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Norton
Diamond and CBN wheels are designed to grind very hard
materials like Tungsten Carbide, HSS, Hardened Steel, Aero
space alloys, Ceramics, Glass and Refractory materials to
a high level of precision and quality. Various factors affect
selection of the right Super Abrasive grinding wheel. Norton
Application Specialists will help you select the right product
fine-tuned to meet the exact application need. Norton also
offers a wide range of ex-stock Resin bond, Metal bond and
Electroplated wheels for tool regrinding and for job working
applications on Carbides, Tool Steels HSS, Ceramics, Glass,
and Refractory
materials. These range of Ex-Stock wheels are available off-the-shelf.
These wheels have been optimised in design for various wheel
factors like Diamond & CBN type, grit, concentration, bond,
and
grade to suit a variety of jobs. Norton can also offer you
tailor-made products to meet different job demands if a stock
wheel does not completely satisfy the application requirement.
| Typical
Applications |
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Norton CBN Wheels
High
Speed Steel
Alloy
Tool Steels
Super
Alloys
Case
hardened Steels |
Click for information on:
Norton
Diamond & CBN Wheels
How
To Designate
Norton
Range Of Standard Stock
Wheel
Care and Usage
Troubleshooting
Guide
SuperAbrasives
- Grinding Hints and Fault-Finding
Grinding
Parameters for Resin Bond Diamond & CBN Wheels
Guidelines
for Dressing and Truing
Different
Dressing Ratios For Bond Types
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Norton
Diamond and CBN (Cubic Boron Nitride) grinding wheels are
available in a wide range of Resin, Vitrified and Metal bonds.
| Typical
Applications |
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Norton
Diamond Wheels
Tungsten
Carbide
Hard
Alloys
Ferrites
& Ceramics
Wear
resistant Coating
Glass
Gem
stones
Plastics
Graphite
Cast
iron
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Truing
makes the wheel concentric with the spindle.
Dressing opens the wheel's cutting face.
Always true and dress diamond and CBN wheels pror
to use.
Diamond and CBN wheels of grit sizes 100-180 mesh
can be trued with a Brake Controlled Truing Device mounted
with37C wheels.
See Diamond and CBN Wheel Care and Usage section for
more details
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How To Designate
Norton
Diamond & CBN Wheels are fully designated by Wheel Type,
Abrasive, Mesh Size, Grade, Concentration and Bond Type. To
designate and order a special wheel fully, the following important
steps have to be followed:
1. Specify
wheel type
2. Specify
Abrasive type, mesh, concentration
3.
Specify
dimensions
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Specify Type Of Wheel:
1. Type of Wheel:
This indicates
the shape of the wheel and is typified by 4 digits.
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2. Specify Abrasive, Mesh Size,
Grade, Conc. :
Wheel
Type Abrasive Mesh
Size Grade
Conc Bond
Choose from
Choose Choose Choose Choose proper Choose
bond
chart diamond
or mesh size proper concentration Type
CBN Type
in
FEPA grade
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3. Specify Dimensions:
The important wheel dimensions
to be specified are
1 = Diameter of the wheel 'D'
2 = Width of the Abrasive Section W or V
3 = Depth of Abrasive X
4 = Overall thickness of the wheel T
5 = Bore of the wheel
H
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Norton
Range of Standard Stock
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Wheel Care and Usage
For achieving the best results
using Norton Diamond and CBN products, the following steps of
mounting, truing and dressing should be followed.
Mounting
---- putting wheel on machine spindle
Truing
---- making wheel round and concentric with the spindle axis
Dressing
---- opening the face of a trued wheel
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Mounting
- putting wheel on machine spindle
Examine wheel flanges and spindle carefully.
Inspect machine spindle for excessive runout.
Mount wheel between hand-tightened flanges.
Using a dial indicator, tap the wheel lightly with a rubber
or wooden block to minimize runout to less
than .0010".
Tighten flange securely and recheck with indicator.
Allow a newly mounted wheel to operate for one full minute before
grinding.
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Truing - making wheel round
and concentric with the spindle axis
Prior to truing the wheel, run a wax crayon over
the wheel face.
Any crayon left on wheel face after truing will reveal untrued
areas.
Norton Brake Controlled Truing Devices are most commonly used
to true Diamond and CBN straight, cup and cylinder
wheels
 Always
use Brake Controlled Truing Device wet.
