Making PageWoody Mathematical Beadwork of 30 balls The manual of model making of 30 ball problem ( PDF 653KB ) |

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[Instruction in general] Form a ring five beads in every step. Thread a pair of elastic cord braid through every bead in opposite directions. tips Easier to thread the cord after making its tip hard | ||

Form another loop by adding four more beads to one of the five balls of the first ring.
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Thread the first five-ball ring with the other tip of the same cord so that a Y shape can be made at the intersection of the three balls.
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This Y shape stands good in every intersection made of three balls.
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Form a third five-ball ring by adding three more balls to the two rings earlier made.
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Here again, a Y shape is created at the three-ball intersection.
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Make sure there are three rings each of which are made of five balls.
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Form a fourth ring.
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In making a fifth one, thread the cord through the end ball of the adjacent ring three times.
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Form a sixth ring in the same way.
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Twenty wooden balls have been used so far. If a half-sphere has been formed, then you have worked out the procedure correctly. Ten more beads to go! | ||

Add another three balls, making a seventh ring to the half-sphre.
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Repeat the same procedure so that the new five-rings will form the other half-sphere.
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This picture shows the last one ball is being added.
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Finally, see that a pair of elastic cord braid passes through every wooden ball. (If not, go back to the point without fail.) | ||

When completed, tie the cord.
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Put a big ball inside the 30-ball sphere, stretching the cord blaid.
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Completed work. small diameter : 17mm large diameter : 38mm |

It returns to the first page. (to Ballstructure)