When Good Tools Go Bad

摘要

In my travels, one of the most common questions I'm asked by contractors is: "How long should my tool last?" Most drillers already know the answer, but are always looking for a way to calculate and justify tooling expenses. I've been on jobsites where rock bits have lasted 45 minutes and I also know several contractors who are still using the same bit for the last two years. There is no question that an HDD tool's life is finite. Some tools die a violent death buried too deep to save, while others slowly wear out to the point they can no longer go on.