Characteristics of tips made of SF20T
(1)
|
Its durability in writing is far superior to those of brass (Cu+Zn) and nickel silver (Cu+Ni+Zn), normally from 1000 to 2000 meters in continuous line.
|
|
(2)
|
Smooth writing without scratching and bleeding, can be obtained to end.
|
|
(3)
|
Machining data ( Example )
|
|
|
|
|
Back-drilling
|
Front-drilling
|
|
Ball-point pen
|
Roller pen
|
Front-drilling
|
|
Drill
|
Shape
|
Twist Drill
|
Gun barrel drill
|
|
Materia
|
High speed steel
of hard metal
|
Hard metal
|
Hard metal
|
|
Point angle
|
118 Standard Type
|
|
Helix angle
|
30-35 Standard Type
|
-
|
|
Machining
Condition
|
Revolution
|
7000-15000 rpm
|
10000-15000 rpm
|
|
Feed speed
|
0.01-0.02mm/rev
|
-
|
|
Cutting oil
|
Low viscosity oil or oil which is effective even
at low temp maching are advisable.
|
|
Tool life
|
In case of hard metal,
1 to 2 million pieces.
|
In case of inserted
felt-type, approx.
0.5 mil. pieces.
|
0.3 to 0.5 mil. pieces.
|
|
|
[ Points for better disposal of chips ]
To produce smaller chips.
- To choose the matching condition which suppresses built-up edge.
- To choose cutting oil of low viscosity and to control its flow rate and spout angle, so that chips can be easily ejected, subsequently works can be entirely cleaned by
ultrasonic wave
(Note: In choice of cutting oil, chlorine concentration should be taken into consideration to avoid environmental problems such as skin poisoning.)
|
Available Sizes
|
1.60mm DIA
|
1.92mm DIA
|
2.00mmDIA
|
2.25mmDIA
|
2.30mm DIA
|
2.50mm DIA
|
|
2.52mm DIA
|
2.54mm DIA
|
2.56mm DIA
|
2.70mm DIA
|
3.20mm DIA
|
|
|
|
