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How often should a bridgeport be torn down and cleaned?

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I'm in the process of fixing my J head 1961 Bridgeport and I started wondering how often one would tear down a Bridgeport like this to clean it?

The knee gib is broken, so I'm removing the table and saddle to reduce weight and stress on the knee. As I'm tearing it apart the old oil on the gibs and ways resembles the consistency of honey than oil. And chips everywhere, I mean everywhere. Not to mention it looks like some chips are stuck to the ways and other bearing surfaces.

I'm going though a lot of WD40 and elbow grease as I'm tearing it down.

I will say though, the saddle had an odd section where there was almost no wear and everywhere around it was worn down enough that I could catch it with my nail. When I have it cleaned up enough I'll start inspecting parts on the surface plate to see how warn things are.

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