View
5
Download
0
Category
Preview:
Citation preview
Disclosure to Promote the Right To Information
Whereas the Parliament of India 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 Indian 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.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 7778-1 (2003): Small Tools Sampling InspectionProcedures, Part 1: Twist Drills, Countersink andCounterbores [PGD 32: Cutting tools]
IS 7778 (Part 1) :2003
dl-23hTliHr~mmmhfam
Indian Standard
SMALL TOOLS SAMPLING INSPECTIONPROCEDURES
PART 1 TWIST DRILLS, COUNTERSINK AND COUNTERBORES
(First Revision )
ICS 25.100.30
0 BIS 2003
BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
. ——
January 2003 Price Group 3
Drills, Reamers and Threading Tools Sectional Committee, BP 10
...—
FORE WORD
This Indian Standard (Part 1) (First Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by Drills, Reamers and Threading Tools Sectional Committee had been approved by the Basic andProduction Engineering Division Council.
This standard was first published in 1975. In the light of experience gained over the years, in this revisionfollowing changes have been incorporated:
a) Definition of various terminologies used in the standard have been aligned with the practice followed
at 1S0 level,
b) Scale of sampling and criteria of conformity have been modified,
c) Classification of non-conformities for various type of cutting tools have been updated, and
d) To cater the specific need of the different industries and to make this standard.user friendly, thisstandard has been splitted in 11 Parts for easy adoption/acceptance and guide updation.
This standard has been prepared based on prevalent practice and experience available in the Indian Industries.While formulating this standard considerable assistance has been derived from IS 2500 (Part 1) :2000 ‘Samplinginspect ion procedures: Part 1 Attribute sampling plans indexed by acceptable quality level (AQL) for lot-by-lotinspection (third revision)’. IS 7778 ‘Small tools sampling inspection procedures’ is now being published in! I Parts. Other parts of the standard are given below:
Part 2Part 3Part 4Part 5Part 6Part 7Part 8Part 9Part 10
Part I 1
Reamers
Sleeves, sockets and adaptorsScrewing taps, dies and knurling toolsMilling cuttersMilling arbors and accessories
Gear cutting tools and broachesSawsSingle point (HSS and carbide tipped) tools
Carbide tips and indexable insertsHard metal burrs
IS 7778 (Part 1): 2003
Indian Standard
SMALL TOOLS SAMPLING INSPECTIONPROCEDURES
PART 1 TWIST DRILLS, COUNTERSINK AND COUNTERBORES
(First Revision )
1 SCOPE
This standard (Part 1) specifies sampling plans and
procedures for twist drills, countersink andcounterbores submitted for inspection in lots.
2 REFERENCES
The following standards contain provisions whichthrough reference in this text, constitute provisions ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:
IS No. Title
2500 (Part 1) : Sampling inspection procedures:2000 Part 1 Attribute sampling plans
indexed by acceptable quality level(AQL) for lot-by-lot inspection (third
revision)
4905:1968 Methods for random sampling
3 TERMINOLOGY AND DEFINITIONS
For the purpose of this standard the followingdefinitions shall apply. For terms not defined belowand for other clarifications, reference may be made toIS 2500 (Part 1).
3.1 Defect — A departure of a quality characteristicthat results in a product, process or service notsatisfying its intended normal usage requirements.
3.2 Non-Conformity — A departure of a qualitycharacteristic that results in a product, process orservice not meeting a specified requirement. Non-conformities will generally be established by theirdegree of seriousness, such as:
Class A — Those non-conformities of a typeconsidered to be of the highestconcern for the product or service.In acceptance sampling, such typesof non-conformity will be assignedvery small AQL values.
Class B — Those non-conformities of a type
considered to have the next lower
degree of concern. Therefore these
can be assigned a larger AQL valuethan those in Class A and smaller
than in Class C, if a third class exists.3.3 Non-Conforming Unit — A unit of product orservice containing at least one non-conformity. Non-conforming units will generally be classified by theirdegree of seriousness such as:
Class A — A unit which contains one or more,
non-conformities of Class A and mayalso contain non-conformities of
Class B and/or Class C.Class B — A unit which contains one or more
non-conformities of Class B and mayalso contain non-conformities ofClass C, but contains no non-conformity of Class A.
3.4 Percent Non-Conforming — The percent non-conforming of any given quantity of units of productsis 100 times the number of non-conforming units
divided by the total number of units of products, thatis:
Percent non-conforming
= Number of non-conforming units ~ ~O.
