What to Look For When Choosing a Casting Supplier
What to Look For When Choosing a Casting Supplier
The process of choosing the right metal casting supplier should not be the same as choosing your supplier for bolts, manufacturing equipment, or office supplies. While some may treat metal castings as a commodity, they are far from it and the process of selecting the right supplier for a specific application requires careful consideration.
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Supplier qualification is the most important part of the purchasing process. Traditionally, a purchaser&#;s primary responsibility was to find qualified and responsive suppliers. In some cases, purchasers assumed that any supplier willing to contractually meet the purchase requirement was qualified. However, using low cost and unqualified suppliers can cause quality issues, and wasted time and money in the long run.
To help you through the process, here are some things to consider when choosing the right metal casting supplier.
Experience in Your Market
When selecting the right foundry to work with, determine if they have experience in your market. A metal supplier that truly understands your products, applications, terminology, and pain points can anticipate needs and potential problems. This is especially important in defense, nuclear, aerospace or other high compliance markets. The good news is that most casting manufacturers will publish their key markets on their websites, making it easy to determine when considering a supplier.
Process Diversity
Companies try to sell you what they have to offer and some casting suppliers only offer one type of casting process. For example, a company that only uses the investment casting process will try to sell you on why that process is best for your application. But what if using the sand casting process is best for you and your needs? Instead, look for a supplier that offers a range of casting processes so the best option for YOU is selected.
If your components have a range of designs, applications, and sizes, it is likely that the best casting process is not the same for every part. If working with a single source for all of your casting needs is important to you, the supplier needs to be diverse in its capabilities. When combined with other integrated capabilities, this can help simplify and compress the supply base.
Product Quality, Service, and Price
When selecting the right casting supplier, careful consideration should be given to quality, service, and price. Take an internal audit on what really is important to you, noting that most companies may be acceptable in all areas but can probably only truly excel in one. If the lowest price possible is most important, for example, the supplier will likely not be world class in quality and service. Which are your &#;Must haves&#;? Lowest price? Meet the spec? Quick response? Easy to do business with?
Certifications and Testing
Does your application require that the casting supplier have proper certifications such as ASME, Nadcap, or PED? If so, confirm that your potential supplier has the proper certs. Granted, a supplier could go through the process to obtain the required certifications but more than likely, time does not allow for that. Most casting suppliers will list their certifications on their website, and companies are searchable by certification. Be diligent.
Do you require non-destructive testing (NDT), mechanical testing, or chemical testing? While all metal casting suppliers can outsource any needed testing, some have all those capabilities in-house which can potentially save time and money. If your application does not require any testing, a casting supplier specializing in high compliance work with in-house capabilities may not be the right fit either.
Machining Capabilities
Buyers increasingly select casting suppliers who have machining capabilities. This can avoid conflict if defects are discovered during machining. If a third party is machining, it may result in &#;finger-pointing&#; about who is at fault. Is it a casting issue or a machining issue? If the casting supplier discovers an issue during machining, the problem is resolved faster with no dispute over whose fault it is. The foundry &#;owns it&#; and there is less time needed for processing, shipping, and handling or replacing. Problem or no, integrated machining simplifies the supply chain and reduces handling time and shipping cost before the product makes it to the customer.
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Choosing The Right Supplier
Value Added Services
What do you need from your casting supplier? Are you looking for someone to just deliver a metal component to your doorstep or do you need more? For example, if you do not have in-house metallurgy expertise, confirm that the supplier can provide guidance in selecting the proper alloy based on your specific application. Do you have a need to raise the expertise of the overall metal in your company through training or information sharing?
Do you want a supplier who can review your design and material selection and provide recommendations to make your products last longer or save money? Some suppliers may do a great job producing a product to spec but have few other capabilities. Others will exceed the letter of the PO to help you save time and money.
Do you have requirements for both ferrous and non-ferrous alloys? Some foundries are limited or specialized. Make sure the supplier can meet all your material or alloy requirements to eliminate the need for multiple suppliers.
Tour Their Facility
What better way to determine if someone is the right casting supplier than to see their operations firsthand with a plant tour? Most manufacturers are more than happy to have you as a guest in an effort to gain your business. If, by the end of the tour, you have doubts about operations, capability or culture, they are probably not the right supplier for you.
Questions to Ask Yourself
- Does the supplier have experience in your products and/or markets?
- Can the supplier fulfill several of your product requirements to limit the number of needed vendors?
- What is REALLY important to you? Is it quality? Price? Customer service? Something else? How do supplier strengths compare with your needs?
- Does the supplier currently have the certifications you require?
- Does the supplier have the proper testing capabilities?
- Do they regularly deal with the alloys required?
