Drilling pilot holes with down-the-hole drill

As the old saying goes, “Measure twice, cut once.” That truism can apply, too, to drilling pilot holes: Before touching drill bit to wood, take the time to measure carefully and mark the spot where the pilot hole b. [pdf]

Small screw air compressor adjustment

They are used to keep the pressure in a tank between a pre-set lower and upper pressure. When the tank pressure crosses the upper or lower limit, an electrical switch is operated. Normally Closed (NC) switch. [pdf]