Streamline Cross-Hole Deburring with Flex-Hone® Tools: A CNC-Compatible Solution

by Bernard Martin

A Flex-Hone® tool is used on a CNC machining center to deburr cross-drilled holes inside a hydraulic manifold. This process removes internal burrs and sharp edges created during intersecting hole drilling, ensuring unobstructed fluid flow, leak-free performance, and extended component life.

​Cross-hole deburring is a common process in industries like aerospace, automotive, and hydraulics. Burrs in cross-drilled holes can obstruct fluid flow, compromise dimensional tolerances, and pose safety risks. Traditional manual deburring methods are often labor-intensive and inconsistent, leading manufacturers to seek more efficient solutions.

The Flex-Hone® tool by Brush Research Manufacturing (BRM) offers an effective alternative. This flexible honing tool is designed to remove burrs from cross-drilled holes while simultaneously improving surface finish. Its self-centering and self-aligning features make it adaptable to various bore sizes, and it can be used with CNC machines, lathes, mills, and handheld drills. The tool's low-pressure, low-temperature abrading process ensures that the base metal's structure remains intact, preserving dimensional tolerances.​

For optimal results, it's recommended to use a slightly oversized Flex-Hone® tool relative to the bore diameter. This allows the tool to effectively reach and deburr the intersections of cross-drilled holes. It's also important to use a high-quality honing oil, such as BRM's Flex-Hone® oil which helps prevent tool loading and maintains cutting efficiency. A recommended practice is to rotate the tool clockwise during initial strokes, then reverse the spindle and continue in the opposite direction. This technique promotes a symmetrical deburring pattern and prevents burrs from folding back into the cross-hole.​

Implementing the Flex-Hone® tool in automated processes enhances consistency and reduces cycle times. By integrating this tool into existing CNC setups, shops can achieve high-quality deburring without the need for additional specialized equipment. This approach not only improves product quality but also contributes to cost savings and increased production efficiency.​

Check out this demonstration of the Flex-Hone® tool in action in the below video.

For more information or a demonstration in your shop contact us here at JMI CNC & Automation!