The principle of electromagnet factory processing

After electromagnet manufacturers purchase products, trusted a lot cost are concerned, because I choose manufacturer owe good, incur procurement to the product of the existing quality problems, processed products of natural also not an exception, with is we came all the way here to inquire about the electromagnetic iron core processing became so check the interested?
The brief main point is to the product of manufacturer of electromagnetic iron core processing at the trial, usually environment, large amount of machine kind of product processing is necessary to take the supply drawings about pattern, and generate the processing factory will completely according to the cost of supply drawings generated held about pattern processing, indeed as expected is try to hold the generated, in the generated after the produce, the cost to hold checking, check whether the product of the generated accord with my request, if do not accord with the request, can request the other processed separately, perhaps simply stop the treaty.