1、BRITISH STANDARD BS3884-2: 1990 ISO8526-1: 1990 Modular units for machine tools Part2: Specification for workholding pallets up to800mm nominal sizeBS3884-2:1990 This British Standard, having been prepared under the directionof the Machine, Engineers and Hand Tools Standards Policy Committee, waspub
2、lished under the authorityof the Board of BSI andcomes into effect on 30November1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference MTE/1 Draft for comment 86/70426 DC ISBN 0 580 19169 9 Committees responsible for this BritishStandard The preparatio
3、n of this BritishStandard was entrusted by the Machine, Engineers and Hand Tools Standards Policy 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 Trad
4、e and IndustryMechanical Engineering and Manufacturing Technology Division(Mmt) Health and Safety Executive Ministry of Defence Coopted members Amendments issued since publication Amd. No. Date CommentsBS3884-2:1990 BSI 12-1999 i Contents Page Committees responsible Inside front cover National forew
5、ord ii 1 Scope 1 2 Normative references 1 3 Terminology 1 4 Dimensions 1 5 Top surface 1 6 Location of workpiece 2 7 Bottom surface 2 8 Designation of pallets 2 Annex A (normative) Top surfaces with radial T-slots Types5 and6 10 Annex B (informative) Principle of arithmetic and geometric progression
6、sapplied to T-slot pitches 12 Figure 1 Workholding pallet 1 Figure 2 Types of top surface 3 Figure 3 Principal dimensions of workholding pallets 5 Figure 4 Details of edge locators 8 Figure 5 Fixing holes for latch mechanism 9 Figure A.1 Top surface, type5 with radial T-slots 10 Figure A.2 Top surfa
7、ce, type6 with twin radial T-slots 11 Figure B.1 Pallets with an arithmetic progression of the T-slot pitches 12 Figure B.2 Pallets with a geometric progression of the T-slot pitches 13 Table 1 Terminology 1 Table 2 Dimensions of workholding pallets 6 Table 3 Dimensions of edge locators 8 Table 4 Di
8、mensions of fixing holes for latch mechanism 9 Table A.1 Dimensions for type5 10 Table A.2 Dimensions for type6 11 Publication(s) referred to Inside back coverBS3884-2:1990 ii BSI 12-1999 National foreword This Part of BS3884 has been prepared under the direction of the Machine, Engineers and Hand T
9、ools Standards Policy Committee and implements agreements of the International Organization for Standardization(ISO). It is identical with ISO8526:1990 “Modular units for machine tools Workholding pallets Part1: Workholding pallets up to800mm nominal size”. The Technical Committee has reviewed the p
10、rovisions of ISO299:1987 and ISO1101:1983, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO299 is BS2485:1987 “Specification for tee slots, tee bolts, tee nuts and tenons”. A related BritishS
11、tandard to ISO1101 is BS308 “Engineering drawing practice” Part3:1972 “Geometrical tolerancing”. The introduction to ISO8526-1 reads as follows. “This part of ISO8526 has been drawn up to facilitate interchangeability of workholding pallets, including those from different manufacturers. It deals wit
12、h square pallets and rectangular pallets of length-to-width ratio of1,25 and of nominal size up to800mm. If pallets with tighter tolerances than specified in this part of ISO8526 are required, they shall be subject to agreement between the manufacturer and user. This part of ISO8526 does not specify
13、 the positioning accuracy of the pallets.” 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 obligations
14、. Cross-references International Standard Corresponding BritishStandard BS4500 ISO limits and fits ISO286-2:1988 Section1.2:1990 Tables of commonly used tolerance grades and limit deviations for holes and shafts (Identical) ISO2768:1989 Part3:1973 Working limits on untoleranced dimensions (Technical
15、ly equivalent) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to14, 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
16、on the inside front cover.BS3884-2:1990 BSI 12-1999 1 1 Scope This part of ISO8526 specifies the dimensions of workholding pallets for use with machine tools and in manufacturing systems. It applies to the following nominal sizes of pallet: 320mm,400mm,500mm,630mm and800mm 2 Normative references The
17、 following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO8526. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO8526 are encouraged t
18、o investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO286-2:1988, ISO system of limits and fits Part2: Tables of standard tolerance grades and limit deviations for
