
B-65292EN/03 INSTRUCTION 3.ROTOR
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3.1 MACHINING AND FINISHING
Method
When machining the inner surface of the
rotor, chuck the outer surface of the
rotor based on the outer surface as
shown in the figure.
As shown in the diagram, if the rotor is
gripped by a divided jig, the chucking is
more stable. Further, when the stroke of
the tool axis is sufficiently longer than
the rotor length, finish the rotor without
changing the grip.
Precision
Outer and inner diameter of the rotor must be finished in the precision
shown bellow.
Inner diameter (Machine the rotor alone.)
Circularity
20µm or better
Cambe
30
m or bette
Camber measuring (reference)
Outer diameter (Machine after shrinking with spindle.)
Roughness
12S or better
Circularity
40µm or better
Concentricity between rotor outer
diameter and spindle center
25µm or better
Cutting condition (Reference)
Roughing
Semi-finishing
Finishing
Standard
type
High speed
type
All types All types
Cutting speed
(m/min.)
40 35 50 50
Feed speed
(mm/rev.)
0.2 0.2 0.2 0.1
Depth of
cut(mm)
1 1 0.35 0.1
CAUTION
FANUC cutting conditions are shown above for reference. The above conditions do
not guarantee that the rotor can always be machined without problems under the
conditions. A rotor is made of layered silicon steel sheets up to 1 mm thick. A rotor
may easily be deformed (bend, crack between layers, or elongation along the
length) when machined with an unnatural method or cutting condition. In this case, it
is desirable to moderate the conditions or replace the tip a little earlier.
Indicator
V block