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Reference for buyers sending a drawing to a Chinese machine shop for the first time.
Choosing between turning, cold forging and stamping
Geometry and quantity decide the process, and quoting a part on the wrong one can double its price.
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DIN and ISO standard parts, and when a special is cheaper
A standard part is cheaper until the standard does not fit, at which point a special is cheaper than an assembly designed around a compromise.
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Material and surface treatment selection
A grade that machines more easily may corrode sooner, and that trade-off belongs to the buyer rather than the supplier.
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What a drawing needs to carry for a firm quote
Material grade, quantity, critical features, finish and any standard reference, plus a sample where one exists.
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Have a drawing ready
Send the drawing with the material, the quantity and the finish you need. You will get a price, a process and a lead time, and a free sample before volume production.