Transcription of What is a CNC Machine? CNC : Computerised Numerical ...
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WhatisaCNCM achine?CNC:ComputerisedNumericalControl( Computer+NumericalControl) Numericalcontrolisaprogrammableautomatio ninwhichprocessiscontrolledbyNumbers,Let ters,andsymbols. CNCM achiningisaprocessusedinthemanufacturing sectorthatinvolvestheuseofcomputerstocon trolmachinetoolslikelathes, Tomanufacturecomplexcurvedgeometriesin2 Dor3 Dwasextremelyexpensivebymechanicalmeans( whichusuallywouldrequirecomplexjigstocon trolthecuttermotions) MachiningcomponentswithhighRepeatability andPrecision Unmannedmachiningoperations Toimproveproductionplanningandtoincrease productivity However,sincethegrooveintheballscrewishe lical,itssteelballsrollalongthehelicalgr oove,and,then,theymaygooutoftheballnutun lesstheyarearrestedatacertainspot. Itconsistsofascrewspindle,anut,ballsandi ntegratedballreturnmechanismashowninFigu re. , configuration3 Thus,itisnecessarytochangetheirpathafter theyhavereachedacertainspotbyguidingthem ,oneafteranother,backtotheir startingpoint (formationofarecirculationpath).
• The motors used for CNC system are of two kinds Electrical - AC , DC or Stepper motors Fluid - Hydraulic or Pneumatic • In CNC, usually stepper and servo electrical drives are used • They exhibit favourable torque-speed characteristics and are relatively inexpensive. POWER DRIVES 25
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