1、BRITISH STANDARD BS 4656-35: 1987 ISO 6155-2: 1986 Accuracy of machine tools and methods of test Part 35: Specification for capstan, turret and automatic lathes, single spindle type less than 25 mm diameter capacity ISO title: Acceptance conditions for horizontal spindle capstan, turret and single s
2、pindle automatic lathes Testing of the accuracy Part 2: Machinable bar diameters 25 mm or less and chuck diameter up to 160 mm. UDC 621.9.01187.001.4:621.941.23BS4656-35:1987 This British Standard, having been prepared under the directionof the Machine, Engineers and Hand Tools Standards Committee,
3、was published under the authorityofthe Board of BSIandcomes intoeffect on 30November1987 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MTE/1 Draft for comment 85/73680 DC ISBN 0 580 16239 7 Committees responsible for this British Standard The prepa
4、ration of this British Standard was entrusted by the Machine, Engineers and Hand Tools Standards Committee (MTE/-) to Technical Committee MTE/1 upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute Cranfield Institute of Technology Department of Trade
5、 and Industry Mechanical Engineering and Manufacturing Technology Division (Mmt) Federation of British Engineers Tool Manufacturers Health and Safety Executive Institution of Production Engineers Ministry of Defence University of Aston in Birmingham Amendments issued since publication Amd. No. Date
6、of issue CommentsBS4656-35:1987 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 References 1 3 Definitions 2 4 Machine sizes 6 5 Preliminary remarks 6 6 Acceptance conditions and permissible deviations 7
7、 Publications referred to Inside back coverBS4656-35:1987 ii BSI 10-1999 National foreword This Part of BS4656 has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Committee and implements agreements of the International Organization for Standardization (ISO). It
8、is identical with ISO6155-2:1986 “Acceptance conditions for horizontal spindle capstan, turret and single spindle automatic lathes Testing of the accuracy Part2:Machinable bar diameters25mm or less and chuck diameter up to160mm”. Inch dimensions. In accordance with the UK policy of metrication, inch
9、 dimensions given in this standard are not valid and are included for information purposes only. Abbreviations. For the purposes of this standard, various methods of expressing permissible deviations are employed, each having a particular type of application. The methods employed are as follows. Dia
10、grams. For reasons of simplicity the diagrams in this standard illustrate only one type of machine. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are
11、not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “part of ISO6155” appear, referri
12、ng to this standard, they should be read as “Part of BS4656”. ISO 1101:1983, ISO3442:1975 and ISO 6155-1:1981 are referred to for information only. A related British Standard to ISO1101:1983 is BS308 “Engineering drawing practice”, Part 3:1972 “Geometrical tolerancing”. A related British Standard to
13、 ISO3442:1975 is BS1983 “Specification for chucks for machine tools and portable power tools”, Part2:1972 “Work-holding chucks”. A related British Standard to ISO6155-1:1981 is BS4656 “Specification for the accuracy of machine tools and methods of test”, Part31:1982 “Specification for capstan, turre
14、t and automatic lathes, single spindle type greater than25mm diameter capacity”. - - - / - - - This type of expression applies to deviations of perpendicularity that are ratios. - - - for any lengthof- - - This type of expression applies to deviations of straightness and parallelism, and is used in
15、fact for local permissible deviations, the measurement length being obligatory. - - - per - - - This type of expression applies to deviations of straightness and parallelism and is used to recommend a measurement length, but in this case the proportionality rule comes into operation if the measureme
16、nt length differs from that indicated. Cross-references International Standard Corresponding British Standard ISO 68:1973 BS 3643 ISO metric screw threads Part 1:1981 Principles and basic data (Technically equivalent) ISO 230-1:1986 BS 3800:1964 Methods for testing the accuracy of machine tools (Tec
17、hnically equivalent)BS4656-35:1987 BSI 10-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obl
18、igations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to 24, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on t
19、he inside front cover.iv blankBS4656-35:1987 BSI 10-1999 1 0 Introduction This part of ISO6155 applies only to lathes with a multi-tool turret of machinable bar diameter25mm or less and chuck diameter up to160mm. This turret can be manually indexed, semi-automatically indexed by motion of the turret
