Fits of main elements

1. Straight spur gear on the shaft - ;

2. Helical spur gear and worm gear on the shaft - ;

3. Bevel gear on the shaft - ;

4. Coupling and gear located on a cantilever portion of the shaft - ;

5. Pulleys or sprockets - ;

6. Commercial seals - h 11;

7. Inner ring of a bearing - k 6;

8. Outer ring of a bearing - H 7;

9. The width of a keyseat in the shaft - P 9;

10.The width of a keyseat in the hole of a hub - J_S 9.

During treatment of the shaft besides errors of linear dimensions errors of geometrical shapes and errors of surfaces disposition arise.

Possible errors of geometrical shapes are non-cylindrical surfaces, non-rounding, non-flatting.

For shaft portions and gear holes tolerances of cylindrical surface should be taken into account. Sign /○/ marks tolerance of cylindrical surface. The magnitude of this tolerance is determined as 0.3· t ·10^-3, where t is diametrical tolerance range in micrometers (table 14.2).

Table 14.2