Industrial Mechanics and Maintenance chain drives chapter 8 EXAM(Graded A+ actual test)

Roller chain - Most common chain Roller chians - Often used for timing or synchronizing part of machinery Roller chians - Are positive drive and have no slip but can have back lash. False - One disadvantage of a roller chain is that is not very efficient due to high friction Riveted and Cottered - Two types of roller chain constructions Riveted chain - Badder pins hold the side plates Cotter chain - Cotter keys Hold the side plates False - There is not set standards between Roller chain manufacturers so care must be taken when comparison chain sizes ANSI standards - Ensures that a replacement chain can be interchanged among the various manufacturers True - Heavy series chain is identified by placing a letter "H" FOLLOWING the chain number False - Adding a second strand to a chain can double its load capacity True - Heavy series chain runs on standard Series sprockets and uses the same horsepower rating.False - Double pitch roller chain CANNOT run on standard chain sprocket of the correct size Bushings - The rollers on a roller chain that come into contact with the sprocket teeth rotate on Master - Connecting links are also referred to as _______ link. Offset link - A special link that will allow a strand of chain to be assembled having an odd number of links is known as Spring clip - The two types of connecting links are _____ and cotter pin link. Self lubricating chain - A chain that uses oil impregnated bushings that release lubricant to all bearing Services during operation and then reabsorbs it when the drive is idle is known as Roller chain Pitch - Is determined by measuring the center distance between two pins. Double pitch roller - Can run on a standard roller chain sprocket Lubrication and Accurate Alignment - Are two key factors for long life of a chain drive Chain tension - May vary depending on chain size speed and application A drive with a 50 inch Center distance - Should deflect no more than 1 inch. 2% of 50 inch equal one inch. Heavy series chains - Is usually designated by the letter H following the same number and is usually manufactured and three quarter inch ( number 60 ) and larger pitches.Number of strands 2 - Strand Factor 1.7 Number of strands 3 - Strand Factor 2.5 Number of strands 4 - Strand Factor 3.3 Roller chain identification - Is a simple matter of measuring the pitch Roller chain pitch is determined by - Measuring the center distance between two pins