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IS 12635 (2000) : Water Well Drilling and Blast Hole 
Drilling - Rock Roller Bit with Non-sealed Ball and Roller 
Bearing Arrangement - Technical Supply Conditions [MED 21: 
Diamond Core and Waterwell Drilling] 




Jawaharlal Nehru 
'Step Out From the Old to the New" 



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IS 12635:2000 

[ Reaffirmed 2006 ) 

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Indian Standard 

WATER WELL DRILLING AND BLAST HOLE 

DRILLING — ROCK ROLLER BIT WITH NON-SEALED 

BALL AND ROLLER BEARING ARRANGEMENT — 

TECHNICAL SUPPLY CONDITIONS 

( First Revision ) 

ICS 25.080.40 



© BIS 2000 

BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG 
NEW DELHI 110002 

July 2000 Price Group 4 



Diamond Core and Water Well Drilling Sectional Committee, ME 21 



FOREWORD 

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized 
by the Diamond Core and Water Well Drilling Sectional Committee had been approved by the Mechanical 
Engineering Division Council. 

Rock roller bit is a complex cutting tool used for the following applications: 

Deep oil well drilling 

Water well drilling 

Blast hole drilling for mining 

Short hole drilling for seismic surveys 

This standard was first published in 1989. It was observed that this standard is specifically suitable for oil well 
drilling since it was based on API standard. The bits required modifications in the sizes of rock roller bits, pin 
connection, nozzle that these bits could be used for water well drilling and blast hole drilling bits. 

In this revision, modifications have been incorporated, specially in sizes and pin connections {see Tables 1 and 
2) to cover sizes and connections required for drilling for water well and mining. 

Functional and constructional details, both for steel milled tooth arid tungsten carbide insert bits have been 
incorporated in detail. 

The technical details provided in the revised draft makes it acomplete standard for water well drilling and blast 
hole drilling rock roller bits with non-sealed ball and roller bearing arrangements. 

This standard will supersede IS 12194 : 1987 ^Dimensions for rock roller bits and blade drag bits for rock 
drilling equipment' as the information contained in IS 12194 is covered in this revised draft. 

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, 
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with 
IS 2 : 1 960 *Rules for rounding off numerical values {revised)' . The number of significant places retained in the 
rounded off value should be the same as that of the specified value in this standard. 



IS 12635 : 2000 



Indian Standard 



WATER WELL DRILLING AND BLAST HOLE 

DRILLING — ROCK ROLLER BIT WITH NON-SEALED 

BALL AND ROLLER BEARING ARRANGEMENT — 

TECHNICAL SUPPLY CONDITIONS 

( First Revision ) 



1 SCOPE 

This standard covers the technical supply conditions 
of tricone rock roller bits having milled steel teeth 
design (see Fig. 1) and tungsten carbide insert design 
(see Fig. 2) with non-sealed ball and roller bearing 

REGULAR THREAD 
CONNECTION 



MANUFACTURERS 
SERIAL NUMBER 




arrangement for water well drilling and blast hole 
drilling application. The technical supply conditions 
stipulated under this standard are general in nature 
and shall be backed by design specifications of the 
individual manufacturers depending on the 
applicability of the product. 



BIT SIZE 



manufa cturer's 

Of Aki wif-»ii ^r- ^. DESIGNATION 

PLAN VIEW OF TOP OF THREAD FACE 
SHOWING MARKING DETAILS 



TOP OF THREAD FACE 



REGULA R THREAD 



NOZZLE 




BALL 

RETAINING PLUG 



SHIRT TAIL 



ROLLER 
BEARING 



BALL BEARING 



THRUST BUTTON 



MILLED STEEL 
TOOTH ON 
OUTER SURFACE 
OF CONE 



Fig. 1 A Typical Steel Tooth Rock Roller Bit 
i 



IS 12635 : 2000 



REGUiAR THREAD 
CONNECTION 



manufacturer's 
serial number 




BIT SIZE 



MANUF ACTURER'S 
DESIGNATION 



PLAN VIEW OF TOP OF THREAD FACE 
SHOWING MARKING DETAILS 



TOP OF THREAD FACE 




REGULAR THREAD 



NOZZLE 



CARBIDE 



BALL 
RETAINING 



SHIRT TAIL 

ROLLER 
BEARING 



BALL BEARING 



NOSE BUSH 



THRUST BUTTON 



BUTTONS FITTED 
ON OUTER 
SURFACE OF CONE 



Fig. 2 A Typical Tungsten Carbide Insert Rock Roller Bit 



2 REFERENCE 

The following standard contains provision which 
through reference in this text, constitute provision of 
this standard. At the time of publication, the edition 
indicated was valid. All standards are subject to 
revision and parties to agreements based on this 
standard are encouraged to investigate the possibility 
of applying the most recent edition of the standard 
indicated below: 



ISNa Title 

9439: 1 980 Glossary of terms used in water well 

drilling technology 

3 TERMINOLOGY 

3.1 For the purpose of this standard the terminology 
given in IS 9439 shall apply. In addition the 
terminology given in 3.2 to 3.11 shall also apply. 



