切削加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)(de)對象是(shi)(shi)各(ge)種(zhong)(zhong)各(ge)樣(yang)(yang)的(de)(de)(de)(de)機(ji)(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)零件(jian)(jian)，而零件(jian)(jian)又是(shi)(shi)由一(yi)個個表(biao)(biao)面(mian)(mian)所(suo)(suo)組成(cheng)(cheng)(cheng)(cheng)，所(suo)(suo)以，具(ju)體(ti)切削的(de)(de)(de)(de)是(shi)(shi)形(xing)(xing)狀(zhuang)、位置、尺寸和(he)精度(du)等(deng)(deng)多(duo)樣(yang)(yang)化(hua)的(de)(de)(de)(de)表(biao)(biao)面(mian)(mian)。從形(xing)(xing)狀(zhuang)上，組成(cheng)(cheng)(cheng)(cheng)零件(jian)(jian)常見的(de)(de)(de)(de)表(biao)(biao)面(mian)(mian)有(you)平(ping)(ping)面(mian)(mian)、外(wai)圓(yuan)(yuan)面(mian)(mian)、內(nei)圓(yuan)(yuan)面(mian)(mian)、圓(yuan)(yuan)錐面(mian)(mian)、螺紋(wen)、齒(chi)(chi)形(xing)(xing)、成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)面(mian)(mian)和(he)各(ge)種(zhong)(zhong)溝槽(cao)等(deng)(deng)。如圖的(de)(de)(de)(de)零件(jian)(jian)就(jiu)是(shi)(shi)由外(wai)圓(yuan)(yuan)面(mian)(mian)、內(nei)圓(yuan)(yuan)面(mian)(mian)、外(wai)圓(yuan)(yuan)錐面(mian)(mian)、內(nei)圓(yuan)(yuan)錐面(mian)(mian)、外(wai)螺紋(wen)、內(nei)螺紋(wen)、直角槽(cao)、回(hui)轉槽(cao)、軸肩平(ping)(ping)面(mian)(mian)和(he)端(duan)平(ping)(ping)面(mian)(mian)等(deng)(deng)所(suo)(suo)組成(cheng)(cheng)(cheng)(cheng)。切削加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)就(jiu)是(shi)(shi)通(tong)過各(ge)種(zhong)(zhong)各(ge)樣(yang)(yang)的(de)(de)(de)(de)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)藝加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)出(chu)這些表(biao)(biao)面(mian)(mian)，從而形(xing)(xing)成(cheng)(cheng)(cheng)(cheng)一(yi)定要(yao)求的(de)(de)(de)(de)零件(jian)(jian)。一(yi)、機(ji)(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)的(de)(de)(de)(de)類(lei)型與(yu)基本構(gou)造金屬加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)機(ji)(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)簡稱機(ji)(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)是(shi)(shi)將金屬毛坯上的(de)(de)(de)(de)多(duo)余金屬變成(cheng)(cheng)(cheng)(cheng)切屑，使毛坯變成(cheng)(cheng)(cheng)(cheng)所(suo)(suo)需機(ji)(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)零件(jian)(jian)的(de)(de)(de)(de)機(ji)(ji)(ji)(ji)(ji)(ji)器(qi)。