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Type: Posts; User: Mike C.

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    "i have a ball screw on y. never noticed any...

    "i have a ball screw on y. never noticed any backfeed. "

    I have a 3hp Van Norman bridge mill with ballscrews on both X and Y axes. It will backfeed when you least expect or desire it, unless you...
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    Ballscrews will backfeed under pressure unless...

    Ballscrews will backfeed under pressure unless the axis is locked solid. For a manual machine, Acme is far better.
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    Also I'll again bring up the little Van Norman...

    Also I'll again bring up the little Van Norman 12. There were a zillion of them made during WWII. They have a geared powerfeed on the table for super smooth cuts and also can convert to horizontal...
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