Show what you should know about drilling panels the simplest things in radio are the ones that are apt to cause the most trouble for instance drilling the panel this to Is an almost insurmountable obstacle to some of the builders who have never constructed a mechanical ch contrivance in their lives and khz wt view the brace and bit us as a tool of the master mechanic first it Is necessary to lay jay out the position and size of the holes to be drilled where an instrument la Is held in place with two or more setscrews Bet screws it Is best to make a half inch hole for the center shaft it the instrument Is then slightly off it will still turn easily on its bearings without binding in the cartons containing the instruments are often templates showing the spacing of the holes to be drilled these should be used when drilling the holes it if made of paper they can be pasted directly on the panel and the holes drilled through them the paper Is then removed with a wet cloth it if it Is necessary to calculate your own positions do so by measuring the tha distance that one side of the hole la Is from the shaft and thin the distance dl stanco below it for instance nii tance a rule Is laid against the shaft and touching the setscrew the reading on the ruler with one halt half the diameter of tho the shaft or an eighth of an inch will be the distance to one side then by doing this straight up and down instead of sideways the depth vill be found now from the center holemark hole mark measure the proper distance to one side and the proper propel depth from there mark and drill the locast location 0 n of the other hole or holes way may be determined by revers revera ing the procedure |