Technical Data／Diamond・CBN Grinding Wheel
About Truing and Dressing
Wheel Size and Model Designation
Truing and dressing are very important to effectively use Diamond / CBN wheels so that they fully demonstrate their excellent performance. No matter how precisely the wheel is attached to the machine, runout occurs at the initial stage after installation. Also, the abrasive grain layer deteriorates in accuracy and sharpness decreases due to wear in the grinding process. To maintain good sharpness, truing and dressing with a method and condition suitable for the grinding wheel is required.
Example of Wheel Size Label
■Cup Wheel (6A2)
■Straight Wheel (1A1)
φ150 - 5T - 3X - φ25.4H
φ150 - 3W - 5X - φ40H
Outside Diameter
Grain Layer Width
Grain Layer Thickness
Mounting Hole Diameter
Outside Diameter
Grain Layer Width
Grain Layer Thickness
Mounting Hole Diameter
Immediately after installing the equipment, correcting circumferential runout is required. Crushing and falling off of abrasive grains reduce sharpness.
Eliminate irregularities on the abrasive surface, as well as runout, and create perfect circle (truing)
Retract bond and project the cutting edge (dressing)
Identification Method of Wheel Shape
The shape labelling method of the super abrasive wheel is specified by "Japan Industrial Standard JIS B 4141."
③Abrasive Layer Position & Symbol Reference to B ④Modification & Symbol
① ②
③ ④
Symbol
Position
Diagram
Symbol
Modification
Diagram
B Spot Facing Hole C Countersinking Hole H Straight Hole M Straight & threading hole P Relief at one side
6
A
2
C
1
Periphery
Bond
Bond
①Standard Body Shape
2
Side
Abrasive
Abrasive
1
９
3 Both Sides
2
11
Insert of abrasive layer
45°~ 90°
Q
Incline or roundness, inside Incline or roundness, outside Part of Periphery
3
12
4
Relief at both sides Segmented abrasive layer
R
under 45°
Truing
Dressing
4
14
To mold when the grinding surface sways while the wheel is rotating or when the shape has collapsed. ■Problems When Truing is Not Performed ・Burn, tactile mark, poor shape, short life, deteriorate of surface roughness
To remove unnecessary bond and chips on the surface, letting abrasive grains project. ■Trouble if Dressing was Not Performed ・Burn, increase of machining resistance, deterioration of surface roughness, decrease of work efficiency
5
S
6
15
SS Slot segmented abrasive layer T Threading hole
6
②Cross Sectional Shape of Abrasive Layer
A
D
FF
L
7 Part of Side
■Example of Selecting Conventional Whetstone for Truing Abrasive Grain Size ～♯140 ♯170〜♯270 ♯325〜♯500
AH
DD
G
LL
S
♯600〜 GC500 GC300
Reverse attachment of abrasive layer
8
Whole
Resin
C80 C80
WA120
GC300 WA120
V
B
E
H
M
U
Metal, Vitrified
C80
9
Edge
W With shaft
C
EE
J
P
V
■Example of Selecting Conventional Whetstone for Dressing Abrasive Grain Size ～＃170
Reverse insert of abrasive layer
Y
10
Internal
CH
F
K
Q
Y
♯200〜♯270 ♯325〜♯500 ♯600〜♯1000 ♯1500〜
Resin
WA200 WA120
GC300 WA300
GC500 WA300
GC1000 WA500
GC1500 GC800
■Standard Wheel Shape 1
■Standard Wheel Shape 2
Metal, Vitrified
1A1／Straight
1A1R／Cutting
6A2／Plain cup
6A2S／Segment cup
D
■Compliance Table of Diamond / CBN Wheels Truing and Dressing
D
D
D
W
W
X
X
Truing
Dressing
H
H
H
Diamond Wheel
CBN Wheel
Diamond Wheel
CBN Wheel
◎：Best ○：Good △：Possible Blank：No Suitable
H
Truing Method and Tool
B
M V
B
M V
B
M V
B
M V
D W 11A2/11B2／Flair cup
1A1RSS／Cutting saw
3A1/14A1／Straight with boss
11C9/11Y9／L-shaped flair cup
D
Rotary Dresser
◎ ◯ ◎ ◎ ◯ ◎ ◎
◎ ◯
D
D
X
X
W
Metal Wheel
◯ ◯
◎ ◯ ◎ ◯
◎ ◎
Rotary
H
H
X
Electroplated Arbor Dresser Single Stone Dresser Multi-Stone Dresser Impregnated Dresser High Precision Block Dresser Electroplated Block Dresser
H
H
Diamond Tool Method
1F1/1FF1／Straight with R
1V1／Straight with angle
6A9/11V9／Corner cup
12A2／Dish
◎ ◎ ◯
◎ ◎ ◯
D
D
D
D
X
X
X
W
Stationary
H
◯
◯
H
H
H
◯
◯
◯
◯
D X 1EE1/1E6Q／V face
4B2／One side V face
11V2S／Wedge-shaped segment cup
9A3／Both side cup
Block Grinding Brake Control Cup Wheel Drive
◯◯◯◯◯◯◎◎◯◎◎◯ ◎◎◎◎◎◎◯◯◯◎◎◯ ◯◯◯◯◯◯◎◎◯◎◎◯ ◎◯△◎◯△◯◎◯◎◎◯ ◯△△◯△△◯◎△◯◎△ ◎△△◯△△◯◎△◯◎△
D
D
D
Conventional Grinding Wheel Method
Rotary
W
45̊
W
W
H
H
H
H
Stationary Stick
H
Rotary
Mild Steel Roll
1Q1/1L1／Chipbreaker
9U1／U-shaped straight
3A2／Core drill
3V2T／Chamfering
Mild Steel Method Crushing Method
L
D
L
Stationary Mild Steel Block
D
B
X
Use together with core dri（ll 3A2）
X
W
X
X
Crushing Roll
◯ ◎
◯ ◎
H
Abrasive Grain Lapping Abrasive Grain Blasting
◯◯◯◯◯◯△△△△△△
H
Loose Abrasive Grain Method
△ ◯
△ ◯
△ △ △ △ △ △ ◯ ◯ △ ◯ ◯ △
3F2／Curve generator
1DD6Y／Centering
1FF6Y/1EE6Y/1LL6Y/1DD6Y／Pencil edge
L T W／Internal with shank
Abrasive Grain Sludge Pouring
X
X
D D 1
X
D D 1
Electric Discharge Method
X 45̊
X
Electrode
◎
◎
◎
◎
X
X
45̊
H
H
B :Bakelite (Resin), M :Metal, V :Vitrified (Ceramics)
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