Page 272 - Fitter 1st Year TT
P. 272
పారి మాణిక్ మారి్కంగ్ వయావస్థను వివరించే చ్ధర్్ట : 551-1966 (ట్ేబుల్ - 2)
ట్ేబుల్ 2
ORDER OF MARKING
3 1 2 3 4 5 6
Nature of Type of Grain Grade Structure Type of Manufacturer’s
Wheel Abrasive Size bond Reference
51 A 36 L 5 V 23
Manufacturer’s Manufacturer’s
symbol indicating own identification
the exact nature of mark for the
Abrasive (optional) wheel (optional)
ALUMINIUM OXIDE – A
SILICON CARBIDES – C
V – VITRIFIED
S – SILICATE
R – RUBBER
RF – RUBBER REINFORCED
B – RESINOID (SYNTHETIC RESINS)
BF – RESINOID REINFORCED
E – SHELLAC
Mg – MAGNESIA
COARSE MEDIUM FINE VERY FINE
10 30 220
12 36 80 240
14 46 280
16 54 100 320
20 60 120 400 SPACING FROM THE CLOSEST
24 150 500 TO THE MOST OPEN
180 600 0 8
1 9
2 10
3 11
4 12
5 13
6 14
7
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
♦ ∅ ♦ ∅ ♦ ∅
SOFT MEDIUM HARD
CHART ILLUSTRATING STANDARD MARKING SYSTEM IS : 551 – 1966
252 CG & M : ఫిట్్టర్ (NSQF - రివ�ైస్డ్ 2022) - అభ్్యయాసం 1.5.74 - 76 కోసం సంబంధించిన సిద్్ధ ధా ంతం
