4. How to discriminate the interference fit clearance fit and transition fit? 17
ID: 1868192 • Letter: 4
Question
4. How to discriminate the interference fit clearance fit and transition fit? 17. A fit with the nominal size 025 is required to have the maximum clearance +0.013mm and the maximum interference-0.021 mm, please design the fit and draw the fitted tolerance graph. 15. What are plain limit gauges? How many types do plain limit gauges have and what are their designed shapes, sizes and tolerances? 16.Draw the tolerance zone of the following fit and calculate the limit clearance or interference. 020 26Explanation / Answer
14. Interference fit
In this case, no matter whatever may be the tolerance level in shaft and the hole,
there is always a overlapping of the matting parts. This is known as interference
fit. Interference fit is a form of a tight fit.
Clearance Fit
In this type of fit, the shaft of largest possible diameter can also be fitted easily
even in the hole of smallest possible diameter.
Transition Fit
In this case, there will be a clearance between the minimum dimension of the
shaft and the minimum dimension of the hole. If we look at the figure carefully,
then it is observed that if the shaft dimension is maximum and the hole
dimension is minimum then an overlap will result and this creates a certain
amount of tightness in the fitting of the shaft inside the hole. Hence, transition fit
may have either clearance or overlap in the fit.
15. This standard specifies the tolerances and limits for simple forms of limit gauges, such as cylindrical plain plug, ring and gap gauges and is intended for reference by component producers and gauge makers when gauge limits have not been stipulated. It specifies gauge tolerances for work piece tolerances in ranges between 0.009mm and 3.200mm and how gauge limits are related to the work piece limits. It also specifies types of gauge according to size and minimum work piece tolerance, dimensions are expressed in millimetres .
the eight main types of limit gauges. The types are: 1. Plug Gauge 2. Pin Gauge 3. Snap Gauge 4. Ring Gauge 5. Calliper Gauge 6. Thickness or Feeler Gauge 7. Radius or Fillet Gauge 8. Screw Pitch Gauge.
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