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.
A common misperception is that this peak is the highest in Arizona because you unable to see Humphry's Peak behind it from Flagstaff, Arizona. It's summit is 12,356 feet above sea level. The mountain is closed to climbers in winter due to snow and protecting the fragile tundra enviroment.
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.