現代(dai)制造業所(suo)(suo)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)(de)機(ji)(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)零件(jian)(jian)特別是(shi)(shi)精密機(ji)(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)零件(jian)(jian)的(de)(de)(de)(de)主要(yao)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)方法是(shi)(shi)切削加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)，切削加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)占機(ji)(ji)(ji)(ji)(ji)(ji)器(qi)總制造量(liang)(liang)的(de)(de)(de)(de)50%左(zuo)右，機(ji)(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)制造業的(de)(de)(de)(de)水平(ping)(ping)直接影(ying)響了(le)機(ji)(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)制造業的(de)(de)(de)(de)產品質量(liang)(liang)和(he)勞動(dong)(dong)效率等(deng)(deng)。實際生產中需要(yao)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)(de)工(gong)(gong)(gong)件(jian)(jian)種(zhong)(zhong)類(lei)繁多(duo)，其形(xing)(xing)狀(zhuang)、結(jie)構(gou)、尺寸、精度(du)、表(biao)(biao)面(mian)(mian)質量(liang)(liang)和(he)數量(liang)(liang)等(deng)(deng)各(ge)不相同。為了(le)滿足(zu)不同加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)(de)需要(yao)，機(ji)(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)的(de)(de)(de)(de)品種(zhong)(zhong)和(he)規格也應多(duo)種(zhong)(zhong)多(duo)樣(yang)(yang)。各(ge)有(you)特點，但它們在結(jie)構(gou)、運動(dong)(dong)及自動(dong)(dong)化(hua)等(deng)(deng)方面(mian)(mian)有(you)許多(duo)類(lei)似之處，也有(you)著共同的(de)(de)(de)(de)原理及規律。刀齒(chi)(chi)容易(yi)出(chu)現徑向(xiang)跳動(dong)(dong)，這將造成(cheng)(cheng)(cheng)(cheng)刀齒(chi)(chi)負荷不等(deng)(deng)，磨(mo)損不均勻，影(ying)響已加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)表(biao)(biao)面(mian)(mian)質量(liang)(liang)。嘉善硬質機(ji)(ji)(ji)(ji)(ji)(ji)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)刀具(ju)選擇

內(nei)徑(jing)百(bai)分(fen)(fen)表用(yong)(yong)來(lai)測(ce)量(liang)圓柱(zhu)孔，它附有(you)成套的(de)可調(diao)測(ce)量(liang)頭，使(shi)用(yong)(yong)前必須先進(jin)行組合和校對零(ling)位(wei)。組合時(shi)(shi)，將百(bai)分(fen)(fen)表裝入(ru)連(lian)桿(gan)內(nei)，使(shi)小指針(zhen)(zhen)指在0~1的(de)位(wei)置上(壓縮(suo)百(bai)分(fen)(fen)表半圈)，長針(zhen)(zhen)和連(lian)桿(gan)軸(zhou)線重合，刻度盤(pan)上的(de)字應垂直向下，以便(bian)于測(ce)量(liang)時(shi)(shi)觀察，裝好后應予緊固。測(ce)量(liang)前應根據被(bei)測(ce)孔徑(jing)大小用(yong)(yong)外徑(jing)百(bai)分(fen)(fen)尺(chi)(chi)調(diao)整好尺(chi)(chi)寸(cun)后才能使(shi)用(yong)(yong)。在調(diao)整尺(chi)(chi)寸(cun)時(shi)(shi)，正(zheng)確選用(yong)(yong)可換測(ce)頭的(de)長度及其伸出(chu)距離，應使(shi)被(bei)測(ce)尺(chi)(chi)寸(cun)在活(huo)動測(ce)頭總移動量(liang)的(de)中間位(wei)置。