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.
Mt. Lemmon/Summerhaven Information. The Summerhaven subdivision of Mount Lemmon, Arizona is a community approximately 29 miles north of Tucson in the center of the Santa Catalina Mountains at an elevation of 8000â. The whole Santa Catalina mountain range is mistakenly called Mount Lemmon.