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 open year-round. Summer activities include: 1  Scenic Skyride: During the summer months, the Agassiz chairlift takes visitors to an elevation of 11,500 feet (3,505 m) for views of the surrounding area including the Grand Canyon 70 miles (112 kilometers) to the north.