When drilling holes on the Ceiling it is difficult to keep the tool and yourself from rolling on top of small fragments and dust. Help out a peculiar conical helix wound from a spring wire. Wrapped in plastic film or package, it will turn into a soft pliable bag that will collect all the crumbs from under the drill.
Recommend to read
Micromotorcycle “Gnome”
Maximum simplicity of design and minimal complexity of manufacturing - these are the principles that were used as the basis for the creation of the Gnome micromotorcycle (see...
AT THE START OF THE MODEL-COPY
Very often the students see on television or in a magazine, the launch of the spacecraft, have a vital interest in how this happens. If I could build such a rocket! And-models are very...
