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Using sketches, describe the difference between a clearance fit and an interference fit in a shaft and hole assembly - Leaving Cert Engineering - Question 7 - 2014
Question 7
Using sketches, describe the difference between a clearance fit and an interference fit in a shaft and hole assembly. A hole is produced in a brass plate to the dim... show full transcript
Worked Solution & Example Answer:Using sketches, describe the difference between a clearance fit and an interference fit in a shaft and hole assembly - Leaving Cert Engineering - Question 7 - 2014
Step 1
Using sketches, describe the difference between a clearance fit and an interference fit in a shaft and hole assembly.
Answer
Clearance Fit
A clearance fit occurs when the diameter of the shaft is smaller than the hole size. In this fit, there is always a gap between the two components, which allows for relative movement. The shaft can easily rotate inside the hole without any obstruction.
Sketch:
Clearance between Hole and Shaft assembly
--------------------------
| Hole |
| |
| ----- |
| | | |
| | Shaft| |
| ----- |
--------------------------
Interference Fit
An interference fit, on the other hand, occurs when the shaft's diameter is larger than the hole’s diameter. This results in no space between the two components, creating tight contact. The shaft cannot be inserted into the hole without force, leading to a strong mechanical connection.
Sketch:
Interference between Hole and Shaft assembly
--------------------------
| Hole |
| |
| ----- |
| | | |
| [| Shaft| |
| ----- |
--------------------------
Step 2
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Step 6
Name any three of the instruments shown and give one application of each instrument named.
Answer
- Feeler gauge - Used for checking the size of required gaps, such as in spark plugs.
- Surface plate - Employed for accurate marking using a vernier height gauge.
- Adjustable bevel - Utilized for checking angles when bending metal sheet.