▁in ▁through - feed ▁gr inding ▁is ▁cant ed ▁away ▁from ▁the ▁plane ▁of ▁the ▁gr inding ▁wheel ▁in ▁such ▁a ▁way ▁as ▁to ▁provide ▁an ▁ax ial ▁force ▁component , ▁feed ing ▁the ▁work pie ce ▁through ▁between ▁the ▁two ▁whe els . ▁Through - feed ▁gr inding ▁can ▁be ▁very ▁efficient ▁because ▁it ▁does ▁not ▁require ▁a ▁separate ▁feed ▁mechanism ; ▁however , ▁it ▁can ▁only ▁be ▁used ▁for ▁parts ▁with ▁a ▁simple ▁cyl ind rical ▁shape . ▁ ▁End - feed ▁In ▁end - feed ▁center less ▁gr inding , ▁the ▁work pie ce ▁is ▁fed ▁ax ial ly ▁into ▁the ▁machine ▁on ▁one ▁side ▁and ▁comes ▁to ▁rest ▁against ▁an ▁end ▁stop ; ▁the ▁gr inding ▁operation ▁is ▁performed , ▁and ▁then ▁the ▁work pie ce ▁is ▁fed ▁in ▁the ▁opposite ▁direction ▁to ▁exit ▁the ▁machine . ▁End - feed ▁gr inding ▁is ▁best ▁for ▁t aper ed ▁work pie ces . ▁ ▁In - feed ▁In - feed ▁center less ▁gr inding ▁is ▁used ▁to ▁gr ind ▁work pie ces ▁with ▁relatively ▁complex ▁shapes , ▁such ▁as ▁an ▁hour glass ▁shape . ▁Before ▁the ▁process ▁begins , ▁the ▁work pie ce ▁is ▁loaded ▁manually ▁into ▁the ▁gr inding ▁machine ▁and ▁the ▁reg ulating ▁wheel ▁is ▁moved ▁into ▁place . ▁The ▁complexity ▁of ▁the ▁part ▁shapes ▁and ▁gr inding ▁wheel ▁shapes ▁required ▁to ▁gr ind ▁them ▁accur ately ▁prevent ▁the ▁work pie ce ▁from ▁being ▁fed ▁ax ial ly ▁through ▁the ▁machine . ▁ ▁Equ ip ment ▁ ▁Center