Sherline Mill Oiler Repair

While browsing the sherline website I stumble upon a page that describes a feature added to the CNC mills in 2010. It’s a series of passages in the saddle and an oil reservoir. This oiler system sends lubricant to the lead screws reducing wear. This is very important on a CNC machine as the axis moves much more and much faster than a manual mill ever would. Furthermore, the sherline uses a very simple 1/4-20 UNC threaded rod as the lead screw, which is much higher friction than the ball screw found on most CNC mills. I didn’t see this on my mill when I picked it up, but when I looked closer, what I though was a setscrew was actually the broken off remainder of the oil reservoir.

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The previous owner must have either over tightened it, or run into it with a mill. I used a screw extractor to remove the broken piece. It came out easily, it’s made of aluminum so the tool had no problem getting a good bite.

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I ordered the replacements through sherline, PN 50930 for the oiler body, and 50920 for the cap.

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Installation was as easy as screwing in the body.

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This was one of the easier repairs I’ve ever made, and a really pleasant discovery, as now I know that the mill is at most less than 4 years old.