<!-- .at_3{FONT-SIZE: 14pt; COLOR: black} .at_0{MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 27pt; mso-line-height-rule: exactly} .at_1{FONT-SIZE: 14pt; FONT-FAMILY: PMingLiU; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-TW} .at_2{FONT-SIZE: 14pt; mso-fareast-font-family: PMingLiU; mso-fareast-language: ZH-TW} -->主軸材料40Cr，齒管材料45號鋼，經調質：HRC20-23後再鍍硬鉻HV900；主軸內孔偏擺0.005mm以內；主軸軸承選用高精度P4級軸承。