測(ce)量(liang)時(shi)(shi)，連(lian)桿(gan)中心(xin)線應與工件中心(xin)線平行，不得(de)歪(wai)斜(xie)，同時(shi)(shi)應在圓周上多(duo)測(ce)幾個點(dian)(dian)，找出(chu)孔徑(jing)的(de)實際尺(chi)(chi)寸(cun)，看是否在公差(cha)范圍以內(nei)。紹興耐用(yong)(yong)機加工刀具(ju)收(shou)費硬質合金焊接車刀優點(dian)(dian)是結構簡單，制造方便(bian)，可以根據需要進(jin)行刃磨，用(yong)(yong)靈活(huo)，刀具(ju)剛性好。

整體(ti)式(shi):刀(dao)(dao)體(ti)和刀(dao)(dao)齒(chi)(chi)是(shi)制成(cheng)(cheng)(cheng)一體(ti)的(de)(de)(de)(de)(de)(de)。制造(zao)比較簡便，但是(shi)大(da)型的(de)(de)(de)(de)(de)(de)銑(xian)刀(dao)(dao)一般不(bu)做(zuo)(zuo)成(cheng)(cheng)(cheng)這種(zhong)(zhong)的(de)(de)(de)(de)(de)(de)，因為比較浪費材(cai)料。焊接式(shi):刀(dao)(dao)齒(chi)(chi)用(yong)(yong)硬(ying)質合金或(huo)其(qi)他(ta)耐磨(mo)刀(dao)(dao)具材(cai)料制成(cheng)(cheng)(cheng),并(bing)釬(han)焊在(zai)刀(dao)(dao)體(ti)上。鑲(xiang)(xiang)齒(chi)(chi)式(shi):這種(zhong)(zhong)銑(xian)刀(dao)(dao)的(de)(de)(de)(de)(de)(de)刀(dao)(dao)體(ti)是(shi)普通鋼(gang)(gang)料做(zuo)(zuo)成(cheng)(cheng)(cheng)，而把工具鋼(gang)(gang)的(de)(de)(de)(de)(de)(de)刀(dao)(dao)片(pian)(pian)(pian)鑲(xiang)(xiang)到刀(dao)(dao)身上去。大(da)型的(de)(de)(de)(de)(de)(de)銑(xian)刀(dao)(dao)多半采用(yong)(yong)這種(zhong)(zhong)方法(fa)。用(yong)(yong)鑲(xiang)(xiang)齒(chi)(chi)法(fa)制造(zao)銑(xian)刀(dao)(dao)可以(yi)節省工具鋼(gang)(gang)材(cai)料，同時萬(wan)一有一個(ge)刀(dao)(dao)齒(chi)(chi)用(yong)(yong)壞，還可以(yi)拆下來重(zhong)新換一個(ge)好(hao)的(de)(de)(de)(de)(de)(de)，不(bu)必整個(ge)銑(xian)刀(dao)(dao)。但是(shi)小尺寸的(de)(de)(de)(de)(de)(de)銑(xian)刀(dao)(dao)因為地(di)位(wei)有限，不(bu)能(neng)利用(yong)(yong)鑲(xiang)(xiang)齒(chi)(chi)的(de)(de)(de)(de)(de)(de)方法(fa)。可轉(zhuan)位(wei)式(shi):將(jiang)(jiang)能(neng)轉(zhuan)位(wei)使用(yong)(yong)的(de)(de)(de)(de)(de)(de)多邊形刀(dao)(dao)片(pian)(pian)(pian)用(yong)(yong)機(ji)械方法(fa)夾固(gu)在(zai)刀(dao)(dao)桿或(huo)刀(dao)(dao)體(ti)上的(de)(de)(de)(de)(de)(de)銑(xian)刀(dao)(dao)。在(zai)切削加工中,當一個(ge)刃尖磨(mo)鈍(dun)后,將(jiang)(jiang)刀(dao)(dao)片(pian)(pian)(pian)轉(zhuan)位(wei)后使用(yong)(yong)另外的(de)(de)(de)(de)(de)(de)刃尖，這種(zhong)(zhong)刀(dao)(dao)片(pian)(pian)(pian)用(yong)(yong)鈍(dun)后不(bu)再重(zhong)磨(mo)。