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how to balance dice?

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  • how to balance dice?

    I milled some pieces of my mystery metal to .5" cubes to make some dice.
    I am going to drill the spots into them.

    I got thinking about center of gravity and how to balance them.
    My first idea was to drill the number one hole six times deeper than the holes on the number six side, and use the same formula for the other numbered sides. But a deep hole on one side and shallow holes on the other will offset center of gravity. ( I think?)

    Second thought is that the "one" side should have the same depth hole as the "six"side, but six times the diameter.
    Some how that doesn't feel right either.

    So how do I keep center of gravity centered?

  • #2
    There is no such thing as gravity.

    It's just that the earth that sucks.



    I'd never noticed commercially made dice having any sort of balance compensation that was visible. It seems a very complex scenario as you have varied numbers on all sides and problems with adjacent to opposite sides and number of marks. Is this too much thought? Is it a matter of just make all the spots the same and see how they roll?

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    • #3
      The concept:

      For equilibrium, the sum of the moments of the material removed must equal the sum of the moments removed on the opposite side of the die.
      Last edited by Mike Burdick; 06-13-2015, 12:41 PM.

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      • #4
        Originally posted by Mike Burdick View Post
        For equilibrium, the sum of the moments of the material removed must equal the sum of the moments removed on the opposite side of the die.
        I agree. But won't the depth of the holes change center of gravity? Six shallow holes versus one deep hole will shift things.
        The total material removed should be the same distance from center of gravity.

        Trying to balance a flywheel that spins on three different axis's

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        • #5
          How to make "loaded" dice is a well kept secret.
          _____________________________________________

          I would rather have tools that I never use, than not have a tool I need.

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          • #6
            1-880miner,

            Let me make my statement more clear...

            For equilibrium, the sum of the moments of the material removed must equal the sum of the moments removed for each axis of the die.

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            • #7
              Why is it even required? A perfectly balanced dice will randomly fall on any side, but so will a non-perfectly-balanced one to the extent of mis-balance provided by different numbers of dimples. It's not like you could rely on it even in the smallest way for any kind of manipulated result.
              Peter - novice home machinist, modern motorcycle enthusiast.

              Denford Viceroy 280 Synchro (11 x 24)
              Herbert 0V adapted to R8 by 'Sir John'.
              Monarch 10EE 1942

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              • #8
                I guess I don't own any dice so don't know what they do but if I were to build some I think id put one and two at odds and three and four and then five and six,,, that way they are all balanced to within one small divots worth - would call that good enough for who it's for...

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                • #9
                  Originally posted by A.K. Boomer View Post
                  I guess I don't own any dice so don't know what they do but if I were to build some I think id put one and two at odds and three and four and then five and six,,, that way they are all balanced to within one small divots worth - would call that good enough for who it's for...
                  The one opposes the six, the two opposes the five, and the four opposes the three. Two opposite sides always add up to seven.
                  Which I had never thought about until now, I wonder if there is a reason for that configuration?

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                  • #10
                    Stamp the numbers
                    "...do you not think you have enough machines?"

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                    • #11
                      the internet is a wealth of info:

                      Casino dice have their pips drilled, then filled flush with a paint of the same density as the material used for the dice, such that the center of gravity of the dice is as close to the geometric center as possible
                      among other things, there are also right and left handed dice

                      neatest thing I read so far was one way to "load" dice is to inject a substance that changes form at roughly human body temperature so that holding the dice in the hand for a longer period of time can cause this state change and affect the balance (face more likely to be showing up)
                      Last edited by RussZHC; 06-13-2015, 03:20 PM.

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                      • #12
                        Use engine-turned or jeweled dots rather than drilling. No material is removed.

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                        • #13
                          Well there's your answer! Stamp the numbers. They've been making them wrong for all these years! Mr. Davidh you are a genius, sir!

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                          • #14
                            Given the density of material you're starting with, drill holes about 2D deep and Loctite in 22 carat gold pins. that should come pretty close to balanced and will look pretty as well.

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                            • #15
                              Originally posted by Davidhcnc View Post
                              Stamp the numbers
                              Can't do that. Snake eyes would become snake legs and we all know that snakes don't have legs
                              Peter - novice home machinist, modern motorcycle enthusiast.

                              Denford Viceroy 280 Synchro (11 x 24)
                              Herbert 0V adapted to R8 by 'Sir John'.
                              Monarch 10EE 1942

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