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Things to Consider When Purchasing Precision Castings
2016-04-08

As a matter of fact, to get the best value from the metal Precision Casting also requires a cooperative effort on the part of the customer and the supplier foundry from the early stages of the design through to the end manufacturing process. Good planning ahead of time will pay dividends for both you (the customer) and your supplier foundry.

The purpose of requesting a quotation for a steel casting is basically to determine the lowest purchased casting cost. The customer then must weigh all of the provisions of the quotation including exceptions taken to drawings, specifications, and processing requirements, as well as supplier foundry experience, tooling requirements, tolerances, finish allowances, and delivery. Such factors as reduced machine work, better tolerances, improved delivery schedules and reliability are particularly important to determine the lowest end cost of the casting.

However, in order to avoid misunderstandings, reduce costs, and expedite the processing of quotations, you should firstly figure out the following questions in your self.

1. Design - What is the part?

2. Quantity - What is the anticipated or required volume, both present and future?

3. Material and inspection requirements. What should the part be made of, and how should the part be tested before delivery? Usually, some nationally recognized specifications should be used whenever possible to identify the material and inspection requirements.

4. Actual or estimated casting weight. Actual weight information is preferred. Estimates can be provided by the supplier foundry in the absence of actual weight information, but this may require offering prices that are subject to changes based on the actual weight of the casting in question at the time of production.

5. Drawing. Machine drawings are preferred over casting drawings. Drawings or sketches are mandatory if samples or patterns are not available. Drawing should include dimensional tolerances, indications of critical areas and surfaces to be machined.

5. Pattern. If patterns and core boxes are available, the request for a quotation should indicate the type, condition and set up of the equipment.

6. Production and delivery schedules required. Present and anticipated need should be included in quotation requests.

Beyond these basics, there are levels of customer requirements that could include supplier foundry liabilities, which affect the casting cost drastically. These could include receiving inspection acceptance and back charge policy, casting return policy, expediting procedures, and sophisticated controls not normally associated with the standard inquiry. A complete understanding of these areas is best developed by an open relationship between the customer and the supplier foundry representative, and the professional attitudes and experiences that both can provide during the quotation evaluation phase.