Turning Archive 2006

Subject:
doubled sealed bearings and vacuum chuck

Jeremy
>I have put together a vacuum chuck for the lathe but I can't pull a vacuum better than 7mmHg because too much air leaks through the double sealed bearings. If I seal the area with plastic wrap (lathe not turning) I can get a vacuum of 25-27mmHg so I know the problem is only the bearings. I thought that because they are sealed you wouldn't get air leading. Have I missed something and/or have the correct product?

thanks for your time,
jeremy

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