC machining center using an abrasive wheel brush. The operation ran at approximately 2,000 RPM and processed a high volume of blades per shift.
Three problems had emerged:
Incomplete burr removal. The brush filaments were too stiff for the blade geometry. Instead of conforming to the curved surfaces and reaching the burr roots, the filaments glanced off the edges, leaving burrs at the trailing edge and root transition.
Short brush life. Each brush was lasting approximately 3,000 pieces before the filaments lost cutting efficiency. With three shifts running continuously, brushes were being changed multiple times per week, adding downtime and consumable cost.
Inconsistent edge quality. Because the stiff filaments did not contact the blade surfaces uniformly, edge quality varied from part to part. The customer's quality team was rejecting a percentage of blades that failed visual inspection.
The customer initially requested a quote for a replacement brush based on their existing specification.
2. The First Attempt Failed: A Spec Gap Between Purchasing and Workshop
The first sample we produced did not perform as expected.
The purchasing department had submitted a specification that included a filament diameter of 0.8 mm and an overall brush thickness of 40 mm. Based on that information, we manufactured a sample brush to match. When the customer tested it, the results were worse than their existing tool—the brush was too thin to reach the full blade width, and the filament was still too stiff for the curved geometry.
A follow-up conversation revealed the problem. The workshop had measured the actual mounting space and confirmed that the brush needed to be 55 mm thick, not 40 mm. The purchasing specification had been carried over from an older drawing that no longer matched the current fixture.
This is a common issue in brush specification. The person writing the purchase order is often working from historical documents, while the person running the machine knows the actual requirements. The gap between those two sources of information leads to samples that fail for reasons unrelated to the brush technology itself.
We requested permission to visit the customer's facility and measure the actual setup.
3. Our Solution: On-Site Inspection + Custom Filament Selection
The site visit confirmed what the workshop had reported. The brush mounting fixture required a 55 mm brush width. More importantly, observing the deburring operation revealed why the existing brush was failing.
Filament Diameter and Grit Adjustment
The blades were contacting the brush at an angle that required significant filament flexibility. A 0.8 mm filament—even with the correct width—would still be too stiff to wrap around the trailing edge and reach the burr root.
We recommended reducing the filament diameter from 0.8 mm to 0.6 mm and changing the abrasive grit from 240# to 120#.
The reasoning:
Smaller diameter (0.6 mm): More flexible filaments that conform to the blade curvature without deflecting off the surface. The softer action reaches the burr rather than bouncing over it.
Coarser grit (120#): While it seems counterintuitive to use a coarser abrasive for a delicate part, the 240# grit was loading with metal debris and losing cutting efficiency quickly. The 120# grit provided the cutting action needed to remove the burr in fewer passes, reducing heat and filament wear.
Operating Parameters
We confirmed the existing spindle speed of approximately 2,000 RPM was appropriate for the application. At this speed, the 0.6 mm filaments maintained contact with the blade surface throughout the rotation without generating excessive heat.
Sample Testing
A second sample brush was produced with the corrected width (55 mm) and the new filament specification (0.6 mm, 120#). The customer tested it on the same machining center with the same cycle parameters.
For a broader discussion of how filament diameter and grit selection affect brush performance, see our article on Nylon Abrasive Filament Selection: Grit, Diameter & Density Guide for Precision Finishing .
4. The Results: +25% Brush Life and Consistent Edge Quality
The corrected brush delivered measurable improvements in both life and quality.
| Metric |
Original Brush | Custom Brush | Improvement |
| Brush life (pieces) | ~3,000 | ~4,000 | +800 pieces (+25%) |
| Burr removal | Incomplete at trailing edge | Complete on all edges | Consistent pass |
| Edge quality consistency | Variable | Uniform | Reduced rejections |
| Brush changes per week | Multiple | Reduced frequency | Lower downtime |
The 25% increase in brush life was the headline result, but the more significant improvement for the customer was the consistency. The stiffer original brush had required operators to adjust pressure and feed depending on blade position. The softer 0.6 mm filament conformed to the blade geometry automatically, removing the operator variability that had been causing edge quality rejects.
This result is consistent with what we see across similar applications. When a brush is specified correctly for the geometry, the filaments do the work—operators don't have to compensate for a tool that doesn't fit the part.
5. Customer Feedback
The customer's manufacturing engineer provided the following comment after three months of production use:
"The first sample didn't work, and we almost gave up on the custom approach. But the site visit made the difference—the team measured the actual fixture and saw where our old spec was wrong. The new brush runs longer and the edges are more consistent. We've standardized on this specification for all three turbine blade lines."
The customer has since requested a similar filament specification for a compressor wheel deburring application.
6. Why Work With Us
This case study illustrates two things about custom deburring brush development.
First, the specification on the purchase order is not always the specification the machine needs. Historical drawings, transferred part numbers, and fixture modifications all create opportunities for the gap that caused the first sample to fail in this project. A site visit or detailed technical conversation closes that gap.
Second, filament selection matters more than brush dimensions. A brush with the correct dimensions but the wrong filament will not perform. Conversely, a brush with a slightly non-standard dimension but the right filament can outperform a catalog item by a significant margin.
We provide application engineering support for custom deburring brush projects, including site visits, sample testing, and parameter development. For manufacturers working with turbine blades, compressor wheels, or other complex geometry components, we can develop a filament specification matched to your specific part.
For examples of how custom brush development has reduced costs in other high-volume applications, see our article on How Custom Industrial Brushes Cut Costs for Mass Production Manufacturing .
Working on a deburring challenge with complex component geometry?
Contact our engineering team for a technical review. We can evaluate your part, recommend a filament specification, and provide a sample for testing.
Henry Zhu
International Sales Manager
Phone / WhatsApp / WeChat: +86 13818514531
Email:
LG™ Brush – Your Partner in Precision Surface Solutions