|
Grinding Condition
|
Abrasive
|
Grain Size
|
Grade
|
Structure
|
Bond
|
Invariable
Grinding
Condition
|
Material
of Work piece. |
 |
"A"
for tensile strength above 30 kg/mm2, such as general
mild steel. |
|
"WA"
for tensile strength above 50 kg/mm2, such as chilled
steel. |
|
"DA",
"RA", "DR", "32A"
for hard and difficult grinding alloy steel. |
|
"C"
for tensile strength below 20 kg/mm2, such as cast
iron, nonferrous metals and metalloid. |
|
"GC"
for super hard alloy and gem. |
|
|
Coarse grain
for soft and expandable material. |
|
Fine grain for
hard and brittle material. |
|
|
Hard grade for
soft work piece to grind. |
|
Soft grade for
hard work piece to grind. |
|
Soft grade for
very soft copper, zinc and iron. |
|
|
Rough and open
structure for soft and adhesive (sticky) work piece
to grind. |
|
Fine and dense
structure for hard and brittle work piece to grind. |
|
|
Reservation
of stock-removal, and precision
required and grinding efficiency with the method of grinding
operation
|
|
"A",
"AZ" for heavy duty and free grinding. |
|
."GC"
for mirror grinding and polishing. |
|
|
Using #10-30
of coarse grain for better efficiency and the bigger
reservation of stock-removal. |
|
Mixed grit with
#243, #303 for the higher grinding efficiency and
the better grinding surface. |
|
Using fine grain
for precision grinding with small stock-removal
reservation. |
|
|
Hard grade for
handheld and other grinding. |
|
Middle or soft
grade for precise grinding. |
|
|
Rough and loose
tissue for the high rinding expenses of coarse grind. |
|
Fine tissue
for precisely polishing grind. |
|
|
Vitrified Bond
for rough and medium finishing. |
|
Resinoid Bond
(B) and Rubber Bond (R) for fine finishing. |
|
Resinoid Bond
(B) for heavy duty and free grinding. |
|
| Contact
Area. |
|
|
Fine grain size
for the smaller contact area. |
|
Coarse grain
size for the larger contact area. |
|
|
Hard grade for
the smaller contact area. |
|
Soft grade for
the larger contact area. |
|
|
Fine structure
for the smaller contact area. |
|
Rough and loose
structure for rough grain size. |
|
|
Invariable
Grinding
Condition
|
Peripheral
Speed of Wheel. |
|
|
|
Soft grade for
high peripheral speed. |
|
Hard grade for
low peripheral speed. |
|
|
|
Using
Vitrified Bonded Wheel for peripheral speed below
2000M/min. |
|
Using Resinoid
Bonded wheel for peripheral speed above 2000M/min. |
|
| A Speed
of Grinding Work piece. |
|
|
|
Hard
grade for high working speed. |
|
Soft grade for
low working speed. |
|
|
|
In-feed
or
Grinding Weight (Pressure).
|
|
|
|
Hard
grade for the greater in-feed. |
|
Soft grade for
the less (small) in-feed. |
|
|
|
Resinoid
Bonded wheel using on those machines which running
with the more in feed or bigger grinding pressure. |
|
| Machine
status. |
|
|
|
Soft
grade for good rigidity and the small vibration. |
|
Hard grade for
the more vibration. |
|
|
| |
Making
use of Resindoid bonded wheel can usually attain
a good result on machine with the more vibration. |
|
| Grinding
fluids are used or not. |
|
|
|
Choosing
one grade harder than dry-grinding for wet grinding. |
|
Choosing one
grade softer than wet-grinding for dry grinding. |
|
|
|
| Operators
are proficient or not. |
|
|
|
Soft
grade for proficient operators. |
|
Hard grade for
non proficient operators. |
|
|
|
