GB/T 5104-2008The basic types and dimensions of hobs for involute splines (English PDF)

Foreword

This Standard replaces GB/T 5104-2004 "The basic types and dimensions of hobs for 30 Degree pressure angle involute splines" and GB/T 5105-2004 "The basic types and dimensions of hobs for 45° pressure angle involute splines".

Compared with GB/T 5104-2004 and GB/T 5105-2004, this Standard has the following technical differences:

- Integrate GB/T 5104-2004 and GB/T 5105-2004.

Appendix A and Appendix B of this Standard are informative appendices.

1 Scope

This Standard specifies the basic types and dimensions of hobs for the overall involute splines with a modulus of 0.5 mm~10 mm and a pressure angle of 30° and of hobs for the overall involute splines with a modulus of 0.25 mm~2.50 mm and a pressure angle of 45°.

This Standard is applicable to hobs for straight cylindrical involute splines with machined basic rack profiles according to GB/T 3478.1 and dimensions according to GB/T 3478.4 or GB/T 3478.2.

A hob with a pressure angle of 30° is suitable for three accuracies of A, B, and C. A hob with a pressure angle of 45° is suitable for class C accuracy.

2 Normative references

The following documents contain provisions which, through reference in this Standard, constitute provisions of this Standard. For the dated references, their subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest editions of these documents are applicable. For undated reference documents, the latest editions apply to this Standard.

GB/T 3478.1 Straight cylindrical involute splines - Modules, basic rack profiles and tolerances (GB/T 3478.1-1995, eqv ISO 4156:1981)

GB/T 3478.2 Straight cylindrical involute splines - 30° pressure angle dimensions tables (GB/T 3478.2-1995, neq ISO 4156:1981)

GB/T 3478.4 Straight cylindrical involute splines - 45° pressure angle dimensions tables (GB/T 3478.4-1995, neq ISO 4156:1981)

GB/T 6132 Milling cutters interchangeability dimensions for cutter arbors (GB/T 6132-2006, ISO 240:1994, IDT)

3 Types and dimensions

3.1 The basic types of hob for involute spline with a pressure angle of 30° are divided into two: type I and type II. Type I is a flat-addendum hob, suitable for processing external splines of flat dedendum. Type II is a round-addendum hob, suitable for processing external splines of round dedendum.

3.2 The structure types and dimensions of hob for involute spline with a pressure angle of 30° are in accordance with Figure 1 and Table 1. The structure types and dimensions of hob for involute spline with a pressure angle of 45° are in accordance with Figure 1 and Table 2. See Appendix A for the calculation dimensions of the hob. See Appendix B for the axial dimensions of the hob.

3.3 The hob is made as a single-head right-handed (can be made as a left-handed according to user requirements). The chip pocket is a straight flute parallel to the hob axis.

3.4 The dimensions and tolerances of the spline are in accordance with GB/T 6132.

3.5 The diameter d1 of the pillow block is determined by the manufacturer itself. […]