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Note: The grinding head is the ideal tool for this operation. The grinding head may be
fitted with a green grinder (green silicon carbide) specially designed to sharpen carbide
tools
(Cobalt, tungsten, titanium, boron combinations) These carbides that are obtained with
a special heat treatment called sintering, are used in the form of disks or "inserts". The
latter are placed onto the tool body and attached by brazing using a special brazing
powder
. Characteristic angles:
(a+b+d=90°)
Metals and alloys to
be machined
Steel
Grey cast iron
Various bronzes
Aluminium
Chip breaker (Fig.2): When machining steel grades only, the tool cutting edge receives suitable
sharpening. The length l of the chip breaker varies according to the grade of steel and the pass
load:
For steel up to 50 kg/mm2.............. l= 3.5 mm
For steel of 55 to 75 kg/mm2.............. l= 3.0 mm
For steel of 80 to 95 kg/mm2.............. l= 2.5 mm
Remark. The depth or the height of the chip breaker does not vary, it is 0.5 mm (approximately).
Never heat the carbide and cool it regularly in water
Always pass the carbide plate support part over a fettling grinder.
WARNING: Always wear protective goggles while sharpening
114135-Manual-D-EN.indd 15
SHARPENING TOOLS
Metal carbides
LATHE TOOLS with metal carbide tabs
a, delivery angle.
b, sharpening slope
d, cutting angle.
Angle values a and b
/ Resistance R
kg/mm
2
up to 50 kg
50 to 60 kg
60 to 70 kg
70 to 80 kg
80 to 95 kg
© FAR GROUP EUROPE
Delivery
Sharpening slope
angle a
6°
22 to 25°
6°
18 to 20°
6°
15 to 18°
5°
12 to 15°
5°
10 to 12°
6°
7°
8°
25 to 30°
t
8 to 10°
5 to 6°
21/03/12 10:44:56
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