If you’ve looked into machining parts, then you’ve undoubtedly heard the terms billet and casting. You may be wondering what these terms refer to and what the difference is.
Billet
Let’s first take a look at billet. The term billet doesn’t have to do with the type of metal that a part is made from. Instead, it has to do with the process of how the part is made.
A billet is a solid piece of metal. So when a part is made from a billet, it means it was cut out of a solid block. The good news is, a billet tends to be stronger. This is for two main reasons:
Reason one: The types of materials used in casting are the ones that tend to be a bit softer.
Reason two: Even if you were to use the same metal in a cast as you did to create a part from a billet, the billet would inevitably be stronger. That’s because the process of casting requires heating and cooling multiple times, which can affect the property of the metal. When you create parts with a billet, they have a smoother finish. Casting tends to be rougher. However, if a better finish is necessary, the parts can be painted or machined.
Another benefit of billets is that are cut using CNC machining which is incredibly accurate. The downside to using billet is that it really doesn’t drop in price when you run a larger quantity of parts, because each piece is run individually. With casting, you may be able to reduce the price with a larger run, since you can make copies of the mold.
Casting
Casting is the process where a mold is created in order to make the part. So the mold is made first, and then a hot material is poured into it. Once the liquid material turns solid, the mold is removed.
One of the benefits of casting is that it can be used to make unusual shapes since you’re using a mold to create the piece. There really aren’t any sizing requirements for casting, as you can make large or small parts. The other benefit, as mentioned above, is that it may be more cost-effective when it comes to running a large order.
Is casting or a billet better? That all depends. There are a number of things that can affect your decision, including your budget and the size of the parts. The final quality and required tolerances might also affect your decision.
We would love to discuss your project and talk about the options available. Give us a call today at (307)-672-9220.