Let us consider a very simple object from home : an ice cube tray. A typical ice cube tray is as shown below.
The ice cube tray considered here is filled with water (mineral water for the purists, for it has a good taste), and put into the freezer ; later on it is taken out of the freezer, and the ice cubes are manually removed from the tray.
Observe the shape of the compartments : it is a truncated pyramid. It is not a cube. Why ? Because this shape makes the demoulding easier.
Now what's happening if the shape is cubic ? The demoulding is difficult.
It is wished an ice cube tray which produces ice cubes which have the precise shape of cubes and which are easy to demould.
What should be done ? Can you propose a new ice cube tray design which fulfills these two contradictory requirements ?
The ice cube tray considered here is filled with water (mineral water for the purists, for it has a good taste), and put into the freezer ; later on it is taken out of the freezer, and the ice cubes are manually removed from the tray.
Observe the shape of the compartments : it is a truncated pyramid. It is not a cube. Why ? Because this shape makes the demoulding easier.
Now what's happening if the shape is cubic ? The demoulding is difficult.
It is wished an ice cube tray which produces ice cubes which have the precise shape of cubes and which are easy to demould.
What should be done ? Can you propose a new ice cube tray design which fulfills these two contradictory requirements ?
Dear Stephane,
ReplyDeletethe problem,as it is formulated, is thas if you want a perfect ice cube, you can not demould it, and if you accept a non perfect cube (truncated pyramid), it is easy tu demould. One of the problems is that lateral faces of the cube are parallel to the way of demoulding. So let's put the cube standing on one point(one point in linked to three faces). You then need two parts joined together, each part shaping a half cube (3 faces).
Use a flexible silcone-type tray that will make demolding cubes easy.
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