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Q: Define shrinkage and porosity How can you tell whether cavities in a casting are due to porosity or to shrinkage?
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How can you tell whether cavities in a casting are due to porosity or to shrinkage?

Porosity is a defect, which results from air entrapment in the molten metal due to turbulent flow causing air bubbles. Usually, this defect is characterized by smooth and spherical pores, but if rough and angular it is most likely as a result of shrinkage dendrites. The mechanical properties associated with shrinkage is the thermal expansion of the molten metal when it solidifies and cools to room temperature, if the riser isn't properly designed to accommodate shrinkage, there would be dimensional changes and are usually in form of cracks.


How does porosity affect infiltration?

Porosity affects infiltration because it determines the speed of the infiltration whether it will be fast or not


The mold design control  ?

First of all, we should fully understand the technical requirements of users in many aspects such as mold structure, material, hardness, and precision, including whether the shrinkage rate of molding plastic material is correct, whether the 3D size of the product is complete, and whether the processing analysis is reasonable.  


Whats the best way to determine whether a motor really is a 383 or just another 350?

check the casting number on the crank


Do authors have a say in who portrays the characters in the movie version of their books?

Authors typically do not have direct control over casting decisions for movie adaptations of their books. Casting decisions are usually made by producers, directors, and casting directors in collaboration with studios and financiers. However, some authors may have input or be consulted during the casting process, depending on their contract or level of involvement in the film production.


What is needed for a wicca circle casting?

Casting the circle separates the witch/ witches from the regular world, it creates our sacred space. Whether it is 'merely' psychological, or something more tangible, it creates 'a place that is not a place, in a time that is not a time, between the worlds and beyond' wherein work can be performed.


What are go-sees?

Go-sees are appointments where models or actors meet with clients, such as photographers, casting directors, or designers, to showcase their look and talent. This allows the client to assess whether the model or actor fits their needs for a particular project. Go-sees are an important part of the casting process in the fashion and entertainment industries.


What does it mean dreaming about casting out demons?

This dream is about combating evil forces, personified as "demons." For example, it is rather difficult to cure a person of selfishness. But if one visualizes a "Demon of Selfishness," then one can act against it. Such visualization removes blame from the selfish person, and places it on the demon. ... The meaning of this specific dream depends on whether the dreamer is casting demons from some other person, or whether the dreamer has a demon that is being cast out by someone else.


What does it mean if dream about casting out demons?

This dream is about combating evil forces, personified as "demons." For example, it is rather difficult to cure a person of selfishness. But if one visualizes a "Demon of Selfishness," then one can act against it. Such visualization removes blame from the selfish person, and places it on the demon. ... The meaning of this specific dream depends on whether the dreamer is casting demons from some other person, or whether the dreamer has a demon that is being cast out by someone else.


What is the literal meaning of ostracize?

It comes from the Greek word ostrakhoi, which means potsherds. Greeks used to vote on whether to banish someone from the city by casting ballots made from broken pots.


How do you determine whether a 400 or 428 CID in 67 Catalina?

The easiest way would be to get the casting code on the engine. It is found next to the distributor. Then go online. There are several sites that can give you the breakdown. Lmfao


What is a TV series pilot?

It's the sample episode made so the network can decide whether to buy it or not. If bought it usually becomes the first episode of the series. Though sometimes it might be reshot if there is a casting change.