Effective Training Inc. Message Board

Sir,
I have doubt that the GD&T what we use on the drawing,Describes the only inspection method involved or also the way the part has to be manufactured
Thanks in advance for the reply.
Naga

Naga,
I would also doubt that GD&T "describes the only inspection method involved or also the way the part has to be manufactured" since GD&T should not define a manufacturing method nor an inspection method. Rather GD&T is supposed to describes part requirements which manufacturing must meet and inspection must validate. There are rules within the ASME and ISO standards that provide consistency and guidance as to what must be measured, but the standards do not dictate the tools for inspection, Contact CMM or scanner, Gage plates and pins or vision system inspection.

It's a faily common mistake for people think that because a drawing uses the position tolerance a contact CMM must be used for inspection, or because profile of a surface was used that a height gage or dial indicators cannot be used for measurment. In fact it all depends upon your part geometry and the capability (sensitivity) you need in your measurements.

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