Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
The load strength of the piano hinge is determined by a couple different things. They are first determined by the number of knuckles in the hinge and second, it is determined by the number of fasteners. The load is actually spread right across the length of the piano hinge. A few examples are to follow. Standard 24-Inch Hinge. This hinge will give you about 60 pounds of maximum weight. So, the spread of weight on this hinge is 2.5 pounds per 1-inch of the hinge. Plastic Piano Hinge. A 2-inch plastic piano hinge can typically handle up to 100 pounds of load per linear inch of the hinge. The plastic piano hinge is an economical alternative to a piano hinge constructed of steel or other metal material. Plated Finished Hinge. Some smaller hinges that are anywhere from 1-inch to 1.5-inches in width are great for lighter load projects.