Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To nformation Whereas the Parliament of ndia has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of ndian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to nformation, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New S 3264 (1985): Diamond or Cubic Boron Nitride Abrasive Grinding Wheels [PGD 9: Abrasives]! न $ एक न' भ रत क +नमण Satyanarayan Gangaram Pitroda nvent a New ndia Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 UDC S : ndian Standard SPECFCATON FOR * DAMOND OR CUBC BORON NTRDE ABRASVE GRNDNG WHEELS ( First Revision). Scope Covers the dimensional and other requirements of diamond of cubic boron nitride abrasive grinding wheels. Note For simplification, reference is made throughout this standard to diamond grinding wheels, but ail indications als0 apply to cubic boron nitride grinding wheels. 2. Key to Letter Dimensions for Diamond Grinding Wheel 6 f 0 1 _... 4) D.~_. +,$K_ F 4) R where D = outside diameter S = angle oftbody E = thickness at bore T = overall thickness H bore diameter Tl = reduced hub thickness 3 = hub diameter U = thickness of diamond section K = inside recess diameter V = face angle R = radius 3. Dimensions W = rim width = depth of diamond 3.1 Dimensions of diamond grinding wheels shall be as given in 3.2 to section The values of bore diameter H are not standardized and shall be as agreed between the manufacturer and the purchaser. Adopted 21 June 1985 Q April 1986, S Qr 7 NDAN STANDARDS NSTTUTON MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELH

5 AMENDMENT NO. 1 APRL 2009 TO S 3264 : 1985 SPECFCATON FOR DAMOND OR CUBC BORON NTRDE ABRASVE GRNDNG WHEELS ( First Revision ) (Page 8, clause 3.9.2) Substitute the following for existing figure: (Page 12, clause 4.1, Table) Substitute the following for the existing: Shape Total ndicator Reading (TR) mm Periphery Sides Rim Peripheral grinding wheels Straight cup and dish grinding wheels Taper cup grinding wheels (Page 12, clause 4.2) Substitute the value of Rim width W = ±0.5 mm or ±5 percent of rim width whichever is more for W = ±0.8 mm or ±5 percent of rim width whichever is more. Amend No. 1 to S 3264 : 1985 (Page 12, clause 4.2) Substitute the value of Depth of diamond section = +0.5 mm or +5 percent of the depth of diamond section whichever is more for = ±5 percent of the depth of diamond section. (Page 12, clause 5) Substitute the following for existing: Type of Bond The type of bond for grinding wheels shall be resin or metal or electroplated or vitrified. [Page 13, clause 11(e)] Substitute the following for existing: e) Type of bond (resin or metal or electroplated or vitrified), and (PG 09) Reprography Unit, BS, New Delhi, ndia

6 S : Plain Grinding WheelDesignation 1 Al All dimensions in millimetres x x x x x P 25 x x x x x 40 x x x x x _ 50 x x x x x _ 75 x _ 100 x 125 x ey pe 160 x A_ 1 5, 3, x x x x x PP 200 x x x x x p 260 x x x x x x x 300 x x x x x x PP_ 350 )( x x x x x 400 x x x x x x vc_ 450 x x x x x x P_P _ 600 x x PP _ 600 x x 750 c x x 2

7 S : Plain Grinding Wheel Reinforced Designation 14Al D J T 4!J _ ~ , O.12 1,2 _._.~ ls3.6 ~~ , 15,20 6, 10 ~ l_ , ,10, , O,15 3

8 S : Plain Grinding. Wheel Designation 1 Ll RO RO 4 D 3 4 T , 3, Plain Grinding Wheels Designation 1 E6Q Designationl 4E6Q D J T T, u V , , , a a 6 1, , 2 4

9 S : Plain Wheel Reinforced Designation 14EEl. D J T u V , , 4. 35". 45". 60". 90" _ V 35" 45" 60" 90" ' Designation 1 FFl D 60 R T. _ to10 2R 2,

10 S : Straight Cup Grinding Wheel Designation 6A2. _ 23 1 D 7 E W _ _ _ _.. 25 T _ 2, 3. 4, 6 6

11 3.8 Taper Cup Grinding Wheel Designation 1 A2 A S: D T J K E x , 6. w 10 1 ~._ , ,4 _ , and 45 Dished grinding wheel Designation 12A Dished Grinding 1 D T JK E w x x x :< ~ xxx v. _ x x x x

