刮(gua)(gua)(gua)(gua)研(yan)原始(shi)平(ping)(ping)(ping)板(ban)(ban)是采(cai)用(yong)(yong)循環(huan)刮(gua)(gua)(gua)(gua)研(yan)法,同(tong)時(shi)刮(gua)(gua)(gua)(gua)研(yan)三(san)塊(kuai)平(ping)(ping)(ping)板(ban)(ban),互相修正(zheng)(zheng),在(zai)刮(gua)(gua)(gua)(gua)研(yan)當中(zhong)不使用(yong)(yong)任何(he)量(liang)具(ju), 可以刮(gua)(gua)(gua)(gua)出三(san)塊(kuai) 的(de)平(ping)(ping)(ping)板(ban)(ban)。因此(ci)這(zhe)種方(fang)法對于(yu)沒有標(biao)準平(ping)(ping)(ping)板(ban)(ban)和高度量(liang)具(ju)的(de)工廠 適用(yong)(yong)。但是在(zai)實際(ji)刮(gua)(gua)(gua)(gua)研(yan)過(guo)程中(zhong),由(you)于(yu)循環(huan)合(he)研(yan)的(de)次(ci)序不合(he)適,往往需要過(guo)多(duo)的(de)合(he)研(yan)和修刮(gua)(gua)(gua)(gua)次(ci)數才能刮(gua)(gua)(gua)(gua)好。所以正(zheng)(zheng)確(que)掌(zhang)握循環(huan)方(fang)法是值得研(yan)究(jiu)的(de)一(yi)個問(wen)題。