Grinding wheel nomenclature

1. Nomenclature of
grinding wheel
Prepared by,
J.A.Prajapati
Guided by,
Tarun D. modi

2. Definition
• A grinding wheel is a multitooth cutter made up of many hard
particles known as abrasives which have been crushed to leave
sharped edges for machining.
• Every grinding wheel has two constituents
1. Abrasive used for cutting
2. Bond that holds abrasive grains.

3. Nomenclature of the grinding wheel

4. 1 . Symbol Of Manufacturer
• Manufacturer symbol is denoted by “51”
• It is not compulsory.
• The manufacture specifies particular quality of abrasives by it.

5. 2. Types of abrasive
• It is specified by english letters.
• Types of abrasive grains,
1. Natural grain (Diamond, Quartz, Sand)
2. Artificial grain (Synthetic diamond, Tin oxide, Aluminum oxide,
Silicon Carbide)
3. Super abrasives grain
• The aluminium oxide is specified by letter 'A' and silicon carbide by
letter "C“.
• From which one can ascertain the type of abrasive grain used to produce
the wheel.

6. 3.Grain Size
• Grain size affects the quantity of material removed & surface
quality obtained.
• The grain size selected is based on product material, type of
grinding process, required surface finish and material to be
removed from the job surface.

7. 3. Grain size
SR. NO. SIZE TYPE APPLICATIONS
1
10,12,14,16,20,24 Coarse Rapid material removal
2
30,36,46,54,60 Medium
Stock removal and finish
both
3
80,100,120,150,180 Fine
Less stock removal, high
surface finish
4
220,240,280,320,400,
500, 600
Very fine
Very high surface finish,
grinding hard materials.

8. 4 . Grade
• The grade is referred to as the hardness of the wheel.
• The abrasive grains in the grinding wheel are bound together by
the bonding material.
• Very soft : A B C D E F G
• Soft : H I J K
• Medium. : L M N O
• Hard : P Q R S
• Very hard : T U V W X Y Z

9. 5 . Structure
• The greater is the bond content, stronger bond material makes
the wheel harder.
• Harder grade wheels are used for heavy metal removal & for
precise grinding of softer materials.
• When area of contact between work & wheel is less, we can use
the harder wheels.
• Softer grade wheels can be used for harder materials for light
metal removal.

10. 5 . Structure

11. 6 . Type of bond
• This is used to hold the abrasive particles together to form the
wheel.
• Types of bond :
1. Vetrified bond (V)
2. Mineral bond (S)
3. Organic bond (B)
4. Rubber bond (R)

12. 7 . Manufacturer’s mark to identify
the grinding wheel
• It is not compulsory.
• It is the symbol given by the manufacturers wheel for its
identification.

13. Example of nomenclature of grinding wheel
• 51A36L5V23 grinding wheel has :
• 51 : Symbol of manufacturer
• A : Type of abrasive (Aluminium oxide)
• 36 : Grain size (Medium)
• L : Grade (Medium)
• 5 : Structure (Dense)
• V : Type of bond (Vitrified bond)
• 23 : Mark of manufacturer.

14. Links
• https://youtu.be/DQ93WxLd6kQ
• https://youtu.be/p9mMFsQu-NA

15. Thank you