| CAD Puzzles |
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| What single object can slide exactly through each of the holes shown besides without leaving gaps ? That is, the object must slip through each hole filling the hole completely. |  |
| The solution is as shown in figure besides. When viewed normal to the green face (side view), it will appear a circle. When viewed normal to the blue face (top view), it is a square, and The front view will show a plus shape. So what has this got to do with CAD...? |  |
| This object is the intersection of each of the outlines of the holes extruded along each of the three orthogonal axes. The plus shape is in turn made up of union of two rectangular blocks. This is called CSG or Constructive Solid Geometry. |  |
| If you have good woodworking skills and make one of these, probably from wood, please let me know and perhaps send me a copy. You may take a cylindrical block of diameter 1 unit and height 1 unit and chisel it out at four places by, say, 0.3 units as shown in the animation on the right. Also, Don't forget to make the base block with the three holes to test it. |  |
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| Fine ! This one will make you look inwards. A stack of 27 cubes (3 x 3 x 3) was dipped in liquid purple color. Answer to yourself.....Quickly... |  |
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This one is a total timepass puzzle. ScreenShots of two AutoCAD sessions are here. You have to spot 10 differences betweeen the two AutoCAD pictures. |