1. Limit, Fit & Tolerance – Numerical Problems

2. A medium force fit on a 75 mm shaft requires a hole tolerance and shaft tolerance each equal to .225 mm and an maximum interference of mm. Determine the proper hole and shaft dimension with the basis hole standard.

3. A medium force fit on a 75 mm shaft requires a hole tolerance and shaft tolerance each equal to .225 mm and an maximum interference of mm. Determine the proper hole and shaft dimension with the basis hole standard.
Minimum diameter (lower limit) of hole:
Dmin = 75 mm
Maximum diameter (higher limit) of hole:
Dmax = = mm
Minimum diameter (lower limit) of shaft:
dmin = Dmax + maximum interference
dmin = = mm
Maximum diameter (higher limit) of shaft:
dmax = dmin + tolerance = = mm

4. 2. A 75 mm shaft rotates in a bearing
2. A 75 mm shaft rotates in a bearing. The tolerance for both shaft and bearing is mm and the required allowance is 0.10 mm. Determine the dimension of the shaft, and the bearing bore with the basis hole standard.

5. 2. A 75 mm shaft rotates in a bearing
2. A 75 mm shaft rotates in a bearing. The tolerance for both shaft and bearing is mm and the required allowance is 0.10 mm. Determine the dimension of the shaft, and the bearing bore with the basis hole standard.

6. 3. In a limit system, the following limits are specified to give a clearance fit between a shaft and a hole:
Determine:(a)basic size (b) shaft and hole tolerance (c) the maximum and minimum clearance

7. 3. In a limit system, the following limits are specified to give a clearance fit between a shaft and a hole:
Determine:(a)basic size (b) shaft and hole tolerance (c) Shaft and hole limit (d) the maximum and minimum clearance
Basic Size: 30 mm
Shaft tolerance:
Tolerance = upper limit – lower limit = – (-0.018) = mm
Hole Tolerance = 0.02 mm
(c) Shaft Limit: High limit (dmax) = = mm
Low Limit(dmin) = = mm
Hole Limit: High Limit (Dmax) = = mm
Low Limit (dmin) = 30 mm
(d) Maximum Clearance = Dmax- dmin = – = mm
Minimum Clearance = Dmin – dmax = 30 – = mm

8. 4. . A hole and shaft have a basic size of 25 mm, and are to have a clearance fit with a maximum clearance of 0.02 mm and a minimum clearance of 0.01 mm. The hole tolerance is to be 1.5 times the shaft tolerance. Determine: limit for both hole and shaft (a) using a hole basis system (b) using a shaft basis system.

9. 4. . A hole and shaft have a basic size of 25 mm, and are to have a clearance fit with a maximum clearance of 0.02 mm and a minimum clearance of 0.01 mm. The hole tolerance is to be 1.5 times the shaft tolerance. Determine: limit for both hole and shaft (a) using a hole basis system (b) using a shaft basis system.