Bring
the Diamond/CBN wheel and the truing wheel together until
they almost touch.
Start
the Diamond/CBN wheel to normal speed; start truing wheel
in the same direction.
Bring the two
wheels together until they touch.
Make sure the truing wheel is spinning at the time of contact.
Traverse the wheel back and forth at 30 to 60 inches per minute.
Bring grinding wheel down by .0005" to .001" at the end of
each traverse.
At the end of truing, the Diamond/CBN wheel should be smooth
and running true.
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Dressing-opening the face of
a trued wheel
Dressing sticks should be one or two grit sizes
finer than the Diamond/CBN Wheel and in H or J grade.
Properly Dressed Wheel Face
After Dressing
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Brake
Truing Device
For
best dressing results brake controlled truing device is used. |
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TroubleShooting Guide
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Problem
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Possible
Causes
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Suggested
Correction
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Burning
(excessive heat) |
Wheel
Loaded or glazed
Excessive feed rate
Wheel too durable
Poor placement of coolant
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Dress
wheel with a dressing stick
Reduce infeed of wheel or workpiece
Use freer cutting specification or slow down wheel speed
Apply coolant directly to coolant wheel/workpiece interface
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| Poor
Fininsh |
Excessive
dressing
Grit size too coarse
Poor coolant flow or location interface |
Use lighter
dressing pressure;stop dressing as soon as wheel starts
to consume stick rapidly
Select finer grit sizes
Apply heavy flood so it reaches wheel/workpiece |
| Chatter |
Wheel out
of truth |
True wheel,
ensure it is not slipping on mount |
| Short Wheel
life |
Incorrect
coolant flow
Low wheel speed
Excessive dressing
Wheel too soft or too hard
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Apply coolant
to flood wheel/work surface
Increase wheel speed
Use lighter dressing pressure
Change grit or grade, use higher concentration |
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SuperAbrasives - Grinding Hints
and Fault-Finding
Adhereing to the following suggestions will help ensure the
most efficient and cost-effective performance from super abrasive
products.
Avoid
Steel when using Diamond Wheels
Use
Rigid work support
Grind
Wet
Avoid
Excessive Feeds
Dress
Core |
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Avoid
steel when using Diamond Wheels
When using a diamond wheel try to keep the amount of steel ground
to an absolute minimum. On brazed tools, use an ALUNDUM wheel,
and back off the steel shank. A high lubricity grinding fluid
should be used. For some tool steels, armoured (AMD) diamond
wheel may prove most economical. |
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Use Rigid work support
All workpieces should be supported firmly during the grinding
process. Any amount of vibration will cause wheel wear and produce
chatter or wave marks on the ground surface. On work ground
between centres, be sure the centreholds are properly prepared.
Minimize work overhang. If the ground edge is supported by a
work finger, ensure the finger is strong enough to provide vibration-free
support. |
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Grind Wet
If at all possible, diamond wheels should be used with a full
flood coolant properly directed into the grinding zone. (Vitrified
bond diamond wheels should be used only with a flood coolant.)
Water with a rust inhibitor is recommended. When a flood application
cannot be used, try a mist or spray application. These systems
use compressed air to "atomize" water or soluble oil. The spray
is directed at the grinding zone and helps dissipate heat in
the workpiece and wheel. Although not as effective as the flood
procedure, it does increase wheel life and helps prevent heat
damage to the work. |
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Avoid Excessive
Feeds
Every grinding operation is different. What is an excessive
removal rate on one operation may be entirely acceptable on
another. Excessive feeds on a given operation will always cause
premature wheel wear. If you smell resin, reduce infeed because
you are burning up the bond. Excessively high feed rates are
characterized by:-
A harsh grinding sound
Chatter
Burn
Vibration Smell
High
wheel wear rate |
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Dress Core
As the abrasive section of a cup wheel wears, the core material
(that part of the superabrasive wheel which holds and supports
the abrasive bearing section) may become exposed. The core materials
should not contact the workpieces during grinding as they cause
heat build up. However, some core materials as in some 11V9's
are self dressing. A single point carbide or steel tool is the
best way to dress reasloy core. The tool is clamped in a vise
with its cutting edge directed accurately to remove enough core
material to leave a 1/16" of abrasive section exposed. |
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Grinding Parameters For Resin
Bond Diamond & CBN Wheels
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Guidelines
For Dressing And Truing
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Different Dressing Ratios For Bond Types
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