20、 slide, or automatically indexed by an independent control setting at the end of the operation. 1 Scope and field of application This part of ISO6155 describes, with reference to ISO230-1, both geometrical and practical tests on general purpose and normal accuracy capstan, turret and single spindle
21、automatic lathes. It deals only with the checking of accuracy of the machine. It does not apply to the testing of the running of the machine (vibrations, abnormal noises, stick-slip motion of components, etc.) or to machine characteristics (such as speeds, feeds, etc.) which should generally be chec
22、ked before the accuracy is tested. This part of ISO6155 does not cover machines with contouring numerical control, machines with sliding headstocks, machines with rotating tools, nor single spindle automatic lathes with fixed combined system headstock. 2 References ISO 68, ISO general purpose screw
23、threads Basic profile. ISO 230-1, Machine tools Acceptance code for machine tools Part 1: Geometric accuracy of the machine operating under no load or finishing conditions. ISO 1101, Technical drawings Geometrical tolerancing Tolerancing of form, orientation, location and run-out Generalities, defin
24、itions, symbols, indications on drawings. ISO 3442, Self-centring chucks for machine tools with two-piece jaws (tongue and groove type) Sizes for interchangeability and acceptance test specifications. ISO6155-1, Acceptance conditions for horizontal spindle capstan, turret and single spindle automati
25、c lathes Testing of the accuracy Part 1: Machinable bar diameters greater than25mm. BS4656-35:1987 2 BSI 10-1999 3 Definitions The machines referred to in this part of ISO6155 are defined as follows: 3.1 capstan lathe a lathe on the bed of which is fitted a slide base that may be manually moved long
26、itudinally along the bed and clamped in the desired position. On this slide base is mounted a short stroke slide which in turn carries an indexing turret which may be automatically operated by the return motion of the slide or manually indexedBS4656-35:1987 BSI 10-1999 3 3.2 turret lathe a lathe on
27、the bed of which is fitted a saddle capable of longitudinal motion, which in turn carries an indexing turret 3.3 combination turret lathe a turret lathe with the addition of a second saddle which carries a cross-slideBS4656-35:1987 4 BSI 10-1999 3.4 cross-feeding turret lathe a lathe on the bed of w
28、hich is fitted a saddle capable of longitudinal motion, which carries an indexing turret capable of transverse motionBS4656-35:1987 BSI 10-1999 5 3.5 single spindle automatic lathe a lathe having a frame supporting both the spindle headstock and the turret, and in some cases several independent slid
29、es the axes of the turret bores in the cutting position are always parallel to the spindle axis. The machine shall be capable of functioning under fully automatic cycling control. The method of control should be of any sequential type NOTEAll these types of lathes are manufactured with a variety of
30、turret configurations. The most common configurations are designated types A and C, and are described below: turret type A: Circular or multi-sided turrets whose axis of rotation cuts the work spindle axis. Whether or not the turret axis is perpendicular to the work spindle axis, the axis of each tu
31、rret bore shall align with the work spindle axis in its working position. Tools may be located in the bore, or located and clamped in the bore alone. turret type C: Circular (drum or disc type) turrets whose axis of rotation is parallel to the work spindle axis. Tools are located in the turret bores
32、, which are parallel to the turret axis, and the turret axis is arranged so that the work spindle axis aligns with the axes of the turret bores in their working positions.BS4656-35:1987 6 BSI 10-1999 4 Machine sizes The machines concerned shall correspond to the following criteria, partially or tota
33、lly: NOTEThe choice of the criteria is at the manufacturers discretion. 5 Preliminary remarks 5.1 In this part of ISO6155, all dimensions and permissible deviations are expressed in millimetres and in inches. 5.2 To apply this part of ISO6155, reference should be made to ISO230-1, especially for the
34、 installation of the machine before testing, warming up of spindles and other moving parts, description of measuring methods and recommended accuracy of testing equipment. 5.3 The sequence in which the geometrical tests are given is related to the sub-assemblies of the machine and this in no way def
