Myasthenia (my-from Greek Î¼ÏÎ¿ meaning muscle + -asthenia á¼ÏÎ¸Î­Î½ÎµÎ¹Î± meaning weakness), or simply muscle weakness, is a lack of muscle strength. The causes are many and can be divided into conditions that have either true or perceived muscle weakness. True muscle weakness is a primary symptom of a variety of skeletal muscle diseases, including muscular dystrophy and inflammatory myopathy. It occurs in neuromuscular diseases, such as myasthenia gravis.
Arbor. The arbor size is standard for each standard size miter saw. For 8-inch and 10-inch miter saws, the standard arbor size is 5/8 inch. Miter saws that are 12 inches require a 1-inch arbor. Retail miter saws are sold with an arbor and bevel. The bevel can be adjusted to cut wood at different angles.
The miter saw being for wood, the chop saw being for steel. I currently have a 10 miter saw with wood blades. But I needed to cut some rebar, so I put a 10 chop saw blade in. It's very slow going, but seems to work fine. It seems like a lot of people use the terms interchangeably.