Page 495 - NORTON cutting-off and grinding wheels - industrial
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TECHNICAL
INFORMATION
495
TECHNICAL INFORMATION
CONCENTRATION
The concentration is defined by a standard and indicates the weight of abrasive (in carats) contained
in 1cm
3
of abrasive strip – 1 carat = 0,2 grams.
CONCENTRATION*
NUMBER OF CARATS/cm
3
ABRASIVE WEIGHT PER cm
3
DIAMOND ABRASIVE
CBN ABRASIVE*
100
=
W
4,4
=
0,88g/cm
3
75
=
T
3,3
=
0,66g/cm
3
50
=
Q
2,2
=
0,44g/cm
3
* Other concentrations available upon request
SELECTION OF CONCENTRATION
The choice of concentration depends on the machining parameters:
HIGH CONCENTRATION
MEDIUM OR LOW CONCENTRATION
Roughing operations
Finishing operation
Powerful machine
Low power machine
Small contact area
Large contact area
Retention of profile or sharp edges of wheel
Cutting without temperature rise
OPERATION INTERNAL GRINDING EXTERNAL GRINDING SURFACE GRINDING
SHARPENING
Diamond
100
75
50
50/75
CBN
W
T
Q
Q/T
COOLANT
Generally speaking, working with coolant is preferable to working without coolant because the coolant
reduces friction and dissipates heat generated by machining.
However, many sharpening operations are performed without coolant under good conditions and with
appropriate bonds.
Choice of coolant:
•
DIAMOND wheel = pure water + 1,5% rust inhibitor or soluble oil
•
CBN wheels = pure oil or water, always with 5 to 10% soluble oil
•
For CBN wheels, changing from soluble oil to pure oil increases the service life of the wheel
MOUNTING, TRUING & DRESSING
To achieve the best results using Norton Diamond and CBN products, the following steps for mounting,
truing and dressing should be practised:
MOUNTING PUTTING WHEEL ON MACHINE SPINDLE
•
Examine wheel flanges & spindle carefully
•
Be sure flanges’ surfaces are clean & free of damage
•
Ensure that the mounting flanges are flat & of equal diameter, especially on wheels with rigid centres,
such as vitrified bond wheels
•
Inspect machine spindle for excessive runout – TIR (Total Indicated Runout) should be no greater than
5 microns