可轉(zhuan)位(wei)式(shi)銑(xian)刀(dao)(dao)和其(qi)它種(zhong)(zhong)類的(de)(de)(de)(de)(de)(de)銑(xian)刀(dao)(dao)相比有以(yi)下優(you)點(dian)(dian):①避免了硬(ying)質合金釬(han)焊時容易產生裂紋的(de)(de)(de)(de)(de)(de)缺(que)點(dian)(dian);②可轉(zhuan)位(wei)刀(dao)(dao)片(pian)(pian)(pian)適(shi)合用(yong)(yong)氣相沉積法(fa)在(zai)硬(ying)質合金刀(dao)(dao)片(pian)(pian)(pian)表面沉積薄層更硬(ying)的(de)(de)(de)(de)(de)(de)材(cai)料(碳化(hua)鈦、氮化(hua)鈦和氧(yang)化(hua)鋁),以(yi)提高切削性(xing)能(neng);③換刀(dao)(dao)時間(jian)短;④由(you)于(yu)可轉(zhuan)位(wei)刀(dao)(dao)片(pian)(pian)(pian)是(shi)標準化(hua)和集中生產的(de)(de)(de)(de)(de)(de),刀(dao)(dao)片(pian)(pian)(pian)幾何參數易于(yu)一致,切屑控(kong)制穩(wen)定。

螺線齒(chi)這(zhe)(zhe)種(zhong)銑(xian)(xian)刀(dao)(dao)(dao)有左手(shou)和右手(shou)的(de)(de)區別，如圖(tu)所示(shi)。由(you)于刀(dao)(dao)(dao)齒(chi)是(shi)斜繞在刀(dao)(dao)(dao)身(shen)上(shang)的(de)(de)，在加(jia)工(gong)(gong)(gong)時(shi)，前(qian)面(mian)(mian)的(de)(de)齒(chi)還沒(mei)有離開，后(hou)(hou)面(mian)(mian)的(de)(de)齒(chi)就已經(jing)開始切(qie)削(xue)。這(zhe)(zhe)樣在加(jia)工(gong)(gong)(gong)時(shi)就不會(hui)發生(sheng)震動(dong)，加(jia)工(gong)(gong)(gong)表面(mian)(mian)也就會(hui)光些。·尖齒(chi)銑(xian)(xian)刀(dao)(dao)(dao)這(zhe)(zhe)種(zhong)銑(xian)(xian)刀(dao)(dao)(dao)容易制造，因(yin)此應(ying)用也很廣。銑(xian)(xian)刀(dao)(dao)(dao)的(de)(de)刀(dao)(dao)(dao)齒(chi)用鈍以后(hou)(hou)是(shi)在工(gong)(gong)(gong)具磨(mo)床上(shang)用砂輪磨(mo)刀(dao)(dao)(dao)齒(chi)的(de)(de)后(hou)(hou)刀(dao)(dao)(dao)面(mian)(mian)，前(qian)刀(dao)(dao)(dao)面(mian)(mian)在制作西倒是(shi)已經(jing)做好了，不需再磨(mo)。2、鏟齒(chi)銑(xian)(xian)刀(dao)(dao)(dao)這(zhe)(zhe)種(zhong)銑(xian)(xian)刀(dao)(dao)(dao)的(de)(de)后(hou)(hou)刀(dao)(dao)(dao)面(mian)(mian)不是(shi)平的(de)(de)，而是(shi)曲線的(de)(de)。后(hou)(hou)刀(dao)(dao)(dao)面(mian)(mian)是(shi)在鏟齒(chi)車床上(shang)做出來的(de)(de)。鏟齒(chi)銑(xian)(xian)刀(dao)(dao)(dao)用鈍以后(hou)(hou)，只(zhi)需磨(mo)前(qian)刀(dao)(dao)(dao)面(mian)(mian)，而不需磨(mo)后(hou)(hou)刀(dao)(dao)(dao)面(mian)(mian)。這(zhe)(zhe)種(zhong)銑(xian)(xian)刀(dao)(dao)(dao)的(de)(de)特點就是(shi)在磨(mo)前(qian)刀(dao)(dao)(dao)面(mian)(mian)時(shi)不影(ying)響刀(dao)(dao)(dao)齒(chi)的(de)(de)形狀。機械(xie)加(jia)工(gong)(gong)(gong)成套的(de)(de)加(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)藝對大小型孔及其形狀的(de)(de)簡單(dan)或(huo)復(fu)雜程度沒(mei)有明(ming)顯(xian)的(de)(de)區別。

