plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
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Shape and position tolerances for shoulders and seats<br />
Spindle performance (rotational accuracy, heat level)<br />
depends to a large extent on the manufacturing<br />
quality of seats and their shoulders. To meet targets,<br />
these characteristics must be within the tolerances<br />
re<strong>com</strong>mended by SNR.<br />
T2<br />
AB<br />
T2<br />
AB<br />
A<br />
SHOULDER<br />
SHOULDER<br />
B<br />
Seating<br />
d1<br />
L<br />
Seating<br />
d2<br />
T1 T1<br />
T3 A<br />
Surface roughness (Ra)<br />
Seat 0,5 to 0,8<br />
A<br />
T5<br />
A<br />
Shoulder 0,8 to 1,2<br />
Seating<br />
D1<br />
SHOULDER<br />
L<br />
T4<br />
T6<br />
Seating<br />
D2<br />
A<br />
The shoulder<br />
diameter and<br />
fillet radii<br />
with the shaft seat<br />
and housing are<br />
specified on p. 40.<br />
Maximum tolerances in microns<br />
Nominal<br />
Shaft<br />
Housing<br />
diameter T1 T2 T3 T4 T5 T6<br />
of seat<br />
ISO 4 ISO 2 ISO 4 ISO 2 ISO 4 ISO 2 ISO 4 ISO 2 ISO 4 ISO 2 ISO 4 ISO 2<br />
10 to 18 1,5 1 2 1,2 0,013L (1) 0,008L (1) - - - - - -<br />
> 18 to 30 2 1 2,5 1,5 0,013L (1) 0,008L (1) 2 1,5 2,5 1,5 0,015L (1) 0,010L (1)<br />
> 30 to 50 2 1,5 2,5 1,5 0,013L (1) 0,008L (1) 2,5 1,5 2,5 1,5 0,015L (1) 0,010L (1)<br />
> 50 to 80 2,5 1,5 3 2 0,013L (1) 0,008L (1) 3 2 3 2 0,015L (1) 0,010L (1)<br />
> 80 to 120 3 2 4 2,5 0,025L (1) 0,013L (1) 3,5 2,5 4 2,5 0,030L (1) 0,015L (1)<br />
> 120 to 180 3,5 2 5 3,5 0,025L (1) 0,013L (1) 4,5 3 5 3,5 0,030L (1) 0,015L (1)<br />
> 180 to 250 4 2,5 7 4,5 0,025L (1) 0,013L (1) 5 3,5 7 4,5 0,030L (1) 0,015L (1)<br />
> 250 to 315 - - - - - - 6 4 8 6 0,030L (1) 0,015L (1)<br />
> 315 to 400 - - - - - - 6 4,5 9 7 0,030L (1) 0,015L (1)<br />
(1) L = distance between bearing units in mm<br />
59
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