What should be paid attention to when purchasing CNC machining parts?

I. Design drawing communication:
Each part, size, geometrical properties, etc. are clearly and clearly marked on the drawing. Use standardized symbols and markings to ensure comprehension by all participants. Indicate on the drawing the required material type and possible surface treatments such as plating, coating, etc. for each part. If the design involves the assembly of multiple parts, ensure that the assembly relationship and connections between the various parts are clearly represented in the drawing.

II. Total price details:
After receiving the quotation from the processing factory, many customers may feel that the price is okay and sign the contract to make payment. In fact, this price is only a single item price for machining in many cases. Therefore, it is necessary to determine whether the price includes tax and freight. Whether the equipment parts need to be charged for assembly and so on.

III. Delivery period:
Delivery is a very critical link. When the processing party and you have confirmed the delivery date, you should not be credulous. There are many uncontrollable factors in the process of parts processing; such as power failure, environmental protection department review, machine failure, parts scrapped and redone , rush order jumping in line, etc. may cause delays in your product delivery and affect the progress of engineering or experiments. Therefore, how to ensure the progress of the processing is very important in the process of processing. The factory boss replies to you "already doing it", "it's almost done", "is doing surface treatment" in fact, it is often unreliable. To ensure the visualization of processing progress, you can refer to the "Parts Processing Progress Visualization System" developed by Sujia.com. Customers of Sujia do not need to call to inquire about the processing progress at all, and they can know it at a glance when they turn on their mobile phones.

IV. Quality assurance:
After the CNC parts are completed, the usual process is to inspect each part to ensure that the processing quality of each part meets the standards of the drawing design. However, in order to save time, many factories generally adopt sampling inspection. If there is no obvious problem in the sampling, all the products will be packaged and sent away. Products that are fully inspected will miss some defective or unqualified products, so rework or even redo will seriously delay the progress of the project. Then for those high-precision, high-precision, high-demand special parts, the manufacturer must be required to conduct a full inspection, one by one, and deal with problems immediately when found.

V. After-sale guarantee:
When the goods are bumped during transportation, resulting in defects or scratches on the appearance of parts, or substandard products caused by parts processing, the division of responsibilities and handling plans must be clarified. Such as return freight, delivery time, compensation standards and so on.

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