使用(yong)千分尺時先(xian)(xian)要檢查(cha)其(qi)零(ling)(ling)位(wei)是(shi)(shi)否(fou)校準(zhun),因此先(xian)(xian)松開鎖緊裝置(zhi),**油(you)污(wu),特別(bie)是(shi)(shi)測(ce)(ce)砧與(yu)測(ce)(ce)微螺(luo)桿(gan)間(jian)接觸(chu)面(mian)要清洗干凈。檢查(cha)微分筒的(de)(de)(de)端面(mian)是(shi)(shi)否(fou)與(yu)固定(ding)套管(guan)上的(de)(de)(de)零(ling)(ling)刻(ke)度線重(zhong)(zhong)(zhong)合(he),若不(bu)(bu)重(zhong)(zhong)(zhong)合(he)應先(xian)(xian)旋(xuan)轉旋(xuan)鈕,直至(zhi)螺(luo)桿(gan)要接近測(ce)(ce)砧時,旋(xuan)轉測(ce)(ce)力裝置(zhi),當螺(luo)桿(gan)剛好與(yu)測(ce)(ce)砧接觸(chu)時會聽到喀喀聲,這時停止(zhi)轉動。如兩零(ling)(ling)線仍不(bu)(bu)重(zhong)(zhong)(zhong)合(he)(兩零(ling)(ling)線重(zhong)(zhong)(zhong)合(he)的(de)(de)(de)標志是(shi)(shi):微分筒的(de)(de)(de)端面(mian)與(yu)固定(ding)刻(ke)度的(de)(de)(de)零(ling)(ling)線重(zhong)(zhong)(zhong)合(he),且可動刻(ke)度的(de)(de)(de)零(ling)(ling)線與(yu)固定(ding)刻(ke)度的(de)(de)(de)水平橫(heng)線重(zhong)(zhong)(zhong)合(he)),可將(jiang)固定(ding)套管(guan)上的(de)(de)(de)小螺(luo)絲(si)松動,用(yong)專用(yong)扳手調(diao)節套管(guan)的(de)(de)(de)位(wei)置(zhi),使兩零(ling)(ling)線對(dui)齊,再把小螺(luo)絲(si)擰緊。不(bu)(bu)同(tong)廠家生(sheng)產的(de)(de)(de)千分尺的(de)(de)(de)調(diao)零(ling)(ling)方(fang)法不(bu)(bu)一樣(yang),這里僅是(shi)(shi)其(qi)中一種調(diao)零(ling)(ling)的(de)(de)(de)方(fang)法。
檢查千分尺零位是(shi)否校準(zhun)時(shi),要使螺桿和測砧(zhen)(zhen)接觸,偶爾會發生向(xiang)后旋轉測力(li)裝置(zhi)兩者不(bu)分離的情形(xing)。這時(shi)可用左(zuo)手手心用力(li)頂(ding)住尺架上測砧(zhen)(zhen)的左(zuo)側,右手手心頂(ding)住測力(li)裝置(zhi),再用手指(zhi)沿逆時(shi)針方向(xiang)旋轉旋鈕,可以使螺桿和測砧(zhen)(zhen)分開。
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