Kev tho txawv yog hais txog kev ua haujlwm ntxiv ntawm forged, cam khwb cia lossis drilled qhov. Kev tho txawv tuaj yeem nthuav dav lub qhov taub, txhim kho qhov tseeb, txo qhov roughness ntawm qhov chaw, thiab tuaj yeem kho qhov deflection ntawm qhov qub qhov axis.
Kev tho txawv yog muab faib ua qhov dav dav thiab qhov tob qhov tho txawv. General tho txawv tuaj yeem ua rau ntawm lub tshuab dhos zoo tib yam. Cov cuab yeej tho txawv tuaj yeem kho tau ntawm tailstock ntawm lub tshuab dhos lossis ntawm cov cuab yeej me me. Qhov tob qhov tho txawv yuav tsum muaj qhov tshwj xeeb tob qhov drilling thiab tho txawv tshuab. Cov cuab yeej tho txawv yuav tsum tau nruab nrog lub boring qia, thiab lub twj tso kua mis hydraulic yuav tsum tau siv cov dej txias kom tshem tawm cov ntaub ntawv hlau.
