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  1. #1
    Join Date
    Nov 2010
    Location
    Canberra
    Posts
    37

    Default Ball tipped handles

    I really admire the older style handles that have a ball at each end, one might be a nut on a tools post for instance, and a tapered shaft.

    Is there some set design principle that describes the size ration of the two balls and the taper.

    These seem to me to fit some form of underlying design that is described like Phi, or Pi for that matter. Some form of "golden" ration that one should apply.

    I guess I need to make a ball turner first.

    By the way, Happy Christmas, though I am a bit more of a "bah humbug" now the kids have grown.

    Tony

  2. #2
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    There is, I have it in a book somewhere, but I'm a little busy just now. I'll have look later in the afternoon.

    Cheers

    Stuart

  3. #3
    Join Date
    Feb 2007
    Location
    Katherine ,Northern Territory
    Age
    69
    Posts
    736

    Default

    The formula for ball handles is in G H Thomas' Model Engineers' Workshop Manual .
    Some where, it's on line as well but I'm unable to find the link ATM.

    Kev.
    "Outside of a dog a book is man's best friend ,inside a dog it's too dark to read"
    Groucho Marx

  4. #4
    Dave J Guest

  5. #5
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Tony,

    Pages 99 and 100 of Georges book attatched.

    BT

  6. #6
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    from model engineer's handbook by Tudal Cain

  7. #7
    Join Date
    Nov 2010
    Location
    Canberra
    Posts
    37

    Default

    Thank you all guys, this info is precisely what i was after. They are so cool, I know they would cost more to make, but if i were in the business of making and selling machinery, they would be what I'd use.

    I now just have to make a ball turner. Then a tool post handle, then a saddle, tailstock, cross slide handle, then a ............ handle, then a .... I can this can get out of control.

    Seriously, thank you all and on christmas too.

    Take care, Tony

  8. #8
    Join Date
    Nov 2010
    Location
    Canberra
    Posts
    37

    Default

    It occurred to me that how could my favorite book not have details on these handles, and sure enough I found two pages on handles including these bell crank types.

    The Machinery's Handbook is a continual surprise. But as the idea of spending the ask on the current editions, I bought the collectors leather bound first edition reprint for only $50, noting that much within would not be subject to change. It is a beautiful book that looks like a bible, gold leaf edges, black leather binding, fine pages etc. I real bargain.

    Tony

  9. #9
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    extract from one of the links Dave posted

    "Not sure from your answer as to if they are balanced. If they are not, the heavy end will slowly move to the bottom by machine vibration and you'll never get an accurate cut."

    its getting harder Roulston......

  10. #10
    Join Date
    Nov 2010
    Location
    Canberra
    Posts
    37

    Default

    Quote Originally Posted by eskimo View Post

    its getting harder Roulston......
    Yes, which is why the formula was so important, knowing someone had done the hard work to ensure the balance is right. So know I have formula's equations and tables that all appear to produce a common result.

    Cheers, Tony

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