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Thread: Chris' G0704 build

  1. #421
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    Default Re: Chris' G0704 build

    The Bridgeport J-head uses a total loss oiling system. Everything you put in at the top
    eventually drips out the spindle nose.

    I have read that they did made ones with sealed greased bearings for wood shops.



  2. #422

    Default Re: Chris' G0704 build

    Yep, it just drips out of the bottom. Every once in a while when I get to the machine there will be a few drops on the table just under the spindle. Over oiling isn't really a problem that I've com across, but I suppose if it was running out of the spindle it could be a problem. However, over greasing is a big issue. Increased parasitic drag and overheating as a result of grease churning can also reduce bearing life.

    I put a thin o-ring above the spindle nut (for lack of a better term) and a thick o-ring below the spindle nut. This forms a labyrinth seal of sorts and helps keep coolant out and oil in, but it's not perfect. The results have been good though.

    Interesting issue with the wood milling. I have milled some wood but it's not something I do for customers. And yes, I bet that steel is what works your bearings over.

    I've been sticking with 4.5 cu/in MRR in Aluminum. It's been working awesome. I'm sure I could go harder, but I don't run volume jobs so it;s not a concern I guess.



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