Page 125 - Hitachi Power Tools 2015

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ABRASIVES / DIAMOND BLADES 121
ABRASIVES / DIAMOND BLADES
Wheel Configuration and Applications
Select from a variety of bonded abrasive wheel conigurations depending on type of tool being used, application and desired results.
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The bonding agent that holds the grains together determines the resistance of the wheel. Hitachi abrasives use a resinoid bond that is formulated to meet unique specifications of each product.
3. REINFORCEMENT
The reinforcement material provides extra strength to use the wheel at maximum RPMs and withstand lateral pressure that is applied during use. Hitachi uses multiple layers of long, stranded fiberglass that are woven to form an exceptionally strong reinforcement layer specific to the application.
COMBINING THE 3 COMPONENTS
During the manufacturing process, these three components are combined to form a grinding wheel. The grains and bonding agents are measured, combined and pressed in an automated hydraulic press. Hitachi abrasives labels are also incorporated into the manufacturing process and therefore remain intact throughout the life of the wheel.
GRINDING WHEEL SELECTION GUIDE
1. ABRASIVE GRAINS
Abrasive grains are particles of man-made abrasive compounds. While some manufacturers use recycled grains, Hitachi abrasives use only high quality, virgin grains that are made to our specifications. The chemical structure of the grains determine the physical properties of the grains (i.e., shape, sharpness, hardness, friability). Common grain types used in making bonded abrasives include:
A - Aluminum Oxide A coarse, blocky shaped grain best used for cutting and grinding metals, including ferrous metals without excessive fracturing.
C - Silicon Carbide A very hard and sharp abrasive suited for non-metallic materials such as concrete.
Z - Aluminum Zirconium A very fine, dense crystalline grain which, because of its durability, can be used for very rapid and aggressive stock removal.
SG - Seeded Gel High performance wheel made by a carefully controlled manufacturing process using aluminum oxide grains. Seeded gel abrasive wheels stay sharp the longest, and require the least maintenance.
2. BONDING AGENT
D = Diameter U= Thickness H = Hole Size
D U H
U
Cutting Surface
Grinding Surface
U
U
D = Diameter U = Thickness H = Hole Size
H
Type 1A
Type 1
Type 27
TYPBEL27EGNrinDdiInNgBGlending BLENDING
(ISO 41)
TYPE 1 Grinding Straight Wheel
TYPE 29 Grinding Blending Depressed Center Wheel Flexible Wheel / Flap Disc
TYPE 1A Cutting
CU
Stra
G
GRINDING GRINDING
T
ig
T
D H
U
D = Diameter U= Thickness H = Hole Size
D
H
U
Cutting Surface
= Diameter = Thickness = Hole Size
Grinding Surface
D = Diameter U = Thickness H = Hole Size
Tool best used at 30° angle. No cutting D
H
angle. This allows user one wheel for grinding and finishing D
Grinding Surface
Straight Wheel
Type 1A (ISO 41)
Used at a 90˚ angle for cutting only. No grinding.
Straight Wheel
Depressed Center Wheel
Type 27A
Depressed Center Wheel
Type 27
For use on lat surfaces for weld prep, usually on bar stock or angle iron. Tool best used at a 10˚-15˚ angle. No cutting.
Flexible Wheel / Flap Disc
Type 29
For blending and stock removal on uneven surfaces, best used at a 10˚ angle. This allows user to use one wheel to grind and inish with.
I
N
he
G
GRINDING
C
ht
Type 1A used at 90° angle for cutting only. No grinding Bench or Type 1 used for edge grinding at 50° or 90° angle. Not for cutting.
W
el
ed
Type 27A used at 90° angle for cutting only. No grinding
D
H
Bench or Type 1
Used for edge grinding at a 50˚-90˚ angle. Not for cutting applications.
To be used at a 90˚ angle for light cut-off work.
Type 27A
TYPE 27A Cutting
Type 29
D
ep
U
ress
C
T
T
I
en
N
ter
Wheel
Type 27 used on flat surfaces for weld prep, usually on bar stockoTr yapngele29irofonr. blending and stock removal on uneven surfaces, best used at 10°