JB/T 10117.4-1999Parts and units of machine tool fixtures - Internal taper centres (English PDF)

1 Scope

This standard specifies inner taper hole centres with Morse tapers No. 4 and No. 5.

It applies to the front centre of lathes fitted with a pneumatic or hydraulic tailstock.

2 Normative references

The provisions contained in the following standards become provisions of this standard through reference in this standard. The editions shown were valid at the time of publication of this standard. All standards are subject to revision, and the parties using this standard should consider the possibility of applying the latest editions of the standards listed below.

GB/T 1298-1986 Specification for carbon tool steel

GB/T 1443-1996 Self-holding tapers for machine tool and tool shanks

JB/T 8044-1999 Technical requirements for the parts and units of jigs and fixtures

3 Dimensions

The dimensions are those shown in the figure and the table, in millimetres. The shank is a Morse taper with a surface roughness of Ra 0,8 µm; the inner taper hole has an included angle alpha and a surface roughness of Ra 1,6 µm, the end face being Ra 3,2 µm and the remaining surfaces Ra 12,5 µm. The run-out of the taper hole relative to the shank is within 0,02 mm. The overall length is L, the hole depth l, the outside diameter D, the locating diameter d and the hole diameter d1.