Task number 2
“Tolerances and fits of smooth cylindrical joints”
For a smooth cylindrical joint K6 / h7 of nominal diameter D = 115 mm, determine:
1. Limit sizes.
2. Tolerances.
3. The largest, smallest and average gaps.
4. Landing tolerance.
5. Executive sizes of limit calibers.
The location of the tolerance fields is depicted graphically.
Task number 3
“Tolerances and fit of rolling bearings”
For a radial single row bearing, construct tolerance field layout schemes indicating deviations. Loading is circulating. The shaft is continuous.
Initial data:
1. The accuracy class is 0.
2. The bearing number is 312.
3. Radial load R = 5000 N.
4. The nature of loading - C (with strong shocks and vibration).
Task number 4
"Calculation of dimensional chains"
Draw a dimensional chain diagram for the assembly shown in fig. 3. Based on the given nominal values ​​of dimensions and tolerance fields of the component links A1, A2, A3, A4 (Appendix), determine the nominal value, limit deviations and tolerance of the closing link AΔ under conditions of complete interchangeability.
Initial data:
A1 = 140 H11; A2 = 40 H9; A3 = 12 h12; A4 = 150 h12
Task number 5
"Tolerances and fittings for threaded joints"

For threaded interfaces (metric threads) according to the specified thread size and pitch, tolerance fields of the thread of the bolt and nut (Appendix), determine the maximum dimensions of all interface elements, as well as give a diagram of the location of the tolerance fields of the bolt and nut.
Initial data:
The nominal diameter of the thread d is M20 mm.
Thread pitch P = 1.5 mm.
The bolt tolerance field is 7e6e.
The tolerance field of the nut is 4H5N.
Task number 6
“Tolerances and fits of splined joints”

For a movable spline connection with a given nominal size of 10 x 72 x 78 mm, select a centering surface, select fit, build a layout of the tolerance fields of the connection for all elements, give an assembly drawing of a spline connection.
Initial data:
1. The nature of loading - U (moderate).
2. Centering accuracy - N (low).
3. Guidelines for heat treatment - the shaft is heat treated.

OPTION 25