坐標車床(chuang)鏜床(chuang)的(de)(de)定(ding)(ding)(ding)位(wei)精(jing)(jing)度(du)需求是比較(jiao)(jiao)高的(de)(de)，所以要檢(jian)(jian)查作(zuo)(zuo)(zuo)業臺(tai)或主軸箱在(zai)(zai)移(yi)動(dong)坐標定(ding)(ding)(ding)位(wei)后的(de)(de)定(ding)(ding)(ding)位(wei)差錯(cuo)。 國產(chan)各式坐標鏜床(chuang)的(de)(de)定(ding)(ding)(ding)位(wei)體系有光學體系和(he)機械體系（即絲杠和(he)校對尺(chi)(chi)）。選(xuan)用的(de)(de)定(ding)(ding)(ding)位(wei)體系雖不一(yi)樣，但定(ding)(ding)(ding)位(wei)差錯(cuo)的(de)(de)丈量辦法(fa)是一(yi)樣的(de)(de)。在(zai)(zai)機床(chuang)臺(tai)上，沿縱向移(yi)動(dong)方向放(fang)置一(yi)個精(jing)(jing)細(xi)的(de)(de)刻線(xian)(xian)尺(chi)(chi)（刻線(xian)(xian)尺(chi)(chi)的(de)(de)刻線(xian)(xian)精(jing)(jing)度(du)應(ying)帶差錯(cuo)檢(jian)(jian)定(ding)(ding)(ding)表，檢(jian)(jian)定(ding)(ding)(ding)精(jing)(jing)度(du)在(zai)(zai)0.0005mm以內），刻線(xian)(xian)尺(chi)(chi)放(fang)在(zai)(zai)作(zuo)(zuo)(zuo)業臺(tai)的(de)(de)基(ji)地(di)，高度(du)應(ying)在(zai)(zai)作(zuo)(zuo)(zuo)業臺(tai)面(mian)至筆(bi)直主軸端面(mian)較(jiao)(jiao)大間隔的(de)(de)l/3~l/2處。將讀(du)數顯微鏡(jing)（其讀(du)數精(jing)(jing)度(du)為0.001~0.002mm）固(gu)定(ding)(ding)(ding)在(zai)(zai)主軸套筒上，使顯微鏡(jing)能明(ming)晰地(di)觀察到刻線(xian)(xian)尺(chi)(chi)上的(de)(de)刻線(xian)(xian)，對作(zuo)(zuo)(zuo)業臺(tai)在(zai)(zai)規(gui)則(ze)長度(du)上的(de)(de)移(yi)動(dong)進行檢(jian)(jian)查（通常規(gui)則(ze)每移(yi)動(dong)l0mm讀(du)數一(yi)次(ci)）。在(zai)(zai)讀(du)數時(shi)(shi)，廠家作(zuo)(zuo)(zuo)業臺(tai)應(ying)夾(jia)緊(jin)。定(ding)(ding)(ding)位(wei)差錯(cuo)是恣(zi)意兩(liang)次(ci)定(ding)(ding)(ding)位(wei)時(shi)(shi)讀(du)數的(de)(de)實(shi)踐差值的(de)(de)大代(dai)數差。

