AO202
AO202
AO202
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測(cè)量工具有標(biāo)準(zhǔn)轉(zhuǎn)臺(tái)、角度多面體、圓光柵及平行光管(準(zhǔn)直儀)等，可根據(jù)具體情況選用。測(cè)量方法是使工作臺(tái)正向(或反向)轉(zhuǎn)一個(gè)角度并停止、鎖緊、定位，以此位置作為基準(zhǔn)，然后向同方向快速轉(zhuǎn)動(dòng)工作臺(tái)，每隔30鎖緊定位，進(jìn)行測(cè)量。正向轉(zhuǎn)和反向轉(zhuǎn)各測(cè)量一周，各定位位置的實(shí)際轉(zhuǎn)角與理論值(指令值)之差的最大值為分度誤差。如果是數(shù)控回轉(zhuǎn)工作臺(tái)，應(yīng)以每30為一個(gè)目標(biāo)位置，對(duì)于每個(gè)目標(biāo)位置從正、反兩個(gè)方向進(jìn)行快速定位7次，實(shí)際達(dá)到位置與目標(biāo)位置之差即位置偏差，再按GB10931-89《數(shù)字控制機(jī)床位置精度的評(píng)定方法》規(guī)定的方法計(jì)算出平均位置偏差和標(biāo)準(zhǔn)偏差，所有平均位置偏差與標(biāo)準(zhǔn)偏差的最大值和與所有平均位置偏差與標(biāo)準(zhǔn)偏差的最小值的和之差值，就是數(shù)控回轉(zhuǎn)工作臺(tái)的定位精度誤差。
考慮干式變壓器到實(shí)際使用要求，一般對(duì)0、90、180、270等幾個(gè)直角等分點(diǎn)進(jìn)行重點(diǎn)測(cè)量，要求這些點(diǎn)的精度較其他角度位置提高一個(gè)等級(jí)。
6、回轉(zhuǎn)工作臺(tái)的重復(fù)分度精度檢測(cè)
測(cè)量方法是在回轉(zhuǎn)工作臺(tái)的一周內(nèi)任選三個(gè)位置重復(fù)定位3次，分別在正、反方向轉(zhuǎn)動(dòng)下進(jìn)行檢測(cè)。所有讀數(shù)值中與相應(yīng)位置的理論值之差的最大值分度精度。如果是數(shù)控回轉(zhuǎn)工作臺(tái)，要以每30取一個(gè)測(cè)量點(diǎn)作為目標(biāo)位置，分別對(duì)各目標(biāo)位置從正、反兩個(gè)方向進(jìn)行5次快速定位，測(cè)出實(shí)際到達(dá)的位置與目標(biāo)位置之差值，即位置偏差，再按GB10931-89規(guī)定的方法計(jì)算出標(biāo)準(zhǔn)偏差，各測(cè)量點(diǎn)的標(biāo)準(zhǔn)偏差中最大值的6倍，就是數(shù)控回轉(zhuǎn)工作臺(tái)的重復(fù)分度精度。
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