Change the shape of the raw material FAI

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Jim Wynne

Staff member
Admin
#2
Are you referring to bar stock and the profile changes from round to square? I'm not an AS9100 expert, but I would think that if the customer material specifications and supplier aren't affected, there should be no problem. When in doubt, ask the customer.
 

Jim Wynne

Staff member
Admin
#4
Yes, i'm talking about the shape of ther bar, and yes for these two are the same specification, the only difference is the form
You also have to consider whether the processing is changing due the form of the material. Like I said, if you're not sure, ask the customer.
 

John Predmore

Trusted Information Resource
#5
I remember one case in a company I worked at, where a Asian supplier could not source hex bar stock in a fractional size in inches outside the US. They proposed to machine the hex shaft from round stock, starting with a 20% larger diameter. They submitted a First Article Inspection for machined-from-round that met every dimension on our part drawing. The US-based customer had a lengthy debate on whether to accept the FAI. I should explain, the design drawing called for the shaft to be made from a nominal-size Hex Bar stock, and therefore the final part drawing did not have dimensions for the sides of the hexagon or surface finish callout or a tolerance on the angles (these are defined in industry specifications for hex bar stock). I remember we also debated whether the outer surface of the finished shaft would be too soft in the product application, if the work-hardened drawn surface was removed in machining. As I recall, additional wear and strength testing of the machined-from-round shaft was done and tolerances were added to the shaft drawing, before the part was sourced with the Asian supplier. The moral of the story, a change in process plan can introduce risk, not limited to the dimensions on the part drawing.
 
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