在泵类、阀类、电磁铁等产品的装配中,常常会碰到这样一类问题（见图1）,即需要通过选择件3的厚度来保证件1与件2之间的间隙（过盈）,由于这类间隙（过盈）对产品的性能影响很大,因此,必须精确地测量出这类间隙（过盈）以保证设计要求。1、常用方法配合间隙分为径向和轴向间隙。径向间隙一般采用直接测量法,即分别测出孔的尺寸D和轴的尺寸d,则径向间隙δ=D-d。而轴向间隙的测量就较为困难一些。轴向间隙常用间接测量法, In the assembly of pumps, valves, electromagnets and other products, one of the problems often encountered (see Figure 1) is the need to ensure that the gap between the parts 1 and 2 through the thickness of the option 3 Since such gaps (interference) have a significant impact on the performance of the product, such gaps must be accurately measured (interference) to ensure design requirements. 1, commonly used method with the gap is divided into radial and axial clearance. Radial clearance generally used direct measurement method, that is, respectively, measured the size of the hole D and the shaft size d, the radial clearance δ = D-d. The measurement of axial clearance is more difficult. Axial clearance commonly used indirect measurement method,