Drafting - dimensioning splines/curves

What is the recommended practice for detailing a spline or any sort of
'freeform' curve or xsec?

Currently I suggest to my students simply dimensioning controlling points
along the curve - the number of points dependent on the detail required.

Cheers, Sean


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sean Kerslake
Dept. Design & Technology
Loughborough University
Loughborough
LE11 1RN

01509 228317

 

With that sort of data we tend to say 'cad is master' - which is to say, the
geometry of the part is defined in the cad file. What you're doing is fair
enough to define a bunch of checking dimensions, but dosn't fully describe
the geometry of the feature.

 

So are you suggesting John that you would not detail the geometry but would
simply refer a third party to the CAD file?

Sean
--


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sean Kerslake
Dept. Design & Technology
Loughborough University
Loughborough
LE11 1RN

01509 228317

 

I have a standard note that states that it is a reference drawing, with only
tolerances and other information on it, and refer to the accompanying 3d cad
file. since i have standard way of identifying it, with the same revision
for both drawing and iges etc file, i can refer to what the file will be
called, with the revision, using paramaters. I turn this note into a symbol
so it , and several versions of it can be added easily to a drawing
cheers
Craig

 

ASME Y14.41 defines a Minimum Content Drawing (MMC) which calls out the
model as the control document. It's basically an extension of Y14.5 in
regards to 3D data.

Anyone out there using this standard yet? I have yet to get a copy.