Bincika gazawar inda zoben riƙon ya 'kwafe' ko 'tasa' a ƙarƙashin kaya ba tare da fita daga ragi ba.

'Cupping' ko 'Dishing' wani nau'i ne na nakasar roba/robo inda sashin giciye na zobe ke murɗawa ƙarƙashin nauyin axial. Wannan yana faruwa lokacin da aka yi amfani da nauyin matsawa a wani wuri mai nisa daga goyon bayan tsagi (misali, a kan babban radius akan ɓangaren da aka riƙe). Zoben yana aiki kamar mai wanki na Belleville. Yayin da zoben bazai fita daga cikin tsagi ba, 'cupping' yana haifar da 'wasa' axial a cikin taron. Wannan wasan yana haifar da 'launi' ko tasirin tasirin lokacin aiki, wanda a ƙarshe yana haifar da gajiyar tsagi ko zoben kanta. Binciken gazawa ya ƙunshi auna kusurwar 'tasa'; Dindindin tasa yana nuna cewa damuwan lanƙwasawa ya zarce ma'auni na kayan: $\sigma_b = _x000c_rac{M imes c}{I} > \sigma_y$.