الوصف

Detailed Technical Specification: Annexure -I
Sl.No. Description Parameter
1 STANDARDS :
1.1 Specification standard of drill bits conforms to IS:********8
1.2 For Tungsten Carbide Tips IS:********7
1.3 For Brazing material IS:********5
2.0 TECHNICAL PARAMETERS :
2.1 Type of Drill Bits TCT Rotary Drill Bit (Type-
A, one piece bit).
2.2 Grade of Tungsten Carbide Tips as per IS:***5 at
Sl.No. 2.2. Medium
2.3 Colour code Medium -Coal Yellow
2.4 Rake angle + 3 Deg.
2.5 Brazing material as per ISS mentioned at Sr.No.
2.3
Silver copper alloy of
classification, BA Cu Ag *2
2.7
(A) Guaranteed meterage for drilling by Grade 'C'
and superior grades in Coal **0 Meters
(B) Guaranteed meterage for drilling by Grade 'D'
and below grades in Coal **0 Meters
2.8 Nominal size of Drill Bits :
Item No. Drilling
Material Nominal size
1 Coal *3 mm
2.9 Make of Tungsten Carbide (T.C.) Tips : KT