Total number of units
3.5 Acceptable Quality Level (AQL) — When a
continuous series of lots is considered, the quality level
which for the purpose of sampling inspection is a limit
of a satisfactory process average.
3.6 Sampling Plan — A specific plan which indicates
the number of units of products from each lot which
are to be inspected (sample size or series of sample
sizes) and the associated criteria for determining the
acceptability of the lot (acceptance and rejectionnumbers).
3.7 Lot — A collection of units of product from which
a sample shall be drawn and inspected to determine
conformance with the acceptability criteria, and which
may differ from a collection of units designated as a
lot for other purposes (for example, production,
shipment, etc).
.—
1
IS 7778 (Part 1) :2003
3.8 Sample — A sample consists of one or more unit%of product drawn from a lot, the units of the samplebeing selected at random without regard to theirquality. The number of units of product in the sampleIS the sample size.
4 SCALE OF SAMPLING
4.1 All small tools shall be selected at random from alot as per 1S 4905 to ensure randomness of selection.
4.2 Small tools shall be selected and examined foreach lot separately for ascertaining its conformity tothe requirements of the relevant specification.
The number of small tools to be selected from a lotshall depend on the sizes of the lot and type ofsampling plans and shall be in accordance withTables 1, 2 and 3.
5 DETERMINATION OF ACCEPTABILITY
5.1 To determine acceptability of a lot under percentnon-conforming inspection, the single sampling planshall be used in accordance with 5.1.1 for hardnesstest and performance test and the double sampling planshall be used in accordance with 5.1.2 for dimensionaland visual characteristics.
S. 1.1 Single Sampling Plan
The number of sample units inspected shall be equalto the sample size given by the plan. If the number ofnon-conforming units found in the sample is equal toor less than the acceptance number, the lots shall beconsideredconforming
acceptable. If the number of non-units is equal to or greater than the
rejection number, the lot shall be considered notacceptable.
5.1.2 Double Sampling Plan
The number of sample units first inspected shall beequal to the first sample size given by the plan. Ifthe number of non-conforming units found in thefirst sample is equal to or less than the first
acceptance number, the lot shall be considered
acceptable. If the number of non-conforming unitsfound in the first sample is equal to or greater thanthe first rejection number, the lot shall be considered
not acceptable.
If the number of non-conforming units found in thefirst sample is between the first acceptance andrejection numbers, a second sample of the size given
by the plan shall be inspected. The number of non-
conforming units found in the first and second samplesshall be accumulated. If the cumulative number of non-
conforming units is equal to or less than the second’acceptance number, the lot shall be consideredacceptable. If the cumulative number of non-conforming units is equal to or greater than the secondrejection number the lot shall be considered notacceptable.
6 CLASSIFICATION OF NON-CONFORMITY
Non-conformities of various inspection parameters for
HSS twist drills, carbide tipped twist drills andcountersink and counter bore covered under variousIndian Standards have been classified as Class A and
Class B and are tabulated in Tables 4, 5 and 6. .
Table I Scale of Sampling and Criteria for Conformity for Lot Quality for Visual and DimensionalCharacteristics (Double Sampling Plan for Normal Inspection — Inspection Level 111)
SI Lot SizeNo.
=
(1) (2)
i) up to 150
ii)
I
151t0280
iii)
I
281 tO 500
iv) I 501 to i 200
\,) I 201 to 3200
(Clause 4.2)
Y
(3) (4) (5)
First 20 20
Second 20 40First 32 32Second 32 64First 50 50Second 50 100First 80 80Second 80 160First 125 125Second 125 250
2
Non-Conformity
Class A Class BAQL 1.5 AQL 4.0
Ac Re Ac
(6) (7) (8)
o 2 1
1 2 4
0 3 23 4 61 4 34 5 82 5 56 7 123 7 78 9 18
Re
(9)
4
557799131119
.—
-. .-. ...
IS 7778 (Part 1) :2003
Table 2 Scale of Sampling and Criteria forConformity for Lot Quality for Hardness Test
(Single Sampling Plan for NormalInspections -– Inspection Level I)
(Ckmse 4.2)
sl Lot Size Sample Size AQL 1.5No.