坐(zuo)標鏜床(chuang)(chuang)(chuang)的(de)(de)定(ding)(ding)位(wei)(wei)精度需求(qiu)是比較高的(de)(de)，所以沈陽車床(chuang)(chuang)(chuang)進口要(yao)檢(jian)查作(zuo)(zuo)業(ye)(ye)臺(tai)或主(zhu)軸箱在(zai)(zai)移動(dong)坐(zuo)標定(ding)(ding)位(wei)(wei)后的(de)(de)定(ding)(ding)位(wei)(wei)差(cha)錯(cuo)。國(guo)產各式(shi)坐(zuo)標鏜床(chuang)(chuang)(chuang)的(de)(de)定(ding)(ding)位(wei)(wei)體(ti)系(xi)有光學體(ti)系(xi)（即絲(si)杠和校對(dui)尺(chi)）。選用的(de)(de)定(ding)(ding)位(wei)(wei)體(ti)系(xi)雖不一(yi)(yi)樣，但定(ding)(ding)位(wei)(wei)差(cha)錯(cuo)的(de)(de)丈(zhang)量辦法是一(yi)(yi)樣的(de)(de)。在(zai)(zai)機床(chuang)(chuang)(chuang)臺(tai)上，沿縱向(xiang)(xiang)移動(dong)方向(xiang)(xiang)放置(zhi)一(yi)(yi)個精細的(de)(de)刻(ke)線尺(chi)（刻(ke)線尺(chi)的(de)(de)刻(ke)線精度應(ying)(ying)帶差(cha)錯(cuo)檢(jian)定(ding)(ding)表，檢(jian)定(ding)(ding)精度在(zai)(zai)0.0005mm以內），刻(ke)線尺(chi)放在(zai)(zai)作(zuo)(zuo)業(ye)(ye)臺(tai)的(de)(de)基地，高度應(ying)(ying)在(zai)(zai)作(zuo)(zuo)業(ye)(ye)臺(tai)面至筆直主(zhu)軸端面較大間隔(ge)的(de)(de)l/3~l/2處。將讀(du)數(shu)(shu)(shu)顯微(wei)鏡(jing)（其讀(du)數(shu)(shu)(shu)精度為0.001~0.002mm）固定(ding)(ding)在(zai)(zai)主(zhu)軸套筒上，使顯微(wei)鏡(jing)能(neng)明晰地觀察到刻(ke)線尺(chi)上的(de)(de)刻(ke)線，對(dui)作(zuo)(zuo)業(ye)(ye)臺(tai)在(zai)(zai)規則長(chang)度上的(de)(de)移動(dong)進行檢(jian)查（通常規則每移動(dong)l0mm讀(du)數(shu)(shu)(shu)一(yi)(yi)次）。在(zai)(zai)讀(du)數(shu)(shu)(shu)時，作(zuo)(zuo)業(ye)(ye)臺(tai)應(ying)(ying)夾緊。定(ding)(ding)位(wei)(wei)差(cha)錯(cuo)是恣意兩次定(ding)(ding)位(wei)(wei)時讀(du)數(shu)(shu)(shu)的(de)(de)實(shi)踐(jian)差(cha)值的(de)(de)大代(dai)數(shu)(shu)(shu)差(cha)。

用光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)作比照檢(jian)查時(shi)，將一(yi)根(gen)兩(liang)頭(tou)(tou)帶莫氏錐(zhui)度(du)(du)(du)(du)(du)(du)的查驗(yan)棒(bang)，一(yi)端刺進光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)主(zhu)軸(zhou)錐(zhui)孔中(zhong)嚴密配合，另(ling)一(yi)端嚴密地刺進被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)主(zhu)軸(zhou)錐(zhui)孔中(zhong)，使兩(liang)個(ge)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)連(lian)成一(yi)體。被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)與光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)主(zhu)軸(zhou)基地不等(deng)高時(shi)應調整墊平。脫開(kai)光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)的手(shou)搖分(fen)(fen)度(du)(du)(du)(du)(du)(du)組織，滾(gun)動(dong)(dong)(dong)被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)的手(shou)柄(bing)，北京(jing)進口車床(chuang)使被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)滾(gun)動(dong)(dong)(dong)，一(yi)起經過查驗(yan)棒(bang)可股動(dong)(dong)(dong)光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)滾(gun)動(dong)(dong)(dong)。當被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)斷定(ding)(ding)在開(kai)始(shi)方(fang)位(wei)(wei)時(shi)，記下(xia)光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)滾(gun)動(dong)(dong)(dong)。當被(bei)檢(jian)分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)斷定(ding)(ding)在開(kai)始(shi)方(fang)位(wei)(wei)時(shi)，記下(xia)光學分(fen)(fen)度(du)(du)(du)(du)(du)(du)頭(tou)(tou)開(kai)始(shi)方(fang)位(wei)(wei)的讀數值。

東(dong)北橫(heng)(heng)(heng)梁移(yi)動時傾斜(xie)度差(cha)錯的(de)檢查(cha)辦法，在橫(heng)(heng)(heng)梁導軌的(de)基(ji)地(di)方(fang)位，平(ping)行(xing)于橫(heng)(heng)(heng)梁放置一個水(shui)平(ping)儀。移(yi)動橫(heng)(heng)(heng)梁，每隔500mm（或(huo)小(xiao)于500mm）記載一次(ci)讀數，在橫(heng)(heng)(heng)梁悉數行(xing)程上(shang)至(zhi)少記載3個讀數。在橫(heng)(heng)(heng)梁悉數行(xing)程上(shang)檢查(cha)時，兩筆直刀(dao)架（或(huo)銑頭）應(ying)移(yi)到橫(heng)(heng)(heng)梁上(shang)相對稱的(de)方(fang)位。而橫(heng)(heng)(heng)梁的(de)移(yi)動方(fang)向(xiang)，只(zhi)能(neng)由(you)下往上(shang)，不能(neng)往復。這種辦法多用于龍(long)門刨床(chuang)(chuang)、數控(kong)銑床(chuang)(chuang)、立式車(che)床(chuang)(chuang)等(deng)橫(heng)(heng)(heng)梁移(yi)動時的(de)傾斜(xie)度差(cha)錯的(de)檢查(cha)。