19、holes and shafts. ISO299:1987, Machine tool tables T-slots and corresponding bolts. ISO1101:1983, Technical drawings Geometrical tolerancing Tolerancing of form, orientation, location and run-out Generalities, definitions, symbols, indications on drawings. ISO2768-1:1989, General tolerances Part1:To
20、lerances for linear and angular dimensions without individual tolerance indications. 3 Terminology 3.1 Nominal size The nominal size is given by dimensiona 1(seeFigure 3). 3.2 General The terms used for the purposes of this part of ISO8526 are listed in Table 1 and illustrated in Figure 1. Table 1 T
21、erminology 4 Dimensions Dimensions of pallets are given in Table 2. 5 Top surface 5.1 Corners Corners shall be removed from pallets (seedimension c in Table 2). 5.2 T-slots and threaded holes Either T-slots or threaded holes may be provided in the top surface. Pitches of threaded holes and T-slots a
22、nd T-slot dimensions shall comply with ISO299. Dimensions and pitches of T-slots and threaded holes are given in Table 2. NOTE 1The top surface may be left plain, if desired, for special applications. NOTE 2Radial slots may be used for special applications. Their dimensions are given in Annex A, Tab
23、le A.1 and Table A.2. 5.3 Types of top surface The different types of top surface are as follows: type1: surface with threaded holes seeFigure 2a); type2: surface with T-slotsseeFigure 2b); type3: surface with T-slots and cross-tenonsseeFigure 2c); type4: plain surface(seeFigure 5); type5: surface w
24、ith radial T-slots (seeFigure A.1); type6: surface with twin radial T-slots(seeFigure A.2). Reference number Designation 1 2 3 4 5 6 7 8 9 10 Top surface of pallet Centre hole Location surface Clamping surface Transportation slide surface Location hole Edge locator(when fitted) Alignment hole(when p
25、rovided) Fixing holes for latch mechanism Resting surface Figure 1 Workholding palletBS3884-2:1990 2 BSI 12-1999 5.4 Centre hole A centre hole shall be provided and may be used as a reference hole for work positioning on the pallet and/or as a reference hole for pallet manufacturing(seeFigure 1). Th
26、e depth of the counterbore, d 4 , if present, shall always be greater than the depth of the central tenon slot of the pallet. 5.5 Alignment hole An alignment hole, d 6 , may be provided for use in positioning the workpiece or fixture on the pallet and/or as a reference hole for pallet manufacturing
27、purposes(seeFigure 1). NOTEIt is necessary to provide means of preventing ingress of swarf and coolant to the bottom surface. 6 Location of workpiece Workpieces or fixtures shall be located on the top surface by one of the following methods: a) by means of edge locators(seeFigure 4 and Table 3); NOT
28、EFor type2 and type3 top surfaces, the mounting holes for the edge locators are at the discretion of the manufacturer. The positions of the fixing holes for the fixture should be the same as those shown in Figure 4. b) by means of a centre hole and an associated alignment hole(where the top surface
29、of the pallet has threaded holes)seeFigure 2a); c) by means of a centre hole and a reference slot(where the top surface of the pallet has T-slots)seeFigure 2b); d) by means of two perpendicular tenon (crossed-tenon) slotsseeFigure 2c); e) by means of two straight-through location holes, d 3or d 10 (
30、seeFigure 3, sections X-X and Z-Z). NOTE 1It is necessary to provide means of preventing ingress of swarf and coolant to the bottom surface. NOTE 2The straight-through feature is optional. 7 Bottom surface 7.1 Location of pallet on the receiver (onthemachine tool) Location of the pallet on the recei
31、ver shall be by means of one of the following methods (seeFigure 3): a) by two cylindrical holes on the pallet(seeFigure 3, section X-X) and two cylindrical pins on the receiver; b) by two tapered holes on the pallet (seeFigure 3, section Z-Z) and two tapered pins on the receiver. 7.2 Shape and dime
32、nsions The shape and dimensions of the bottom surface are given in Figure 3 and Table 2. 8 Designation of pallets The designation of a pallet is given by the number of this part of ISO8526; its nominal size and length, a 1 a 1or a 1 a 2 ; its top surface type(see5.3); the pitch of its T-slots or thr
33、eaded holes; the method of workpiece location seeclause6,a) to e); the method of locating the pallet on the receiversee7.1, a) and b). EXAMPLE Designation of a square pallet, of nominal size and length500 500, with top surface type2, with100mm pitch of T-slots, with workpiece location by means of ce
34、ntre hole and reference slotc), and pallet location on the receiver by means of cylindrical holes a): ISO8526-1500 500-2-100-c-a EXAMPLE Designation of a rectangular pallet, of nominal size and length500 630, with top surface type2, with100mm pitch of T-slots, with workpiece location by means of cen
