Garage Door Repair Arvada
Family owned and operated, The Overhead Door Company of Colorado Springs has provided the best products in the industry and exceptional garage door services in Monument and all of El Paso County since 1957. A/C installation and repair, cooling and heating service and repair in Albuquerque, Appleton, Bismarck, Boulder, Cheyenne, Colorado Springs, Denver, Dubuque, Duluth, Colorado Garage Door Pros Eau Claire, Fargo, Fox Valley, Green Bay, La Crosse, Madison, Mankato, Milwaukee, Minneapolis, Rapid City, Rochester, Rockford, Salt Lake City, Santa Fe, Sioux Falls, St. Paul, and Wausau.
Since momentum is conserved, this 150:1 ratio in weight of the door to the winding bar means the fully-wound springs could potentially throw a winding bar at 10.6 mph 150 = 1590 mph = 2332 ft/sec, assuming the energy were perfectly coupled and transferred.
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The Chamberlain brand electric openers (also sold by Sears) I have incorporate a plastic worm gear that tends to wear out after some years of use, requiring a disassembly and installation of a $20 repair kit; this wear is minimized by a properly balanced door.
One can overwind the springs slightly, up to about 8 turns on a standard residential door (that is, 1/2 or 3/4 extra turns), to compensate for undersized or fatigued springs, or increased door weight from painting or humidity, but this results in more stress on the springs and therefore decreased lifetime.