Ac Re
(1) (2) (3) (4) (5)—.—i) UP to 280 8 0 1ii) 281 to 1200 32 I 2iii) I 201 to3200 50 2 3
---t
(1) (2)
i) 5100
ii) \ 5101I
=-l--=-—7iv) 5103
I
v) 5104
=--l-==
Tviii) 5362
ix) 5363
=1==
+-xi) 5365
T
Txv)
I
6710
Table 3 Scale of Sampling and Criteria forConformity for Lot Quality for Performance Test
(Single Sampling Plan for RedugedInspection — Inspection Level S-3)
(Clause 4.2)
SI Lot Size Sample AQL 4.0No. Size
Ac Re
(1) (2) (3) (4) (5)
i) up to 150 2 0 1ii) 151t03200 5 0 2
Table 4 Classification of Non-Conformity in Twist Drills
(Clause 6)
Type of Tool Class A Non-Conformity Class B Non-Conformity
(3) (4) (5)
Twist drills, parallel shank, stub Hardness, Drill diameter, Point angle, Flute length, Overall length and
series Backtaper and Run out Helixangle
Twist drills, parallel shank, jobber Hardness, Drill diameter, Performance Flute length, Overall length andseries point angle, Back taper and Run out Helix angle
Twist drills, parallel shank, long Hardness, Drill diameter, Performance Flute length, Overall length andseries point angle, Back taper and Run out Helix angle
Twist drills, morse taper shanks Hardness, Drill diameter, Performance Flute length, Overall length andmorse taper shank, Point angle, Back Helix angletaper and Run out
Twist drills, over size morse tapershank
Twist drills, taper square shanks forratchet braces
Twist drills, taper square shanks forcarpenters braces
Twist drills, parallel shank, stubseries, left hand cutting forautomatics
Micro drills
Hardness, Drill diameter, Morse taper Flute length, Overall length andshank, Point angle, Back taper and Run Helix angleout
Hardness, Drill diameter, Square shank, Flute length, Overall length andPoint angle, Back taper and Run out Helix angle
Hardness, Drill diameter, Square shank, Flute length, Overall length andPoint angle, Back taper and Run out Helix angle
Hardness, Drill diameter, Point angle, Flute length, Overall length andBack taper and Run out Helix angle
Hardness, Drill diameter, Shank Flute length, Overall length anddiameter, Point angle, Back taper and Helix angle
Run out
Twist drills for taper pin holes with Hardness, Drill diameter, Shank Flute length, Overall length andtaper I: 50 diameter, Morse taper shank, Taper Helix angle
angle, Point angle and Run out
Core drills, parallel shank Hardness, Core drill diameter, Run out Flute length, Overall length andand Back taper Helix angle
Core drills, morae taper shank Hardness, Core drill diameter, Morse Flute length, Overall length andtaper shank, Back taper and Run out Helix angle
Centre drills-Type A Hardness, Pilot diameter, Shank Pilot length, Overa[l length anddiameter and Point angle 60° angle
Centre drills-Type B Hardness, Pilot diameter, Shank Pilot length, Overall length, 60°diameter and Point angle and 120° angle and dl diameter
Centre drills-Type R Hardness, Pilot diameter, Shank 1 length, Overall length anddiameter and Point angle Radius
Twist drills for jig boring machines Hardness, Drill diameter, Morse taper Flute length, Overall length andshank and Radial runout Helix angle
3
.—
1S 7778 (Part 1) :2003—
Table 4 (Concluded) —
slNo.
IS No. Type of Tool Class A Non-Conformity
(4)
Class B Non-Conformity
(5)
Length, dz diameter, Drivingslot, Width, Depth and Helixande
(1)
xvii)
(2) (3)
7772 Shell core drills Hardness, Drill diameter, Bore diameterand Runout
Hardness, Drill diameter, Morse tapershank, Runout and Point angle
Hardness, Drill diameter, Shankdiameter. Runout and Point anrzle
Twist drills, morse taper shank, extralong series
Twist drills, parallel shank, extra longseries
Twist drills, morse taper shank, longseries
Sub land twist drills with morse tapershanks for holes prior to tapping screwthreads
Flute length, Overall lengthand Helix arwle
xviii) 7822
7823
8305
12687
Flute length, Overall lengthand Helix ande
xix)
Flute length, Overall lengthand Helix angle
xx)
xxi)
Hardness, Drill diameter, Morse taperkhank, Runout and Point angle
Hardness, Drill diameter, Stepdiameter, Morse taper shank, Runout,Point angle and Countersink angle
Hardness, Drill diameter, Stepdiameter, Morse taper shank, Runout,Point angle and Countersink angle
Flute length, Overall length,Step length and Helix angle
Flute length, Overall length,Step length and Helix angle
xxii)
xxiii)
12688
12689
Sub land twist drills with morse tapershanks for clearance holes andcountersinks for countersunk headscrews