量(liang)(liang)(liang)具(ju)(ju)(ju)的(de)種(zhong)類(lei)(lei)很多，根據(ju)其用途和特點不同，可(ke)(ke)以分(fen)(fen)為:1.量(liang)(liang)(liang)具(ju)(ju)(ju):這類(lei)(lei)量(liang)(liang)(liang)具(ju)(ju)(ju)一(yi)(yi)般都(dou)有刻度(du)(du)，在其測(ce)(ce)量(liang)(liang)(liang)范圍內(nei)可(ke)(ke)以直(zhi)接測(ce)(ce)出(chu)零件(jian)和產(chan)品形狀及尺寸(cun)(cun)(cun)的(de)具(ju)(ju)(ju)體數值。如(ru)游標卡尺、千分(fen)(fen)尺、百分(fen)(fen)表和角度(du)(du)尺等(deng)(deng)。2.量(liang)(liang)(liang)具(ju)(ju)(ju):這類(lei)(lei)量(liang)(liang)(liang)具(ju)(ju)(ju)不能(neng)測(ce)(ce)量(liang)(liang)(liang)出(chu)實(shi)際尺寸(cun)(cun)(cun)，只能(neng)測(ce)(ce)定(ding)零件(jian)和產(chan)品的(de)形狀、尺寸(cun)(cun)(cun)是否合格，如(ru)卡規、塞規等(deng)(deng)。3.標準(zhun)量(liang)(liang)(liang)快:這類(lei)(lei)量(liang)(liang)(liang)具(ju)(ju)(ju)只能(neng)制成某一(yi)(yi)固(gu)定(ding)尺寸(cun)(cun)(cun)，通(tong)常用來校對和調(diao)整其它(ta)量(liang)(liang)(liang)具(ju)(ju)(ju)，也(ye)可(ke)(ke)以作為標準(zhun)與被測(ce)(ce)量(liang)(liang)(liang)件(jian)進行比(bi)較，如(ru)量(liang)(liang)(liang)塊、角度(du)(du)量(liang)(liang)(liang)塊。三(san)、量(liang)(liang)(liang)具(ju)(ju)(ju)(一(yi)(yi))游標卡尺游標卡尺如(ru)圖所示，是一(yi)(yi)種(zhong)比(bi)較精密的(de)通(tong)用量(liang)(liang)(liang)具(ju)(ju)(ju)，可(ke)(ke)以直(zhi)接測(ce)(ce)量(liang)(liang)(liang)工(gong)件(jian)的(de)內(nei)徑、外徑、寬度(du)(du)、長度(du)(du)、厚度(du)(du)、深(shen)度(du)(du)及中心距等(deng)(deng)。切(qie)削加(jia)工(gong)屬(shu)于機械加(jia)工(gong)中的(de)精加(jia)工(gong)處理環節(jie)，一(yi)(yi)般指用手持(chi)刀具(ju)(ju)(ju)或機床刀具(ju)(ju)(ju)從金屬(shu)零件(jian)上切(qie)削多余材料的(de)過(guo)程。平湖(hu)機械機加(jia)工(gong)刀具(ju)(ju)(ju)技(ji)術

由于硬質(zhi)合金刀片和刀桿材料的(de)線膨脹(zhang)系數不(bu)同，當焊接工藝不(bu)合理時(shi)易導(dao) 致硬質(zhi)合金產生裂紋。嘉善(shan)硬質(zhi)機加工刀具(ju)選(xuan)擇

如(ru)微(wei)(wei)(wei)分(fen)筒端面與(yu)(yu)下刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)之(zhi)間有(you)一條上(shang)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)，測(ce)量結(jie)(jie)果(guo)(guo)應(ying)為下刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)的(de)(de)數(shu)(shu)(shu)值(zhi)加上(shang)，再加上(shang)可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)的(de)(de)值(zhi)。1、先(xian)讀(du)(du)固定刻(ke)(ke)(ke)(ke)(ke)度(du)(du)2、再讀(du)(du)半(ban)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)，若(ruo)半(ban)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)已露(lu)出(chu)，記(ji)(ji)作(zuo)；若(ruo)半(ban)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)未露(lu)出(chu)，記(ji)(ji)作(zuo)；3、再讀(du)(du)可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)（注意(yi)估讀(du)(du)）。