It is not easy to drill pipe, clamped it in a vise and nukernel. The task will be made easier if you resort to using a small block of wood. It is administered in the Vice with the tube and drill through it. At the moment when the drill bit touches the pipe, the bar will swing to assume the role of conductor, directing the tool, which is especially important if the hole should be through.
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THE LIGHT WILL ACTIVATE THE SIREN
The proposed German magazine "Funkamateur" light relay is activated when light falls on the photoresistor R1 (see diagram) — when this occurs, a loud siren sound. Transistors VT1, VT2...
DROP BY DROP — PEN!
After working with epoxy, always remains a small quantity of it, which can be used for the manufacture of arms to the small tool, such as needle files. To put on them a big "drop" to...
