Operation
Version 1.0 - 2020-12-10
36
Translation of original operating instruction
GT22
EN
GT22_G
B_4
.f
m
Hardness grades:
The hardness of a grinding wheel is not the hardness of the individual abrasive grains, but the resistance of
the bond to the breaking of the abrasive grains.
With a soft grinding wheel, the abrasive particles break off the wheel slightly. In addition to the binding there is
also a fixing grinding function.
In the best case the blunting (grain breakout) and sharpening is balanced in the grinding process. This is an
important prerequisite for a better grinding effect.
Codes:
A through D: extremely soft
E to G: very smooth
H to K: soft
L to O: medium
P through S: hard
T to Z: extremely hard
Structure:
The structure describes the volume proportion between grain, bond and pore, the distance between the indi-
vidual abrasive grains. The closer the grains lie together, the denser the structure and the smaller the pores.
The structure is given in numbers from 1 to 18. Small numbers indicate small grain spacing, high numbers in-
dicate large grain spacing.
1 to 4 ; Tight
5 to 7 ; Normal
8 to 11 ; Open
12 to 18 ; Very open
The loss of the wheel structure has a direct effect on the grinding performance and the grinding
quality. During grinding, the pore not only receives grinding dust, but also brings cooling water
and air into the grinding area to cool down and reduce heating, deformation and burning of the
workpiece. If the pores are large, the proportion of grain per area is reduced and the surface of
the grinding wheel becomes rougher. This influences the surface quality during the grinding
process. Normally, medium-sized structures are chosen.
Grain size
Application area
14 - 24
Grinding steel ingots, grinding iron burrs
36 - 60
Grinding standard surfaces
60 - 100
Fine grinding and edge grinding
120 - 600
fine grinding, honing, screw grinding
Over 180
fine grinding, polishing, mirror finish grinding
Degr
ee
Super
soft
Soft
1
Soft
2
Soft
3
M
Soft
1
M
Soft
2
M
1
M
2
M
Hard
1
M
Hard
2
M
Hard
3
Hard
1
Hard
2
Super
Hard
Code
0
G
H
J
K
L
M
N
P
Q
R
S
T
Y
