tornos DECO 7/10 - Page 80

OPTIONS & ALLIED TOOLING − DECO 7/10 − DECO 7a/10a − DECO 7e/10e
300236 en − 02/07 Chap. 11.5 /10
OPERATING RANGE OF NSK SPINDLE FOR MILLING ATTACHMENT MOUNTED IN T33
cont.
Attachment: AM−300 motor (30000 rpm) + RA−100 90° spindle (ratio 1:2.67; Theor. Speed 11235 rpm)
+ ARG−01 speed reducer (Ratio 1:3.92; theor. speed 2866 rpm)
Stock: MS 58 A brass
Cutter: Ø 35 mm carbide slitting saw
Item
Cutter
thickness
[mm]
Milling
length
[mm]
Cutter
Ø
[mm]
Cutter
speed
[rpm]
feedrate
max.
[mm/rev]
Comment Result
12 0.5 6 2 12000 0.015 Cross slotting
Maximum feedrate before freezing.
Over 0.02 mm/rev, cutter jams because
it is seized by slot edges.
13 0.5 10 2 12000 0.1
Cross slotting
Note: A higher feedrate (0.1 mm/rev)
is better because 10 mm can be cut
due to inertia without problems.
OK, no spindle freezing.
Below 0.1 mm/rev, slot edges seize
cutter from 6 mm length on.
14 0.5 10 2.8 12000 0.1 Cross slotting
Bad!
Cutter vibrates on 2.8 mm Ø.
Conclusion:
It is very difficult to determine the operating range of the attachment.
The best way is to start cutting at a low feedrate and to accelerate progressively while listening to the noise produced by the
NSK spindle.