Gökhan Malakçı-030070802-1st Week

CNC

The sequencing and actuation of the motions on screw machines and chucking machines has traditionally been controlled by cams and other mechanical devices.The modern form of control is computer numerical control(CNC), in which the machine tool operations are controled by a program of instructions.CNC provides a more sophisticated and versatile means of control than mechanical devices.

(Mikell P.Groover "Fundamentals of modern manufacturing" Second edition,pages 508-509)

Notching

To obtain the desired outline of a blank, portion of the sheet metal are often removed by notching and seminotching.Notching involves cutting out a portion of metal from the side of the sheet or strip.Seminotching removes a portion of metal from the interior sheet.

(Mikell P.Groover "Fundamentals of modern manufacturing" Second edition,page 441)

Lead Time

The lead time for a jop is the time that must be allowed to complete the jop from start to finish.There are two kinds of lead times in MRP:oredering lead times and manufacturing lead times.Oredering lead time is the time required from initiation of the purchase requisition to receipt to the item from vendor.Manufacturing lead time is the time required to produce the item in the company's own plant, from order relaese to completion.

(Mikell P.Groover "Fundamentals of modern manufacturing" Second edition,page 935)

EDM

It is called electiric discharge machinig.Electric discharge material removal processes remove metal by a series of discrete electrical discharges(sparks) that cause localized temparatures high enough to melt or vaporize the metal in the immediate vicinity of the discahge.

(Mikell P.Groover "Fundamentals of modern manufacturing" Second edition,page 619-621)