記(ji)(ji)作(zuo)n×；4、終讀(du)(du)數(shu)(shu)(shu)結(jie)(jie)果(guo)(guo)為固定刻(ke)(ke)(ke)(ke)(ke)度(du)(du)+半(ban)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)+可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)+估讀(du)(du)由于螺(luo)旋測(ce)微(wei)(wei)(wei)器(qi)的(de)(de)讀(du)(du)數(shu)(shu)(shu)結(jie)(jie)果(guo)(guo)精確到(dao)以mm為單(dan)位千(qian)分(fen)位，故螺(luo)旋測(ce)微(wei)(wei)(wei)器(qi)又叫(jiao)千(qian)分(fen)尺。外徑千(qian)分(fen)尺的(de)(de)零(ling)(ling)誤(wu)(wu)(wu)差的(de)(de)判定校(xiao)準好(hao)的(de)(de)千(qian)分(fen)尺，當測(ce)微(wei)(wei)(wei)螺(luo)桿與(yu)(yu)測(ce)砧接觸后，可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)上(shang)的(de)(de)零(ling)(ling)線(xian)(xian)(xian)與(yu)(yu)固定刻(ke)(ke)(ke)(ke)(ke)度(du)(du)上(shang)的(de)(de)水平(ping)橫(heng)線(xian)(xian)(xian)應(ying)該(gai)是對(dui)齊的(de)(de)。如(ru)果(guo)(guo)沒有(you)對(dui)齊，測(ce)量時就會產生系(xi)統誤(wu)(wu)(wu)差──零(ling)(ling)誤(wu)(wu)(wu)差。如(ru)無法消除零(ling)(ling)誤(wu)(wu)(wu)差，則應(ying)考慮它(ta)們對(dui)讀(du)(du)數(shu)(shu)(shu)的(de)(de)影響。若(ruo)可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)的(de)(de)零(ling)(ling)線(xian)(xian)(xian)在水平(ping)橫(heng)線(xian)(xian)(xian)上(shang)方(fang)，且第(di)x條刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)與(yu)(yu)橫(heng)線(xian)(xian)(xian)對(dui)齊，即說明(ming)測(ce)量時的(de)(de)讀(du)(du)數(shu)(shu)(shu)要(yao)比真實值(zhi)小，這(zhe)種(zhong)零(ling)(ling)誤(wu)(wu)(wu)差叫(jiao)做(zuo)負零(ling)(ling)誤(wu)(wu)(wu)差；若(ruo)可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)的(de)(de)零(ling)(ling)線(xian)(xian)(xian)在水平(ping)橫(heng)線(xian)(xian)(xian)的(de)(de)下方(fang)，且第(di)y條刻(ke)(ke)(ke)(ke)(ke)度(du)(du)線(xian)(xian)(xian)與(yu)(yu)橫(heng)線(xian)(xian)(xian)對(dui)齊，則說明(ming)測(ce)量時的(de)(de)讀(du)(du)數(shu)(shu)(shu)要(yao)比真實值(zhi)大，這(zhe)種(zhong)零(ling)(ling)誤(wu)(wu)(wu)差叫(jiao)正零(ling)(ling)誤(wu)(wu)(wu)差。>對(dui)于存在零(ling)(ling)誤(wu)(wu)(wu)差的(de)(de)千(qian)分(fen)尺，測(ce)量結(jie)(jie)果(guo)(guo)應(ying)等(deng)于讀(du)(du)數(shu)(shu)(shu)減(jian)去零(ling)(ling)誤(wu)(wu)(wu)差，即物體長度(du)(du)＝固定刻(ke)(ke)(ke)(ke)(ke)度(du)(du)讀(du)(du)數(shu)(shu)(shu)＋可(ke)動(dong)(dong)刻(ke)(ke)(ke)(ke)(ke)度(du)(du)讀(du)(du)數(shu)(shu)(shu)－零(ling)(ling)誤(wu)(wu)(wu)差。使(shi)用千(qian)分(fen)尺注意(yi)事項1．千(qian)分(fen)尺是一種(zhong)精密的(de)(de)量具，使(shi)用時應(ying)小心謹慎，動(dong)(dong)作(zuo)輕(qing)緩，不要(yao)讓它(ta)受到(dao)打擊和碰撞(zhuang)。千(qian)分(fen)尺內的(de)(de)螺(luo)紋非常精密。嘉善硬質機加工刀具選擇

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