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某单位因测量一多孔组合件孔的直线度,需一根长600mm,直径8_(-0.05)~0mm,圆柱度0.03,表面粗糙度值R_α=1.6μm,材料45钢,热处理后硬度28～32HRC的测杆,见图1。该测杆的长径比 L/d为75。 1.轴套式跟刀架 根据工件细而长、刚性差的特点,我们制作了轴套式跟刀架。其由铜轴套、半圆铁和刀杆等组成,见图2。 将轴套式跟刀架装在车床刀架上,用百分表左右校正,即在垂直卡爪的方向,调整高低前后中心,调好后,将中托板、小托板及刀架紧固。然后,将已加工好一端的测杆（约100mm长）通过跟刀架轴套,用卡爪夹紧约10mm长,另一端用尾座拉紧。
For measuring the straightness of a hole in a porous assembly, a unit length of 600 mm, a diameter of 8 mm (-0.05) to 0 mm, a cylindricality of 0.03, a surface roughness of R_α = 1.6 μm, a material of 45, a hardness of 28 ~ 32HRC rod, shown in Figure 1. The rod’s aspect ratio L / d is 75. 1. Sleeve with the knife holder According to the workpiece thin and long, poor rigidity, we have made a sleeve-type with the knife holder. It consists of copper sleeve, semi-circular iron and Arbor and other components, shown in Figure 2. The sleeve with the turret mounted on the turret, with dial indicator around the correction, that is, in the direction of the vertical jaw, adjust the height before and after the center, adjusted, the pallet, pallet and knife tight solid. Then, the finished rod (about 100 mm in length) is passed through the tool holder bushing, clamped about 10 mm long and the other end is tightened with a tailstock.