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Electronics Forum / CAD / April 2008Drawing questions
I see these frequently on PCB figures (REF BSC TYP). Could someone kindly explain what these mean? REF = reference (to what)? I pretty sure that BSC is basic spacing between centers? TYP = ? Also, in datasheet packaging sections, there is often a thin horizontal rectangle subdivided into (usually) 3 or 4 sections. Each rectangle usually starts w/ a symbol (for example, 1/2 circle or theta)in the first section, followed by sections w/ alphas or numberics - oftentimes accompanied by a letter in a circle. Could someone explain this or point me to an explanation as well? Thanks, Tom Blip, BSC: Basic Dimension. Theoretically exact value shown without tolerances. REF: Reference Dimension, usually without tolerance, for information purposes only. TYP: "typical" dimension. The details you seek are all dimensioning standards encompassed in ANSI Y14.5M, search the internet for it and you will find your answers. However I am not sure you will find an online source, a quick search I did only turned up books for sale, no online versions. The rectangular boxes with symbols and figures is part of the ANSI standard dimensioning where the figures indicate the type of measure/tolerance (center point, perpendicular, surface flatness, parallelism, etc., etc.), the letter usually indicates a datum to which the measure/tolerance pertains and the numerics are typically the actual measure and/or tolerance.  SignatureSincerely, Brad Velander. >I see these frequently on PCB figures (REF BSC TYP). Could someone > kindly explain what these mean? REF = reference (to what)? I pretty [quoted text clipped - 8 lines] > > Thanks, Tom >Blip, > [quoted text clipped - 7 lines] > > The rectangular boxes with symbols and figures is part of the ANSI standard dimensioning where the figures indicate the type of measure/tolerance (center point, perpendicular, surface flatness, parallelism, etc., etc.), the letter usually indicates a datum to which the measure/tolerance pertains and the numerics are typically the actual measure and/or tolerance. Thanks for the help... |
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