ANSI Device Numbers. From Wikipedia, the free encyclopedia. The ANSI Standard Device Numbers[1] [2] [3] denote what features a protective device supports (such as a. relay or circuit breaker). These types of devices protect electrical systems and components from damage when. an unwanted event occurs, such as an electrical fault.
The piston ring speed on the average chainsaw travels 2,500 surface feet per minute. A chain slides across the surface of the sawbar rail at around 5000 feet per minute. The chain is moving at 55 to 60 m.p.h. or a mile per minute (88 feet per second).
Typically, the 18 speeds are achieved by a combination of 3 front and 6 rear sprockets on the chain drive. Both the front and rear sprockets have chain shifting mechanisms with dedicated levers on the handlebars. Refer owner's manual how on how to achieve a specific gear.