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在车削长度、直径比拟大的空心工件的内孔、端面时，需利用中间架。若是中间架调剂得不好，工件的轴心线和机床的主轴心线不重应时，加工中就会发生端面洼心和鼓肚及孔的锥度偏差。严峻时，工件从卡盘中脱出，形成变乱。
装置这类工件时．工件一端接纳三爪卡盘或四爪卡盘，另外一端，放在中间架上。而后在工件的孔中塞紧一块木板或在工件端面用黄油贴上一张纸，将尾座顶尖的 尖部靠在木板或纸面上，选用较低的主轴转速，使工件转一两周，这时候木板或纸面上被顶尖划出一个圆圈，再调剂中间架三个托，使圆圈的中间对正顶尖的尖部.
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