When it comes to restoring worn or damaged heavy machinery components, two key techniques often come into play: bore facing and line boring. While both are critical to keeping your equipment in top condition, they serve different purposes and are used in different scenarios.
At BHEL Engineering, we specialise in both — delivering on-site precision repairs across Perth and WA. Let’s break down the difference between these two services.
What is Bore Facing?
Bore facing (also called flange facing or surface facing) is the process of machining the surface area around a bore, typically where two components meet or rotate. Over time, these faces can become worn, distorted, or misaligned, causing problems with fitment and function.
Used For:
- Bucket bosses
- Pivot faces
- Cylinder mounts
- Grader rings
- Bearing surfaces
Goal:
Restore flatness and alignment to the mounting surface for proper part fitting and performance.
What is Line Boring?
Line boring involves the internal re-machining of a cylindrical bore — such as those that house pins, shafts, or bushings. It corrects wear or ovality in the bore so that components can fit securely and move correctly.
Used For:
- Pivot bores
- H-links
- Dog bones
- Quick hitches
- Trunnions and axle bores
Goal:
Restore worn internal bores to the correct diameter and alignment — often followed by welding and machining to OEM specs.
Key Differences at a Glance
| Feature | Bore Facing | Line Boring |
|---|---|---|
| Focus Area | Outer surface around a bore | Inside of a bore |
| Purpose | Restore flatness & alignment | Restore internal diameter & shape |
| Used On | Flanges, bosses, pivot faces | Pin bores, bearing housings |
| Repair Scope | Surface machining only | Often includes welding & machining |
| Performed On-Site? | Yes – mobile service available | Yes – fully mobile setup |
Why Both Matter
Ignoring surface or internal bore wear can lead to loose fits, misalignment, vibration, and early failure of parts. That’s why both services are essential in heavy equipment maintenance, especially in harsh WA operating conditions.
At BHEL Engineering, we provide both bore facing and line boring services on-site, using Hofmann Triangle equipment to ensure precision, durability, and minimal downtime.