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.
From Wikipedia, the free encyclopedia. Mount Lemmon (O'odham: Babad DoÊ¼ag), with a summit elevation of 9,159 feet (2,792 m), is the highest point in the Santa Catalina Mountains. It is located in the Coronado National Forest north of Tucson, Arizona, United States. Mount Lemmon was named for botanist Sara Plummer Lemmon, who trekked to the top of the mountain with her husband and E. O. Stratton, a local rancher, by horse and foot in 1881. It is reported that Mount Lemmon Ski Valley, on the mountain's northeastern side, receives 200 inches (508 cm) of snow annually.