求翻译：（1）用塞尺检查，操作方法与用塞检查径向游隙的方法相同，但轴向游隙应为 c=λ/（2sinβ）式中c是什么意思？

(1) the examiner checks, methods of operation and check method of radial clearance of the same, but axial clearance should be c = λ/(2sin β) c--in an axial clearance, mm; λ--feeler gauge thickness, mm; beta-bearing cone angle, (°).