35、ines the practical order of testing. In order to make the mounting of instruments or gauging easier, tests may be applied in any order. 5.4 When inspecting a machine, it is not always necessary or possible to carry out all the tests described in this part of ISO6155. It is up to the user to choose,
36、in agreement with the manufacturer, those relating to the properties which are of interest to him, but these tests are to be clearly stated when ordering a machine. 5.5 Practical tests shall be made with finishing cuts and not with roughing cuts which are liable to generate appreciable cutting force
37、s. The actual feeds and speeds will be selected by the manufacturer to suit the particular machine; they may be of the order of0,1mm (0.004 in) for depth of cut and0,1mm (0.004 in) per revolution for the feed. Test pieces made of a free-cutting metal should be used for the practical tests. 5.6 When
38、establishing the tolerance for a measuring range different from that given in this part of ISO6155 (see sub-clause2.311 in ISO230-1), it should be taken into consideration that the minimum value of tolerance is0,005mm(0.000 2 in). swing diameter over the bed u 250 mm (10 in) nominal bar diameter u 2
39、5 mm (1 in) nominal chuck diameter, as defined in ISO 3442 u 160 mm (6 in)BS4656-35:1987 BSI 10-1999 7 6 Acceptance conditions and permissible deviations 6.1 Preliminary operations No. Diagram Object G01 A Bed Verification of levelling of slideways: a) Longitudinal verification: straightness of slid
40、eways in the vertical plane. b) Transverse verification: slideways should be in the same plane. G02 Checking of parallelism of the turret slide slideways to the slide base slideways.BS4656-35:1987 8 BSI 10-1999 Permissible deviation Measuring instruments Observations and references to the ISO230-1 a
41、cceptance code mm in Precision levels, optical or other methods a) Sub-clauses 3.11, 3.21, 5.212.21 and 5.212.22 0,015 0.000 6 The measurements shall be carried out at a number of positions equally spaced along the length of the bed. for any measuring length Precision levels and support b) Sub-claus
42、e 5.412.7 b) Variation of level: Place a level transversely on the slideways and take measurements at a number of positions equally spaced along the length of the slideways. The variation of level measured at any position shall not exceed the permissible deviation. 0,03/1 000 0.001 2/40 0,01 0.000 4
43、 Sub-clause 5.422.5 for any measuring length of: The test applies only to machines having two sets of slideways integral with the bed. This test is made by means of a special support guided on the outside slideways, and supporting a dial gauge checking the parallelism of the inner slideways. 1 000 4
44、0 Dial gauge and support 0,01mm (0.004 in) over the whole bed length, if this is shorter than1000mm (40 in).BS4656-35:1987 BSI 10-1999 9 6.2 Geometrical tests No. Diagram Object G1 B Headstock spindle a) Measurement of periodic axial slip b) Measurement of camming of the spindle face. G2 Measurement
45、 of run-out of the centring diameter on the spindle nose. G3 This test only applies to machines with a locating bore for mounting work holding fixtures. Measurement of run-out of the spindle locating bore This test only applies to machines with internal taper spindle bore. G4 Measurement of run-out
46、of the work spindle internal taper a) at the spindle nose: b) at a distance of 100 mm (4 in) from the spindle nose.BS4656-35:1987 10 BSI 10-1999 Permissible deviation Measuring instruments Observations and references to the ISO230-1 acceptance code mm in a) Sub-clauses 5.622.1 and 5.622.2 a) 0,008 a
47、) 0.000 3 Dial gauge and possible special device The value of force F to be applied for the tests a) and b) shall be specified by the manufacturer. b) 0,012 b) 0.000 5 b) Sub-clause 5.632 including periodic axial slip Sub-clause 5.612.2 0,01 0.000 4 Dial gauge The value of force F to be applied shal
48、l be specified by the manufacturer. 0,008 0.000 3 Dial gauge Sub-clause 5.612.3 Dial gauge and test mandrel Sub-clause 5.612.3 a) 0,008 a) 0.000 3 b) 0,012 b) 0.000 5BS4656-35:1987 BSI 10-1999 11 No. Diagram Object G5 This test only applies to bar machines with work spindles for draw back collets. M
49、easurement of run-out of the collet housing in the spindle nose a) at the spindle nose; b) at a distance of 50 mm (2 in). Alternative Measurement by touching directly the front seating cone a) and the back register b).BS4656-35:1987 12 BSI 10-1999 Permissible deviation Measuring instruments Observations and references to the ISO230-1 acceptance code mm in a) and b) Sub-clause 5.612.3 a) 0,01 a) 0.000 4 Test mandrel and dial gauge b) 0,015 b) 0.000 6 a) and b) 0,008 0.000 3 Dial gaugeBS4656-35:1987 BSI 10-1999 13 No.