- What value-added services do you need? Does the supplier offer them?
- Is the company stable with a strong history and future?
- What are their values and do they align with yours?
- Do you see your company doing business with them? Can you build a relationship with them?
- What is the supplier&#;s casting products list?
Conclusion
While some may treat metal castings as a commodity, they are far from it, and therefore, the process for selecting the right supplier for your specific application requires careful consideration. Take an internal audit of your company&#;s needs and wants, and determine what is most important. Research the supplier&#;s website. Talk to a sales rep or business associate. Ask a lot of questions. Visit their facility. Get an understanding of what they can do for you and if you can see yourself building a strong, mutual relationship with them.
Casting sand | Canadian Hobby Metal Workers & Machinists
Unless you're interested in reusing the sand for many; MANY castings; I'd recommend ordering some Petrobond and getting your project done. (Though given the shipping costs, unless you have a store nearby that you can pick it up, the cost is pretty high per pound!)
ShawnR said: Click to expand...
Greensand is.. fickle. The exact blend makes a significant difference to the end casting quality, and unless you have a LOT of patience or want to buy/build a sand muller: it's also a lot of work to prep each time you want to use it.
If you do want to go down the road; I'd recommend Casting for the Home Workshop by Henry Tindell and Dave Cooper (
Regardless; like
ShawnR said: Click to expand...
MOST Firebrick is primarily composed of aluminum silicates. These tend (in my understanding!) to break down and round under mulling and thus get finer and finer (and unfortunately smoother!) with each reuse. It's also going to be inconsistently sized (at first) and thus will lead to random surface defects.
For a single use, it'll probably work ok. The more it get's reused; the more venting the sand is going to need to off-gas: the finer the sand gets the more clay is going to be needed and thus the less inter-grain-spacing will be available for the cooling metal to off-gas into.
I wouldn't use it (for long term use) but I don't personally know of any reason it wouldn't work (hypothetically) for one-off usage.
ShawnR said: Click to expand...Generally I use simple big-box-store SPF wood 1x6's or 2x6's with box-jointed corners: depending on the required volume (and thus the total weight).
Wooden flasks are easy to build but ARE consumable; spills and thin-sand areas will eventually lead to the flask catching fire. As the wood shifts over time; it will need to be planed flat at the interface and the alignment will need to be tweaked.
Everything I've cast before is under 6 inches in at least one dimension, so there's more than sufficient space in such a flask.
If I were looking for something a little more "long term" reusable and lower maintenance; various suppliers sell cast-iron flasks. These don't absorb moisture from the sand, stay flat over time, and allow you to cast using much less sand without destroying the flask. (I haven't found a need for such personally!)
Super curious what you're planning to cast!. (Though given the shipping costs, unless you have a store nearby that you can pick it up, the cost is pretty high per pound!)Greensand is.. fickle. The exact blend makes a significant difference to the end casting quality, and unless you have a LOT of patience or want to buy/build a sand muller: it's also a lot of work to prep each time you want to use it.If you do want to go down the road; I'd recommend Amazon link ) it does a good job breaking down what properties and components of each sand type make it useful for various needs.Regardless; like @Tom O and @DaveK mentioned: find a pottery supply store nearby and pick up some bentonite, then any landscaping supply to find mortar sand (You'll also need an air-tight container to store it in when unused). There's lots of guides online to mixing and making greensand; keep in mind that they ALL gloss over the time required. (for 50-100lbs: expect to be mixing for a few hours!)MOST Firebrick is primarily composed of aluminum silicates. These tend (in my understanding!) to break down and round under mulling and thus get finer and finer (and unfortunately smoother!) with each reuse. It's also going to be inconsistently sized (at first) and thus will lead to random surface defects.For a single use, it'll probably work ok. The more it get's reused; the more venting the sand is going to need to off-gas: the finer the sand gets the more clay is going to be needed and thus the less inter-grain-spacing will be available for the cooling metal to off-gas into.I wouldn't use it (for long term use) but I don't personally know of any reason it wouldn't work (hypothetically) for one-off usage.Generally I use simple big-box-store SPF wood 1x6's or 2x6's with box-jointed corners: depending on the required volume (and thus the total weight).Wooden flasks are easy to build but ARE consumable; spills and thin-sand areas will eventually lead to the flask catching fire. As the wood shifts over time; it will need to be planed flat at the interface and the alignment will need to be tweaked.Everything I've cast before is under 6 inches in at least one dimension, so there's more than sufficient space in such a flask.If I were looking for something a little more "long term" reusable and lower maintenance; various suppliers sell cast-iron flasks. These don't absorb moisture from the sand, stay flat over time, and allow you to cast using much less sand without destroying the flask. (I haven't found a need for such personally!)
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