Holes that qualify as âdeep-hole drilling are three or more drill bit diameters. deep. When drilling this deep, the speed and feed rate must be adjusted to. reduce friction. Friction creates heat, and heat build-up in the drill bit can cause. failure and breakage. Lubricants help dissipate heat from the tip of the drill bit, prolonging drill life, and should always be used when deep-hole drilling.
Humphry's Peak (not to be confused with Mt Humphrey's in the Sierra) in the Coconino National Forest, is the tallest summit in all of Arizona. It is part of the San Francisco Peaks, a volcanic mountain range 9 miles north of Flagstaff, Arizona.
Arizona Snowbowl is an alpine ski resort located on the San Francisco Peaks, 7 miles (11.2 kilometers) north of Flagstaff, Arizona. The base elevation of the facility sits at 9,200 feet (2,804 m) and the resort receives an average annual snowfall of 260 inches (650 centimeters). It has a 2,300-foot (700 m) drop, the largest in Arizona, and has 5 lifts servicing the mountain.