Datum Feature Simulator of Complex Shape
Datum Feature Simulator of Complex Shape
(OP)
Made the graphics a 2d part for simplicity.
I would like a better understanding of the what the datum feature simulator would be for the comlex boundary shape.
Please see attached image.
Is this complex boundary a valid datum feature A which can be used to consistent define datum feature simulator?
Which surfaces of feature A would be use to make this datum simulator for the purposes of validating location of holes with respect to A.
I would like a better understanding of the what the datum feature simulator would be for the comlex boundary shape.
Please see attached image.
Is this complex boundary a valid datum feature A which can be used to consistent define datum feature simulator?
Which surfaces of feature A would be use to make this datum simulator for the purposes of validating location of holes with respect to A.





RE: Datum Feature Simulator of Complex Shape
RE: Datum Feature Simulator of Complex Shape
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Datum Feature Simulator of Complex Shape
Han primo incensus
RE: Datum Feature Simulator of Complex Shape
The part itself is very thin < 0.032 so I did not want to hold any 3d tolerances due inspection difficulty and no value added to function.
Initially I was thinking of using the pattern of holes as datum A and hold the line profile of the outer boundary to it. But asme gdt spec has ambiguous definition of how datum would be established with pattern of holes. Due to flimsiness of piece, I doubt an inspection fixture would be practical way to inspect it.
I gave it some more thought, perhaps making the overall width datum A and overall length datum B might make sense. Just to establish something to relate the pattern of hole to bounding outline.
RE: Datum Feature Simulator of Complex Shape
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com