plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
plaquette MACHLINE - Ntn-snr.com
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Tolerances and precision classes<br />
Component tolerances -<br />
spacers and clamping nuts<br />
Rotational accuracy of the spindle also depends on manufacturing precision of spacers and nuts.<br />
Spacers<br />
Clamping nuts<br />
A<br />
L1<br />
T1<br />
A<br />
T2<br />
C<br />
C<br />
B<br />
L2<br />
T1<br />
B<br />
Ø Bearing seat dia.<br />
Spacers must be rigid enough to avoid any bending<br />
during tightening. They should be no longer than<br />
200 mm. Tolerances for their alignment and length<br />
differences are specified below.<br />
Whether the nut is threaded or pressed on, its<br />
clamping face must be perpendicular to the bearing<br />
seat. The axial run-out tolerance of the face is<br />
specified below.<br />
Maximum tolerances in microns<br />
Nominal bore<br />
of spacer<br />
or nominal diameter<br />
of bearing seat<br />
Spacer<br />
Nut<br />
Difference in length<br />
T2<br />
T2<br />
between L1 and L2<br />
ISO4 ISO2 ISO4 ISO2 ISO4 ISO2<br />
10 to 18 2 1 2 1 5 3<br />
> 18 to 30 2 1 2 1 6 4<br />
> 30 to 50 2 1 2 1 7 4<br />
> 50 to 80 2 1 3 2 8 5<br />
> 80 to 120 3 2 3 2 10 6<br />
> 120 to 180 3 2 4 3 12 8<br />
> 180 to 250 4 3 5 4 14 10<br />
60
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