Inspection of "Stock" dimensions
Inspection of "Stock" dimensions
(OP)
Hi. Can someone know of a specification that instructs inspectors how to properly interrupt a stock dimension? Currently, they are applying the drawings tolerance block leading to rejections and conflicts with our vendors. Thanks.





RE: Inspection of "Stock" dimensions
What you need is a note on your drawings to the effect of "Dimensions and tolerances of standard stock per the controlling standard."
RE: Inspection of "Stock" dimensions
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Inspection of "Stock" dimensions
RE: Inspection of "Stock" dimensions
ASME Y14.5M -1994 1.4(a)states that "Each dimension shall have a tolerance, except for those dimensions specifically identified as reference, maximum, minimum, or stock (commercial stock size)."
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Inspection of "Stock" dimensions
It is customarily the responsibility of the manufacturer to provide all of the documentation necessary to inspect a part. This would include the controlling standard in this case.
Well, you could place a reference to the note adjacent to each dimension where it applies. Or you could further expand the wording of the note to make it apply to "stock material dimensions used 'as-received' without modification."
RE: Inspection of "Stock" dimensions
RE: Inspection of "Stock" dimensions
RE: Inspection of "Stock" dimensions
You/He might even want to put a cheat sheet together for the common stock materials you see.
At the very least if he's not willing to take initiative then tell him that when there is a stock dimension he should ask for the relevant specification or similar - not use block tols.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Inspection of "Stock" dimensions
RE: Inspection of "Stock" dimensions
RE: Inspection of "Stock" dimensions
It should be the Engineering Planner or Manufacturing engineer that should be specifying stock tolerances.
if it's sheet metal, machine shop or other. written instructions or a sketch specifying diameter, length or width.
stock material is spec by the raw stock suppliers. it's up to the manufacturing engineer to specify it's size.
the engineering drawing only specifies the material specification, if it's a forging, wrought or whatever.
some engineers do draw it if it's a casting,or a forging,
My 2 cents
Mfgenggear
RE: Inspection of "Stock" dimensions
The flatness of the part should be called out on the drawing and then it is up to the manufacturing engineer to produce a part to this tolerance. As a manufacturing engineer I need to know what you want and not rely on any stock note.
Decoiled material has a nasty habit of having coil memory and when a part is plasma cut or laser cut or oxy-fuel cut out of the end of the coil the part will end up looking like a banana because of coil memory.
Bill
RE: Inspection of "Stock" dimensions
I am with you. I probably need to clarify!
I was specifying raw material stock & not finished product.
It up to the manufacturing engineer to specify what size raw stock material & what tolerance it will be.
as long as it is to the material specification of the drawing.IE AMS 6265, AMS 6415 etc.
He has to be cost effective, yet allow for any post process machining, fabrication or whatever.
The manufacture at his or her discretion can omit certain attributes & combined them at a later fabrication or assembly.
"nature of the animal". as long as the final product meets drawing requirements.
The engineering print drawing must call out all finished blueprint requirements.
the final part or assembly must be to the final drawing.
If the Design Engineer wants to specify the tolerance the print. he can as long as it part of the list bill of material.
which can aid fabrication. & He or she is correct.
HTH
Mfgenggear