GB/T 5104-2008 English PDF (GBT5104-2008)

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GB/T 5104-2008: The basic types and dimensions of hobs for involute splines
GB/T 5104-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.100.20
J 41
Replacing GB/T 5104-2004, GB/T 5105-2004
The basic types and dimensions of hobs for involute
splines
ISSUED ON: AUGUST 28, 2008
IMPLEMENTED ON: MARCH 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Types and dimensions ... 5 
4 Marking examples ... 7 
Appendix A (Informative) Calculation dimensions of hob ... 8 
Appendix B (Informative) Axial rack profile dimensions of hob ... 10 
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.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
91 on Cutting Tools of Standardization Administration of China (SAC/TC 91).
Drafting organization of this Standard: Chongqing Tool Factory Co., Ltd.
Main drafters of this Standard: Dai Xin, Jiang Ning.
The previous editions of the standard replaced by this Standard were released
as follows:
- GB 5104-1985, GB/T 5104-2004;
- GB 5105-1985, GB/T 5105-2004.
The basic types and dimensions of hobs for involute
splines
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.