For the Yahtzee fan...For the Engineer...6 stainless steel, precision-machined dice.Use this link for a video introduction to these dice. Estimated die weight: Stainless Steel 54.5g (1.92 oz) (to be delivered in March) The geeky stuff( Amber writes: ) In a single, solid rigid body, the For the special case of dice, rotational motion becomes important in the dynamics of a rotating cube. Rotational dynamics depend not on the When I decided to design Metal Dice, I wanted to minimize the rotational I designed the die to display the face features (‘pips’ or ‘dots’ numbering one through six) by drilling one or more spotfaces in the classic die pattern. By changing the drill depth of each pip to compensate for the mass of the material removed from the opposite face, I was able to match the geometric In the real world, there are several issues to consider: - The material used in the fabrication of the die is not exactly homogenome in density. The
**Center of Mass**and**Moment of Inertia**could not be guaranteed even on a featureless cube. - The depth of the spotfaces can only be controlled to within the fabrication tolerances of the CNC machines used. In most cases, this is within +/- 0.002 inches.
- The actual location and classic pattern of the pips on any given face is also limited by the tolerance of the CNC machine. This variation also causes the
**Moment of Inertia**to drift from the**Centroid.**
All of the above issues led me to design a die that closely approximates a perfectly weighted ¾ inch cube. The variations from the ideal To apply a common comparison, the average diameter of human hair is 0.003 inches. |