Roundness yog hais txog qib uas ib qho khoom nto deviates los ntawm lub voj voog, thiab feem ntau yog siv los piav txog cov yam ntxwv ntawm lub tog raj kheej lossis lub khob hliav qab. Roundness feem ntau yog qhia raws li qhov sib txawv ntawm txoj kab uas hla lossis lub vojvoog thiab yog ib qho kev ntsuas ntawm lub voj voog ntawm ib qho khoom nto.
Straightness yog hais txog qhov degree uas qhov saum npoo ntawm ib qho khoom sib txawv ntawm txoj kab ncaj nraim, thiab siv los piav txog cov yam ntxwv ntawm lub dav hlau lossis txoj kab ncaj nraim. Straightness feem ntau yog qhia raws li qhov sib txawv ntawm qhov deb thiab yog ib qho kev ntsuas ntawm qhov ncaj ntawm ib qho khoom nto.
Circular runout yog hais txog qhov tsis sib xws ntawm cov khoom sib hloov ntawm cov kabmob lossis lwm yam kev txhawb nqa thiab feem ntau yuav tsum tau tswj hwm hauv high-precision rotating machinery. Circular runout ua rau erratic lossis irregular motion ntawm ib yam khoom ntawm ib tug axis ntawm kev sib hloov raws li nws rotates.
