... | @@ -25,11 +25,10 @@ Users have developed different techniques for fabrication of the backing mold. T |
... | @@ -25,11 +25,10 @@ Users have developed different techniques for fabrication of the backing mold. T |
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As in both of the examples pictured above, a mold that produces a silicone negative of uniform thickness and with regularly spaced particle wells will lead to the most reproducible and easy-to-produce castings. One innovation that has proven successful and improves the versatility of the backing mold is to machine a dish to precision flatness, then to drill an array of tapped holes into the dish. Any desired particle shape can then be machined or printed with a matching threaded post and screwed into the dish. Thus, a single backing mold can be used to create particles of any shape. Note that the [inverse analysis] technique to back out the vector forces on urethane particles are only well-developed for circular particles.
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As in both of the examples pictured above, a mold that produces a silicone negative of uniform thickness and with regularly spaced particle wells will lead to the most reproducible and easy-to-produce castings. One innovation that has proven successful and improves the versatility of the backing mold is to machine a dish to precision flatness, then to drill an array of tapped holes into the dish. Any desired particle shape can then be machined or printed with a matching threaded post and screwed into the dish. Thus, a single backing mold can be used to create particles of any shape. Note that the [inverse analysis] technique to back out the vector forces on urethane particles are only well-developed for circular particles.
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* A modular dish with cylindrical posts of two sizes:
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* A modular dish with cylindrical posts of two sizes:
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![ModDish](/uploads/UnderConstruction.jpg)
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![ModDish](uploads/36dffe8e5a1335ee0cf91938a40b0e53/DSC_2294.jpg)
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* Examples of other post shapes, with threaded rods revealed:
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![ModPins](/uploads/UnderConstruction.jpg)
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* A close-up of the removable posts, with threaded rods revealed:
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![ModPins](uploads/2dc0517f77c8849c4f09fa745e397d40/DSC_2287__4_.jpg)
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Making a mold of the sample
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Making a mold of the sample
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