IS 12635 : 2000 



3.2 Rock Roller Bits 


Rock roller bits basically 


main components: 


a) 


Leg, 


b) 


Cones, 


c) 


Ball elements, 


d) 


Roller elements, 


e) 


Sleeve, 



consists of the following 




f) Thrust Bearing, 

g) Ball plug, and 
j) Nozzles. 

3.2.1 The basic component of rock roller bit on which 
bearing races are machined at one end and the 
connecting threads are machined on the other end. 
The cones shall be mounted at the end where the 
bearing races are machined {see Fig. 3). 

3.2.2 Each rock roller bit assembly shall consist of 
three cones which form the rolling element of the bit. 
These cones shall be marked as cone I, 2 and 3 
depending on their status in the rock bit assembly. 

3.3 Heat Treatment 

Heat treatment method shall be so designed that the 
bearing races shall have sufficient hardness to act as 
an effective bearing system and have wear and 
abrasion resistance. The bottom end of the leg shall 
remain soft and tough to enable connecting thread 
machining after assembly. 

3.4 Cone 

The cones shall be machined from forgings made of 
alloy steel having the following properties: 

a) High fatigue and impact strength, 

b) Good wear and abrasion resistance, and 

c) Should be of low carbon alloy steel to enable 
deep carburizing. 

3.4.1 Steel Milled Tooth Cones 

The cones made of a steel body from a steel froging 
where cutting structures are formed on the outer surface 
and the inner surface consists of the bearing elements 
{see Fig. 4), 

3.4.2 Tungsten Carbide Insert Cones 

These cones made of steel forgings with the inner 
surface consisting of bearing races and outer surface 
having holes, drilled and reamed, and fitted with 




Fig. 3 Detae^s of Leg 



Fig. 4 Steel Milled Tooth Cone 



IS 12635 : 2000 

carbide buttons so as to form cutting structures 
{seeFig,5). 

3.5 Leg 

The leg shall be machined from forgings made of alloy 
steels having following properties: 



a) Good spalling and abrasion resistance on 
hearing races, 

b) High impact strength, 

c) Steel shall be readily weldable, and 

d) Should be of low carbon alloy steel which can 
easily be carburizing. 




Fig. 5 Tungsten Carbide Insert Cone 



3.6 Bearings 

Balls and rollers used as bearings shall be produced 
from shock resistant tough hardening bearing steel 
and shall exhibit very high spalling wear and fatigue 
and impact strength. 

3.7 Sleeve 

The sleeve is basically a bush bearing and shall be 
made of heat resistant steel which shall have the 
following properties: 

a) Very high abrasion resistance, 

b) retenion of hardness at high frictional 
temperature, and 

c) good core toughness. 

3.7,1 Sleeves shall be provided on the cones to act as 
bearing media where additional bearings cannot be 
provided such as bush bearing. 

3.8 Thread Connection 

The thread shall be generated in the shank and shall 
be the final machining operation of the bit. The thread 
connection for each size of bit shall be as specified in 
Table 2. 



3.9 Pin Connection 

The rock roller bits shall be supplied with the style 
and sizes of pin connection given in Table 2. 

3.10 Thrust Button 

The thrust button shall be made of high speed steel 
and shall exhibit the following: 

a) very high abrasion resistance, 

b) retention of hardness at high frictional 
temperature, and 

c) good core toughness. 
3.10,1 Thrust Bush 

Thrust bush shall be provided as part of the bearing 
structure in the cone. The bush shall be made of high 
speed steel and shall absorb the thrust load through 
the leg pin while the bit is in use {see Fig. 8). 

3.11 Nozzles 

The nozzles shall be made of either steel or carbide or 
a combination of both. The nozzles shall exhibit good 
resistane to erosion and abrasive wear. Steel nozzles 
shall be used unless otherwise specified for water well 
and blast-hole applications. The internal profile shall 
be designed and machined to enable smooth outlet of 
flushing medium such as water or air. 



IS 12635 : 2000 



4 FUNCTIONALAND CONSTRUCTIONAL 
DETAILS 

The tricone rock roller bits are of intricate design and 
serve as a basic tool for drilling holes by rotary drilling 
method. The constructional details of the rock roller 
bits shall be able to drill a wide spectrum of formations 
from very soft formations to very hard and abrasive 
formations. The cutting teeth on the cones shall be so 
designed and spaced that they shall be either chip or 
crack the geological formations encountered while 
the bit is in rotary motion. The flushing system shall 
be fool-proof enough in evacuating the crushings 
formed at the hole bottom. The flushing medium in 
case of water well drilling shall be bentonite mud and 
for blast hole drilling shall be compressed air. 