35、tre hole and reference slotc), and pallet location on the receiver by means of tapered holes b): ISO8526-1500 630-2-100-c-bBS3884-2:1990 BSI 12-1999 3a)topsurface, type1with threaded fixing holesb)topsurface, type2with T-slots Figure 2 Types of top surface (continued)BS3884-2:1990 4 BSI 12-1999c)top
36、surface, type3with T-slotsand cross-tenons NOTEFor the tolerancing of location and orientation, seeISO1101. Figure 2 Types of top surface (concluded)BS3884-2:1990 BSI 12-1999 5 NOTE 1The positions of the two tapered holes are the same as those specified for the two cylindrical location holes. The ty
37、pe of location required should be stated when ordering pallets. NOTE 2For the tolerancing of form, orientation and location, seeISO1101. NOTE 3Bushes of minimum depth equal to11/4 times their diameter may be inserted at either end of d 3 , if preferred. NOTE 4Where d 3or d 10is straight through, the
38、 centre portion of the bore of d 3or d 10may be relieved to a maximum length of h 2 2,5 d 3or h 2 2,5 d 10respectively, if desired. Figure 3 Principal dimensions of workholding palletsBS3884-2:1990 6 BSI 12-1999 Table 2 Dimensions of workholding pallets a (seeFigure 2 andFigure 3) Dimensions in mill
39、imetres Nominal size and length Dimension a 1 a 1 320 320 a 1 a 2 320 400 a 1 a 1 400 400 a 1 a 2 400 500 a 1 a 1 500 500 a 1 a 2 500 630 a 1 a 1 630 630 a 1 a 2 630 800 a 1 a 1 800 800 a 1 a 2 800 1000 290 340 430 540 670 272 300 380 480 600 b 3 160 160 220 300 380 c b 40 50 60 70 100 400 500 630 8
40、00 1000 466,5 583 736 938 1166 25 25 25 30 35 d 4 (optional) 55 55 55 55 55 d 5 H6 c, d 50 50 50 50 50 d 6H7 c, e 20 20 20 25 25 d 7 f M10 M12 M12 M16 M16 d 8 f 11 13,5 13,5 17,5 17,5 d 9 29 29 29 40 40 d 10 g 25 25 25 30 35 e 1 120 125 160 200 250 e 2 0,01 240 250 320 400 500 h 1 0,5 95 115 125 150
41、 170 h 2 0,02 90 105 115 140 160 20 25 25 30 30 45 50 60 75 95 65 70 80 95 115 h 6 44 49 59 74 94 h 7min. 20 25 25 30 30 l 1 0,013 h, i AP 100 150 200 200 300 GP 126 160 200 250 320 l 2 h, i AP 50 50 100 100 100 GP 63 80 100 125 160 l 3 h, i AP 50 50 100 100 100 GP 63 80 100 125 160 b 10 0,5 b 2+0,5
42、 0 200 +1 0 200 +1 0 260 +1,6 0 340 +1,6 0 420 +1,6 0 b 4+0,5 0 d 10 5 d 20 5 d 3+0,013 0 h 30 0,25 h 40 0,25 h 50 0,25BS3884-2:1990 BSI 12-1999 7Table 2 Dimensions of workholding pallets a (seeFigure 2 andFigure 3) Dimensions in millimetres Nominal size and length Dimension a 1 a 1 320 320 a 1 a 2
43、320 400 a 1 a 1 400 400 a 1 a 2 400 500 a 1 a 1 500 500 a 1 a 2 500 630 a 1 a 1 630 630 a 1 a 2 630 800 a 1 a 1 800 800 a 1 a 2 800 1000 m j 12 14 14 18 18 20 23 23 30 30 20 22 22 30 30 t 2 8 10 10 12 12 t 3 0,54 2,54 2,54 2,67 2,67 a For working limits on untoleranced dimensions, seethe medium seri
44、es of ISO2768-1. b Chamfer 45 or radius at choice of the manufacturer. c SeeISO286-2. d The centre hole may have a bush in the reference bore. e Depth at manufacturers discretion. f The recess dimensions,d 8 0,5, associated with the tapped holes in the top surface are primarily for thread protection
45、. Headed plugs may be inserted in exposed holes to prevent the ingress of swarf, in which case the recess dimensions may be modified to accommodate the heads of the plugs. The use of plain plugs does not necessitate a change in these dimensions. The dimensions of plugs have not been standardized. Th
46、erefore such dimensions are left to agreement between purchaser and manufacturer. g If d 10is used as a location holeseeclause6 e), it shall have a tolerance of h For rectangular pallets, the pitch of the outer threaded holes(on the longer dimension of the pallet) shall be half of the nominal pitch
47、in order to avoid the threaded hole being too near the edge of the pallet. i AP and GP dimensions are alternative values, where AP is the arithmetic progression and GP is the geometric progression. (SeeAnnex B.) j The tolerance on m is H8 for tenon slots and H12 for fixing slots. n +1 0 t 1+1 0 + 0,
48、013 0 .BS3884-2:1990 8 BSI 12-1999 Table 3 Dimensions of edge locators(when fitted) Figure 4 Details of edge locators(when fitted) Dimensions in millimetres Nominal size of pallet a 1 L 1 L 2 L 3 L 4 L 5 L 6 0,01 L 7 L 8 L 9 0,01 H 1 H 2 D 1 D 2 Fixing screw in pallet 320 160 50 25 50 63 160 15 10,5
49、 200 80 22 11 17,5 M10 400 200 55 40 80 80 200 20 13 250 80 22 14 20 M12 500 250 75 40 80 125 250 25 13 315 80 22 14 20 M12 630 315 100 40 80 160 315 30 17 400 90 27 18 26 M16 800 400 135 40 80 200 400 30 17 500 90 27 18 26 M16BS3884-2:1990 BSI 12-1999 9 Table 4 Dimensions of fixing holes for latch mechanism Figure 5 Fixing holes
