单一切削循环指令内，外径切削循环 G80 指令
<DIV>＊ 单一切削循环指令（<FONT face="Times New Roman">G80</FONT>、<FONT face="Times New Roman">G81</FONT>、<FONT face="Times New Roman">G82 )<BR></FONT><FONT face="Times New Roman">1） </FONT>内、外径切削循<FONT face="Times New Roman">G8O</FONT>指令<BR><FONT face="Times New Roman">a </FONT>圆柱面的内、外径切削循<FONT face="Times New Roman">G80 X _ Z _ F _ ;</FONT></DIV><DIV align=center><FONT face="Times New Roman"><IMG height=338 src="http://www.chmcw.com/upload/news/RCL/13220_frykpc200769143125.jpg" width=429></FONT></DIV>
<DIV>见图<FONT face="Times New Roman">1</FONT>所示，执行该指令时，刀具从循环起点<FONT face="Times New Roman">A</FONT>开始，经<FONT face="Times New Roman">A</FONT>→<FONT face="Times New Roman">B</FONT>→<FONT face="Times New Roman">C</FONT>→<FONT face="Times New Roman">D</FONT>→<FONT face="Times New Roman">A</FONT>四段轨迹，其中<FONT face="Times New Roman">AB</FONT>、<FONT face="Times New Roman">DA</FONT>段按决速<FONT face="Times New Roman">R</FONT>移动：<FONT face="Times New Roman">BC</FONT>、<FONT face="Times New Roman">CD</FONT>段按指令速度<FONT face="Times New Roman">F</FONT>移动。<FONT face="Times New Roman">X</FONT>、<FONT face="Times New Roman">Z</FONT>值在绝对指令时为切削终点<FONT face="Times New Roman">C</FONT>的坐标值，在增量指令时，为切削终点<FONT face="Times New Roman">C</FONT>相对于循环起点<FONT face="Times New Roman">A</FONT>的移动距离。</DIV>
<DIV align=center><IMG height=300 src="http://www.chmcw.com/upload/news/RCL/13220_6g8ct6200769143216.jpg" width=389></DIV>
<DIV><FONT face="Times New Roman">b </FONT>带锥度的内、外径切削循环<FONT face="Times New Roman">GSO X __Z__l__F__;<BR></FONT>见图<FONT face="Times New Roman">2</FONT>，其中<FONT face="Times New Roman">X</FONT>、<FONT face="Times New Roman">Z</FONT>同上述一样，<FONT face="Times New Roman">I</FONT>值为切削始点日与切削终点<FONT face="Times New Roman">C</FONT>的半径差，即<FONT face="Times New Roman">r</FONT>始一<FONT face="Times New Roman"> r</FONT>终。当算术值为正时，取正值：为负时，<FONT face="Times New Roman">I</FONT>取负值。<BR>例如（见图<FONT face="Times New Roman">3)<BR></FONT><FONT face="Times New Roman">%1023<BR></FONT><FONT face="Times New Roman">N1 G54<BR></FONT><FONT face="Times New Roman">N2 M03<BR></FONT><FONT face="Times New Roman">N3 G90 G00 X40 Z50 F300<BR></FONT><FONT face="Times New Roman">N4 G80 X30 Z20 F300<BR></FONT><FONT face="Times New Roman">N5 G80 X27 Z20 F300<BR></FONT><FONT face="Times New Roman">N6 G80 X24 Z20 F300<BR></FONT><FONT face="Times New Roman">N7 M05<BR></FONT><FONT face="Times New Roman">N8 M30</FONT></DIV>
<DIV align=center><IMG height=348 src="http://www.chmcw.com/upload/news/RCL/13220_0ad8a0200769143241.jpg" width=386></DIV>
<DIV>例如（见图<FONT face="Times New Roman">4)<BR></FONT><FONT face="Times New Roman">%1024 H92 C40 X50<BR></FONT><FONT face="Times New Roman">N1 G91 G80 X</FONT>—<FONT face="Times New Roman">10 Z</FONT>—<FONT face="Times New Roman">30 1</FONT>—<FONT face="Times New Roman">5 F300 M03<BR></FONT><FONT face="Times New Roman">N2 G80 X</FONT>—<FONT face="Times New Roman">13 Z</FONT>—<FONT face="Times New Roman">30 1</FONT>—<FONT face="Times New Roman">5<BR></FONT><FONT face="Times New Roman">N3 G80 X</FONT>—<FONT face="Times New Roman">16 Z</FONT>—<FONT face="Times New Roman">30 1</FONT>—<FONT face="Times New Roman">5<BR></FONT><FONT face="Times New Roman">N4 M05<BR></FONT><FONT face="Times New Roman">N5 M30</FONT></DIV>
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