5 SIZES OF ROCK ROLLER BITS 

5.1 Rock roller bits shall be supplied in the sizes 
given in Table I. 



Table 1 Sizes of Rock Roller Bits 





(Clause 5A) 






All dimensions 


in millimetres. 




73.025 


158.75 


250.825 


406.40 


74.612 


171.45 


269.875 


444,50 


98.425 


193.675 


298.45 


457.20 


11430 


200.025 


311.15 


508.00 


123.825 


203.20 


349.255 


558.805 


142.875 


215.90 


355.60 


609.60 


149.225 


219.075 


374.655 


660.405 


152.40 


244.475 


381.00 





5.2 Tolerances on bit diameter shall be as shown in 
Table 2. 

5.3 A typical configuration of air blast jet type rock 
bit is given in Fig, 6. 



AIR PORT 



AIR BLAST JET r 



PLUG WELD 
BALL PLUG 

AIR HOLE 
TO NOSE 

ROLLERS 

OUTER BALL 
RACE FLANGE 

CONE 




INNER BALL 
RACE FLANGE 



HARD FACING 
BUSHING 



Fig. 6 Details of Am Blast Jet Type Rock Bits 



IS 12635 : 2000 



Table 2 Tolerances on Bit Dia 

(Clauses 3.S, 3.9 and 5 2) 



Size 


in mm 

1 


Tolerance in mm 


' From 


To' 




73.025 


74.612 


+ 0.50 

- 0.00 


98.425 


311.15 


+ 0.80 
- 0.00 


349.25 


444.50 


+ 1.60 
- 0.00 


457.20 


660.405 


+ 2.40 
- 0.00 



5.4 Leg Cone Assembly 

The individual rollers are assembled on the leg with 
the help of balls and rollers. The grease of proper 
quality shall be used for efficient functioning of the 
wearing system. The cones after fitment shall be 
plugged with the help of retaining plug (see Fig. 8). 

6 NOZZLE SIZES 

6.1 The diameter of the nozzles shall be as specified 
by the purchaser or shall suit the design specification. 
The sizes of nozzles shall, however, depend on sizes 
of bits. 

6.2 The nozzle sizes and numbers shall be as per the 
design criteria to suit the customer requirements. 

6.3 In case of shallow drilling the provision of one 



central nozzle can also be adopted depending on 
customer requirement (see Fig, 7). 

7 WELDING 

7,1 For welding three leg-cone sub-assemblies, the 
selection of weld material shall be such that the joint 
shall have a greater strength than the parent material. 

7.1.1 The welding preparations on the legs shall be 
done before the leg-cone sub-assembly. 

7.1.2 The welded joints shall be free from surface 
cracks. Non-destructive crack detection method shall 
be used for the inspection of the joints. 

8 METHOD OF GAUGING THREADS 

Threads of rock roller bits shall be gauged with 
working gauges. The working gauges shall be 
calibrated at suitable intervals with the help of master 
gauges. 

9 ROCK BIT ORDERING 

It is necessary that the purchaser shall give full 
particulars of the rock bit while placing the order. The 
following specifications shall be given: 

a) Size 

b) Pin connection, 

c) Size of nozzle and number of nozzles, and 

d) Type of bit. 

10 MARKING 

The bit shall be marked on the top of the thread face 





Fig. 7 Detail of Nozzle 



IS 12635 : 2000 



and shall contain legibly and permanently the 
following details: 

a) Bit sizes in mm, 

b) Thread connection, 

c) Manufacturer's serial number, and 

d) Manufacturer's designation {see Fig, 1 and 2). 

NOTE — Bits for drilling different strata nnay be used as 
recommended by the manufacturer and agreed to by the 
purchaser. 

11 PAINTING 

Bit shall be painted with a bright colour, such as, 
yellow, red, blue or green. 



12 PACKING 

12.1 Bit shall be packed in boxes made of material 
which is capable of protecting the bit, particularly the 
cutting structures of the bit, from damage during transit 
and storage. The thread connection shall also be 
protected by re-usable rubber plastic cap to avoid 
damage during transit and storage. 

12.2 The box containing the bit shall have on its 
outside the following information: 

a) Bit sizes in mm, 

b) Thread connection, 

c) Manufacturer's name and/or trade-mark, 

d) Manufacturer's serial number, and 

e) Manufacturer's designation/code for the bit. 



IS 12635 : 2000 




BEARING JOURNAL 



BEARING BALL 



BEARIN G 
ROLLER 



rL 



LEG PIN 



BALL HOLDER PLUG 



Fig. 8 Details of Leg Roller Assembly 



Bureau of Indian Standards 

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote 
harmonious development of the activities of standardization, marking and quality certification of goods 
and 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 of 
implementing 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 reviewed 
periodically; a standard along with amendments is reaffimaed when such review indicates that no changes are 
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards 
should 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. MED 21 (0277) 



Amendments Issued Since Publication 

Amend No. Date of Issue Text Affected 



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