Sub land twist drills with parallelshank for clearance holes andcounterbores for slotted cheese headscrews
Hardness, Drill diameter, Stepdiameter, Shank diameter, Runout andPoint angle
Hardness, Drill diameter, Stepdiameter, Morse taper shank, Runoutand Point angle
Flute length, Overall length;Step length and Helix angle
Flute length, Overall length,Step length and Helix angle
xxiv)
xxv)
12690
1269 I
Sub land twist drills with morse tapershanks for clearance holes andcounterbores for slotted cheese headscrews
Sub land twist drills with parallelshank for holes prior to tapping screwthreads
Hardness, Drill diameter, Stepdiameter, Shank diameter, Runout pointangle and Countersink angle
Hardness, drill diameter, Step diameter,Shank diameter, Runout point angleand Countersink angle
Flute length, Overall length,Step length and Helix angle
Flute length, Overall length,Step length and Helix angle
12692 Sub land twist drills with parallel shankfor clearance holes and countersinks forcountersunk head screws
XXVI)
Table 5 Classification of Non-Conformity in Carbide Tipped Drills
(Clause 6)
S1 No. IS No. Type of Tool Class A Non-Conformity Class B Non-Conformity
(1) (2) (3) (4) (5)
i)I
8306
I
Carbide tipped twist drills morse taper Hardness on shank, Drill diameter Flute length, Overallshanks and Morse taper shank length and Point angle
ii)
i
8307
I
Carbide tipped twist drills parallel Hardness on shank, Drill diameter Flute length, Overallshanks and Shank diameter length and Point angle
iii) 9771 Carbide tipped core drills with morse Hardness on body and tang, Drill Flute length and Overalltaper shanks diameter and Morse taper shank length
4
IS 7778 (Part
Table 6 Classification of Non-Conformity in Countersinks and Counterbores
(Clause 6)
sl IS No.
N(I.
(1) (2)
1) 5693
-1----il) 5703
Iv)
I
5705
7!,) 5710
II
\i) I 3303
-1---vii) 13304
Type of Tool
(3)
Countersinks 90° parallel shank and solidpilots
Countersinks with morse taper shank
Counterbore with parallel shank and solidpilots
Pilots for countersinks and counterbores
Counterbore with morse taper shank
Countersinks 60°, 90° and 120° withmorse taper shank
Countersinks 60°, 90° and 120° withparallel shank
5
Class A Non-Conformity
(4)
Hardness, Cutter diameter,Pilot diameter, Shank diameterand Countersink angle
Hardness, Countersinkdiameter, Morse taper shankand Countersink angle
Hardness, Counterborediameter, Pilot diameter andShank diameter
Hardness, Shank diameter andHead diameter
Hardness, Counterborediameter and Morse tapershank
Hardness and Morse tapershank
Hardness and Shank diameter
Class B Non-Conformity
(5)
Cutting edge length, Shanklength and Overall length
Cutting edge length, Overalllength, dz and d~ diameters andf, and fl lengths
Cutting edge length, Overalllength and Shank length
Head length and Overall length
Cutting edge length, Overalllength, dz and d, diameters and/3 and f,i Iengtbs
Nominal diameter, Smalldiameter, Body length, Overalllengthand Countersinkangle
Nominal diameter, Smalldiameter, Body length, Overalllength and Countersink angle
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in any form
without the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications.), BIS.
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffkmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc : No. BP 10 (0324).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
BUREAU OF INDIAN STANDARDS
Headquarters :
Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams : Manaksanstha
Telephones :3230131, 3233375,3239402 (Common to all offices)
Regional Offices : Telephone
Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg
{
32376 i 7
NEW DELHI 110002 3233841
Eastern : 1/14 C.I.T. Scheme VII M, V. 1. P. Road, Kankurgachi
{
3378499,3378561
KOLKATA 700054 3378626,3379120
Northern : ‘------- .- ---- . . . .. —-- .—.-. --.-- -.-– —.–
Southern :
Western :
XX) 33>-336, Sector 34-A, UHANDIGARH 16(J 022
i
603843
602025
C.I.T. Campus, IV Cross Road, CHENNAI 600113
{
2541216,25414422542519,2541315
Manakalaya, E9 MIDC, Marol, Andheri (East)
{
8329295,8327858
MUMBAI 400093 8327891,8327892
L––
Branches : AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD.GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR.NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISAKHAPATNAM.
PrintedatPrabhatOffsetRess, NewDethi-2
Recommended