yang686526

inspection symbols
i am new to this forum so please excuse any etiquette errors. i have just taken a position as the qc manager in a small job shop in northern vermont. the print that i am working on calls for the part in question to be marked in ink with both the part number (no big deal) and the inspection symbol. i have no idea what they are looking for or what they mean by inspection symbol.
the print in question is dated 1956 so i am assuming that they are not talking about gd&t symbols. the only thing that i can think is that they may need us to mark the inspection methods used like mpi (magnetic particle inspection) or fpi (fluorescent penetrant inspection).
any information would be greatly appreciated. thanks in advance -
russ
preci manufacturing inc.
could it mean the inspectors stamp to verify that it was inspected and who inspected it?
each dimension on the print is noted with a number so that once the part is completely measured, one can reference the dimension and reference number. all jobbing shops conform to this practice.
i am going to assume that you are not just producing one or two parts but once samples are approved, there will be some sort of production run.
the inspection symbols would relate to ongoing inspection noted on a "control plan" in automotive supply companies or "inspection plan" in non-automotive.
i would check other drawings and figure out the meanings of the symbols. one might mean that the feature (characteristic) is confirmed with an attribute gauge (positional at mmc as an example) while other symbols might a variable checking gauge. another symbol might reflect that spc is to be used.
now find out the fit and function of the part. from that determine if the process on the functional characteristics is rather loose or well controlled through manufacturing. now you can mark the drawing up reflecting the features (characteristics) that would require ongoing confirmation.
this information will be noted on a control plan with the sample size, frequency, specification, gauge used and what to do if the feature is non-conforming.
hope this helps.
dave d.
i would ask for clarification, but i think they are referring to your qc stamp. normally if you have more than 1 inspector, each will be given a unique stamp that can be traced back to a particular inspector. at my current company this is an oval with a number. at a previous company, they used shapes, like stars, circles, hexagons, etc.
"art without engineering is dreaming; engineering without art is calculating."