12 S: Dished grinding wheel Ail dimensions in millimetres. D J J K E W 3 _ _ _ _ ~.. 2, 3.4, _

13 3.10 Plain:Grinding Wheels With Two Recesses Designation 9A3 S: o D T2 E w T , Straight Cup Grinding Wheel Designation 6A9 + p 2 a r.d T K E lj , , , , , 10 9

14 S: Taper CUP Grinding Wheel Designation 11 V9 lp J J K E u O , ,lO Taper Cup Grinding Wheel Designation 12V9 + ~JA D T J K O ,lO x / P O 6.10 x x j 6,lO l:i_ 10

15 S : Plain Grinding Wheel Designation 1 Vg D T u V 160 O 2, 3 90, , , 3. 6 ~._ , / , / 3.15 Plain Grinding Wheel Designation 1 EE V T V ,

16 S : General Requirements 4.1 The true running of grinding wheels, when tested, shall fall within the limits specified below: Shape Total ndicator Reading (TR) mm.. F eripheral grinding wheels : straight cup and dish grinding wheels 1 aper cup grinding wheels Periphery Sides Rim The tolerances on various dimensions of diamond grinding wheels shall be as given below: Outside diameter D == _+ 1 5 mm Thickness T = f 0 4 mm Bore diameter H = H7 or any other tolerance as agreed between manufacturer and purchaser Rim width W f 0 8 mm or i 5 percent of rim width whichever is more Depth of diamond section = f 5 percent of the depth of diamond section 4.3 All grinding wheels shall be dynamically balanced. 4.4 All grinding wheels shall have chamfer at the bore. 5. Type of Bond The type of bond for the grinding wheels shall be resin or metal. 6. Grit Size The diamond grit size shall conform to S : ( Part 1 j1984 Grain sizes for diamond or cubic boron nitride: Part 1 Designation and grain size distribution. 6.1 Selection of Grit Size The selection of grit size is based on the surface finish requirements and rate of material removal, Following are the general recommended guidelines for selection of grit size of diamond abrasive. Surface Finish S Grit Designation Diamond CBN* Verycoarse Mediumcoarse D 181 D 151 B 181 B 151 Medium Mediumfine D 126 D 107 B 126 B 107 Fine Very fine Extra fine Super fine D 91 D 76 D 54 D 46 B 91 B 76 B 54 B 46 *Cubic boron nitride. 12

17 S: Designation Diamond grinding wheels shall be designated in accordance with S : General survey, designation and nomenclature of diamond or cubic boron nitride grinding wheels and saws. 8. Concentration As a basic value for diamond concentration in grinding wheels, 100 is equivalent to 4 4 carats per cubic centimetres. (0 88 g/cm ). This figure corresponds to 25 percent by volume, taking the density of diamond as 3 52 g/cm3. Standard concentration shall be 125, 100, 75 and 50. Other concentrations may be as agreed between the manufacturer and the purchaser. 9. Marking All diamond grinding wheels shall be marked legibly on the core, with the following information: a) Designation; b) Diamond concentration; c) Diamond grit size with a suffix as D for diamond and B for cubic boron nitride; d) Depth of diamond impregnation; e) Manufacturer s serial number; and f) Manufacturer s name or trademark. 9.1 S/ Certification Marking Details available? with the ndian Standards nstitution. 10. Packing The grinding wheels shall be suitably packed to avoid damage during handling and transportation. 11. Method of Ordering While purchasing diamond grinding wheels, the purchase order shall contain the following information: a) Type of grinding wheel, b) Designation, c) Diamond concentration, d) Diamond grit size, e) Type of bond (resin or metal), and f) Type of grinding (wet or dry). EPLANATORY NOTE The diamond or cubic boron nitride abrasive grinding wheels have diamond grains of different grit size designation bonded together with metallic, resinoid or similar bonds and held on metal or resin filled body. These wheels are used for finish grinding of tungsten carbide tipped tools, cutters, dies, and in ceramic industry for grinding ferrite. These are also used in the manufacture of optical lenses. This standard was first published in This revision has been taken up in order to align the standard with the work done at S0 level. Various other types of diamond grinding wheels which are commonly being used have also been included. Selection of grit size for the grinding wheels with reference to surface finish has been included for the guidance of the users. For selection of diamond or CBN grinding wheels; reference may be made to Recommendations for selection of diamond or CBN grinding tools ( under preparation ). n the preparation of this specification, considerable assistance has been derived from S Abrasive productsdiamond or Cubic Boron Nitride Grinding WheelsDimensions issued by the nternational Organization for Standardization (SO) Prmted at Printrade, New Delhi, ndia