Trepanning is a specialised machining process used to create large diameter holes in solid materials — especially when traditional deep hole drilling or boring becomes inefficient. Unlike standard drilling, trepanning removes a solid core rather than turning the entire volume into chips, making it ideal for reducing power consumption and material waste.
Trepanning is particularly effective when machining hardened metals, making it a smart choice for industries where material cost and energy efficiency are critical — such as Aerospace, Oil & Gas, Defence, and Heavy Engineering.
At Mollart Cox, we provide trepanning as a cost-effective solution for components that require:
While deep hole boring remains one of our core competencies, trepanning offers clear advantages in specific applications — particularly when machining thicker-walled parts or when the central material can be repurposed. For suitable materials and geometries, it can also help reduce tool wear and overall cycle time.
Whether as a standalone process or as part of a multi-step workflow, our in-house trepanning service ensures precision, repeatability, and performance — even on oversized or high-strength components.
