在测量大型零件的直径(有时大达2米多)以及在大型零件上测量高精度公差尺寸时,如果没有合适的外径千分尺,要测量这类零件的外径是困难的。而制作一种如图所示的专用测量工具,问题便迎刃而解了。用一根磨光的,长度合适的铝管,在铝管的一端装上一只千分表,另一端装上一件可调整的夹紧式测砧,测砧的内孔和两端面加工成直角,以保证其垂直度。然后在测砧的一端铣一条槽子,使测砧既能沿铝管方便地滑动,又可以用内六角螺钉把测砧牢固地夹紧在铝管上。这样就制成了一套轻 Measuring the diameter of large parts (sometimes as large as 2 meters) and measuring high-precision tolerances on large parts can make it difficult to measure the outside diameter of such parts without a suitable outer diameter micrometer. The production of a special measurement tool as shown, the problem will be solved. A polished aluminum tube of suitable length is fitted with a dial gauge at one end of the aluminum tube and an adjustable clamp-type anvil at the other end to machine the inner bore and the two end faces of the anvil At right angles, to ensure its verticality. Then milling a groove at one end of the test anvil so that the test anvil can slide easily along the aluminum tube, and the anvil can be firmly clamped to the aluminum pipe with the socket head cap screw. This made a light set