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  1. #1
    Join Date
    Sep 2011
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    Sydney
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    232

    Default [Beginner] Trimming mill gib?

    Hi,

    I'm guessing my ways and/or gib might be worn on this 30+ year old mill.

    The gib is sticking out of the back, reducing my travel by 25mm.

    What to do here, cut that 25mm off, make a new gib?

    Cheers
    Richard "Looking for a loved 9x20 lathe" Thornton
    Sydney, AU

  2. #2
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,540

    Default

    You could although they can be tricky to make, being long and slender.

    Perhaps try some thin shim behind it - even start with a layer or two of Al foil to get a feel for the thickness you need.

    Michael

  3. #3
    Join Date
    Sep 2011
    Location
    Sydney
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    Default

    Quote Originally Posted by Michael G View Post
    You could although they can be tricky to make, being long and slender.

    Perhaps try some thin shim behind it - even start with a layer or two of Al foil to get a feel for the thickness you need.

    Michael
    Thanks, shims is a great idea!

  4. #4
    Join Date
    Oct 2019
    Location
    Adelaide, SA
    Posts
    1,198

    Default

    Abom79 did a gib repair video recently and shimmed the gib.

    https://youtu.be/74MUEu0h1_g

    Probably worth watching.

  5. #5
    Join Date
    Sep 2006
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    Mallacoota,VIC,Australia
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    Default

    There is another shimming a gib video from H&W on YouTube https://youtu.be/qsKk9OajQLg which is also a good video.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  6. #6
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    Sep 2011
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    Sydney
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    Default

    Thanks, here's a photo of the front with the gib "flush" at the back, I assume it would be normal for my shimmed gib to protrude 30mm at the front?

  7. #7
    Join Date
    Sep 2011
    Location
    Sydney
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    Default

    Sorry if this is a daft question but are the ways on the gib side tapered to "match" the gibs, like if the gib taper is 1:80 is that repeated (in reverse) on that side of the ways, so you get a uniform mating surface on the dovetail?

    Cheers
    Richard "Looking for a loved Taiwanese 9x20 lathe in Sydney" Thornton

  8. #8
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
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    Default

    The answer is YES the tapers would match otherwise it just wouldn't work properly. In regards to your previous question about your shimmed Gib, to me I think 30mm would be excessive unless the Gib had been originally made quite long.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  9. #9
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    I suspect that the gib is a little long. On my mill the gibs are about 10 mm short of the full length. When adjusted the screw head is just about flush with the casting. I have mine adjusted on the "X" so that it is very slightly tight, this removes all the end play in the table. Before adjusting "X" I could get several thou back to front rock.
    Best Regards:
    Baron J.

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