问答题
已知一梯形螺纹Tr60×18(P9)-8e的实际大径尺寸为声59.84mm，欲用单针测量，求量针直径dD和测量距A。
【正确答案】已知P=9mm、d=60mm、d0=59.84mm
dD=0.518P=0.518×9mm=4.662mm
d2=d-0.5P=60mm-0.5×9mm
=55.5mm
M=d2+4.864d0-1.866P
=55.5mm+4.864×4.662mm-1.866×9mm
=61.382mm
dD=0.518P=0.518×9mm=4.662mm
d2=d-0.5P=60mm-0.5×9mm
=55.5mm
M=d2+4.864d0-1.866P
=55.5mm+4.864×4.662mm-1.866×9mm
=61.382mm
【答案解析】