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The Three Types Of Fit
Bryan Rosenberger April 15, 2020The Three Types Of Fit
It is common in manufacturing to produce parts that must integrate with one another to serve a common purpose or perform one or more operations. How these items interact is extremely important, and will affect the overall functionality of an assembly. The relationship between two mating components is known as “fit”, and pertains to how tight or loose the items should be when joined together. There are three types of fit commonly referenced in manufacturing and mechanical engineering.
Clearance Fit
Clearance fits allow for loose mating, where free movement is important and a certain amount of play is desired. We see clearance fits called for where elements should be able to slide in and out without obstruction, and where alignment can be loosely guided but does not require tight precision. Examples of clearance fit might include bolt/shaft holes where an element will slide freely through another feature.
Interference Fit
An interference fit will be much tighter than a clearance fit. Also referred to as a press fit or friction fit, the interference fit requires some degree of force to join two components. Pressing a bushing, bearing, dowel pin or other items into their mating components are all examples of how an interference fit can be used. Once joined, this creates a relatively solid union that would require substantial force or potential machine operations to uncouple.
Transition Fit
A transition fit would fall between a clearance and interference fit. Transition fits are called for when accurate alignment is critical, and mating parts must join with greater precision. You may also see these referred to as a slip or push fit. There will still be a greater degree of clearance than a press/interference fit, but it will be substantially smaller and should remove excess play or movement in the joint.
Definition
Interference of waves occurs when two or more waves overlap at a given point.
Type of Interference
The interference of light waves can be divided into the following two categories.
- Constructive Interference: In case of Constructive interference the crest of one wave falls on the crest of another wave in such a way that the amplitude becomes maximum. These waves are in phase with each other and have the same displacement too.
- Destructive Interference: In case of destructive interference, the crest of one wave falls on the trough of another wave in such a way that the amplitude becomes minimum. These waves are out of phase with each other and have different displacements.
Figure : Constructive and Destructive Interference
We know that the superposition of two mechanical waves can be constructive or destructive. As i explained in case of constructive interference, the amplitude of the resultant wave at a given time or position is greater than that of either individual wave whereas in case of destructive interference, the resultant amplitude at a given time or position is less than that of either individual wave.
Conditions of Interference
Sustained interference pattern simply means the position of maximum and minimum intensity regions remains constant with time. To obtain sustained interference, the following conditions are required:
- The sources must be coherent in nature.
- The two light sources must emit continuous waves of the same wavelength and have the same period.
- The distance between the two sources of light should be small to obtain fringes separated by a certain distance so that we can distinguish them.
- The sources should be monochromatic [means single wavelength].
- The two light sources must emit waves in nearly the same direction.
- The light source should be a point source.
- The distance between the two sources and the screen must be large. This condition is again important to obtain visible distinguishable fringes.
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- What do you mean by Coherence?
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- Discussion of Diffraction and its types?
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- Discuss Laser and its properties?