. ▁It ▁can ▁also ▁be ▁ex ac erb ated ▁by ▁gr inding ▁when ▁the ▁wheel ▁is ▁not ▁under ▁power , ▁such ▁as ▁using ▁the ▁work ▁to ▁apply ▁bra king ▁action ▁to ▁the ▁wheel ▁to ▁stop ▁it ▁from ▁coast ing . ▁D ress ing ▁rest ores ▁the ▁round ness . ▁When ▁ben ch ▁gr ind ers ▁v ibr ate ▁excess ively , ▁it ▁is ▁usually ▁because ▁the ▁whe els ▁have ▁worn ▁out ▁of ▁round ▁and ▁are ▁thus ▁out ▁of ▁balance . ▁Tru ing ▁them ▁by ▁dress ing ▁resol ves ▁this ▁problem . ▁ ▁Dis l odge ▁these ▁ab ras ive ▁particles ▁to ▁expose ▁fresh ▁ab ras ive ▁from ▁the ▁wheel ' s ▁surface . ▁Each ▁ab ras ive ▁gra in ▁is ▁a ▁small ▁cutting ▁tool ; ▁a ▁worn ▁gra in ▁has ▁its ▁edges ▁d ul led ▁and ▁los es ▁its ▁effect iveness . ▁Ex pos ing ▁the ▁fresh ▁gra ins ▁is ▁thus ▁a ▁sh ar pen ing ▁process . ▁Gla zing ▁of ▁the ▁wheel ▁is ▁evidence ▁of ▁rounded ▁gra ins ▁and ▁is ▁notice able ▁by ▁a ▁reflect ive ▁surface ▁on ▁the ▁spin ning ▁wheel . ▁ ▁C lean ▁the ▁wheel . ▁If ▁a ▁work pie ce ▁is ▁so fter ▁than ▁the ▁grade ▁for ▁which ▁the ▁wheel ▁is ▁designed , ▁the ▁ab ras ive ▁particles ▁will ▁not ▁be ▁dis l od ged ▁in ▁time ▁to ▁present ▁fresh , ▁sharp ▁gra ins . ▁The ▁wheel ▁therefore ▁appears ▁to ▁lose ▁its ▁edge ▁especially ▁as ▁the ▁por es ▁between ▁gra ins ▁fill ▁with ▁fragments ▁of ▁the ▁work pie