1. DIMENSIONING AND TOLERANCING

2. prismatic.sldasm

3. DIFFERENT TYPES OF FIT Clearance fit
Limits of size defined such that a clearance always results when mating parts are assembled
Interference fit
Limits of size are so prescribed that interference always results when mating parts are assembled.
Transition fit
Limits of size are so prescribed that either clearance or an interference may results when mating parts are assembled
Line fit
Limits of size are so prescribed that surface contact or clearance may result when mating parts are assembled

4. BASIC HOLE SYSTEM
In the basic hole system the minimum (lower limit) hole size is taken as the basic size.
Stock hole is made “first” and then shaft is made to particular type of fit (to suit the hole).

5. BASIC SHAFT SYSTEM
In the basic shaft system the maximum (upper limit) shaft size is taken as the basic size.
Stock shaft is created “first” and hole is made to particular type of fit (to suit the shaft).

6. IDENTIFY FIT SYSTEM Basic shaft or basic hole?
In the basic hole system the minimum (lower limit) hole size is taken as the basic size.
Stock hole is made “first” and then shaft is made to particular type of fit (to suit the hole).
In the basic shaft system the maximum (upper limit) shaft size is taken as the basic size.
Stock shaft is created “first” and hole is made to particular type of fit (to suit the shaft).

7. IDENTIFY FIT SYSTEM
“Shaft”
“Hole” - = - =
What type of fit is this?

8. IDENTIFY FIT SYSTEM

9. IDENTIFY FIT SYSTEM Basic hole More commonly used Basic shaft
Less commonly used

10. Shown are limit tolerances
IDENTIFY FIT SYSTEM
Shown are limit tolerances

11. Surface roughness for different manufacturing methods

13. Φ
Basic hole fits

14. Φ
Basic shaft fits

15. Description of preferred fits

16. ANSI PREFERRED HOLE BASIS METRIC CLEARANCE FITS
Pages 312, 313, 314, 315
ANSI PREFERRED SHAFT BASIS METRIC CLEARANCE FITS
Pages 316, 317, 318, 319
Engineering Design Graphics
James Leake
Jacob Borgerson

17. cylindrical_metric.sldasm
Nominal diameter 25mm
Btw. what is wrong with this assembly?
cylindrical_metric.sldasm

18. Loose running fit for nominal diameter 25mm preferred hole basic

19. Free running fit for nominal diameter 25mm preferred hole basic

20. Close running fit for nominal diameter 25mm preferred hole basic

21. Sliding fit for nominal diameter 25mm preferred hole basic

22. Locational transition fit for nominal diameter 25mm preferred hole basic

23. Locational transition fit for nominal diameter 25mm preferred hole basic

24. Locational interference fit for nominal diameter 25mm preferred hole basic

25. Medium drive fit for nominal diameter 25mm preferred hole basic

26. Force fit for nominal diameter 25mm preferred hole basic

27. Hole is always the same: H7
We obtained the desired fit by changing shaft tolerance