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  1. #1
    Join Date
    Feb 2014
    Location
    Newcastle NSW
    Posts
    78

    Default Hercus C model cross slide backlash....

    Just after some advice on how to minimise the backlash in the cross slide.
    I plan on slowly restoring the old girl over time to as close to origional condition as possible.

    https://www.youtube.com/watch?v=aM5leCZa0nY

  2. #2
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    That's more slop in nut and screw than backlash.

  3. #3
    Join Date
    Feb 2014
    Location
    Newcastle NSW
    Posts
    78

    Default

    Ah ok thank you! Is there a way to adjust it or will i need to replace both the nut and screw?

  4. #4
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    Some backlash won't hurt, but it's nice if it's not excessive.
    First reduce the play that is a result of wear at the thrust collar - instructions in manual.
    Then if it's still too much it's due to wear of the leadscrew and/or the nut.
    There was someone selling adjustable split nuts for South Bends in USA, maybe still available.
    That would deal with nut wear as it develops, but if the leadscrew is also worn you can only adjust the nut until it's just free at the tightest point on the screw.
    The leadscrew could be replaced as a whole, or a new threaded Acme(?) threaded rod could replace the thread only.

    SB9crossnut-ebay6900judy.JPG

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