In the manufacture of structures made of pipes of the same diameter to neverlet holes in them easily and quickly will help here’s a simple jig. It consists of a metal plate and wooden block in advance which is made a longitudinal cut. In the bar there are several vertical through-holes for drill bits of different diameters. Thanks to the conductor drill bit will not slip off from the pipe, and therefore do not need to do this pre-ncarnate the place of drilling.
Recommend to read
ARMORED VEHICLES OF THE U.S. ARMY
The history of American wheeled armored vehicles rather unusual and in many ways instructive. Geopolitical position of the country protected it from land invasions. At the same time...
“HERCULES” THE STORM OF MISSILES
Anti-aircraft interceptor missile NIKE-HERCULES MIM-14B. Source options for most anti-aircraft missiles designed in the 1950s "on both sides of the ocean", become missiles manufactured...
