Selim Tevfik İLKER, 030060028, 3nd week

Feed rate: Feed rate is the velocity at which a tool is fed into a workpiece. Feedrates are expressed two ways: inches per minute of spindle travel and inches per revolution of the spindle. For milling applications, federates are generally given in inches per minute(ipm). For turning they are expressed most often in inches per revolution(ipr).

Feedrates are critical to the effectiveness of a job. Too heavy a feedrate will result in premature dulling and burning of tools. Feedrates which are to light will result in tool chipping. This chipping will rapidly lead to tool burning and brake.

(Warren S. Seames, Computer Numerical Control: Concepts and Programming pg. 72)

Generative Systems: A process plan is automaticlly generated on the basis of the same logical procedures that would be followed by a traditional process planner in making that particular part. However, the generative system is complex because it must contain comprehensive and detailed information of the part shape and dimensions; process capabilities; selection of manufacturing methods, machinery and tools: and the sequence of operations to be performed.

(Kalpakjian, Smith; Manufacturing Engineering and Technology,p. 1205)

Paperless Design: CAD systems are capable of rapidly and completely analyzing designs, from a simple bracket or a shaft, to large and complex structures. The two-engine Boeing 777 passenger airplane, for example was designed completely by computer, with 2000 workstations linked to eight design servers.

(Kalpakjian, Smith, Manufacturing Engineering and Technology,p. 13)

Chucks: Universal and independent chuks are used to hold the workpiece while it is being machined.

The jaws of a 3-way jaw chuck can be simultaneously moved an equal distance toward or away from the center, by turning a chuck key.

Because the 3-way chucks has one less jaw, it cannot grip the workpiece as tightly as 4-way jaw chuck. This type of chuck is best used for holding round stock. Another advantage of a 4-way jaw chuck is that the four jaws can be adjusted independently of each other. A workpiece that is either square,cylindirical or of irregular contour can be held securely and centered accurately.

(Harold V. Johnson, Manufacturing Process 2nd Edition, pg.262-263)