Machine tool components Method for determination of the pilot diameter of 60° centre holes

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-12-1987

Publisher

British Standards Institution

Foreword
Committees responsible
Method
1. Scope
2. Symbols
3. Definitive equation
4. Procedure
5. Assessment of results
Appendices
A. Theoretical basis of calculation
B. Additional considerations
Tables
1. Specific cutting force ks for various common metals
2. Determination of d as a function of FG, Fs and
    sigma u for sigma u > 300 N/mm squared < 467 N/mm
    squared
3. Determination of d as a function of FG, Fs and
    sigma u for sigma u > 467 N/mm squared < 750 N/mm
    squared
4. Determination of d as a function of FG, Fs and
    sigma u for sigma u > 750 N/mm squared < 1183 N/mm
    squared
5. Determination of d as a function of FG, Fs and
    sigma u for sigma u > 1183 N/mm squared < 1867 N/mm
    squared
6. Values of the expression (De/Di) squared / ((De/Di)
    squared - 1) for values of De/Di between 1.5 and 10.0
Figures
1. Typical centre hole
2. Forces due to gravity for an asymmetrical workpiece
3. Projected area of centre, Ae

Applies to certain types of centre hole described in BS 328-2. Calculations apply to work pieces which are to be machined on centres providing they satisfy specified conditions.

This Part of BS 4185 describes a method for the determination of the pilot diameter, d, of a 60° centre hole, type A, B or R as illustrated in Appendices A to C of BS 328-2:1972, covering the range 0.5 mm ⩽ d ⩽ 50 mm. This method applies only to workpieces satisfying the following conditions: force acting at the centre hole, FG, ⩽ 180 000 N; cutting force, Fs, ⩽ 110 000 N; where ⩾ 3 or ⩾ 6.3 (see BS 328-1 for D in relation to d) (see also clause 2). NOTE 1 The theoretical concept is explained in Appendix A and additional considerations are given in Appendix B. NOTE 2 A typical centre hole is illustrated in Figure 1. NOTE 3 The titles of the publications referred to in this standard are listed on the inside back cover.

Committee	MTE/1
DevelopmentNote	Supersedes 84/71289 DC (07/2005) Reviewed and confirmed by BSI, October 2012. (09/2012)
DocumentType	Standard
Pages	18
PublisherName	British Standards Institution
Status	Current