Dimensioning Organic Forms?
Dimensioning Organic Forms?
(OP)
I have a product family that I need to create a set of QC drawings for using GD&T. Does anyone know of or have an example of a drawing for a product built entirely by lofting 3D splines. Due to the molded fit of the product this was the only method possible to give the surface control and continuity required for proper function of the product and proper fit to the anatomy.
I really just need to see a similar layout to get a starting point.
Thanks,
MJ
I really just need to see a similar layout to get a starting point.
Thanks,
MJ





RE: Dimensioning Organic Forms?
http://www.hexagon.de/wn5_e.htm
There are references to ISO and ANSI standards where the specification criteria is explained further.
Paul
RE: Dimensioning Organic Forms?
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: Dimensioning Organic Forms?
We did the same with reactor, impeller, and turbine blade contours in automotive torque converters.
Paul
RE: Dimensioning Organic Forms?
Yes they are basically Nurbs, but I would not consider what Pro or Solidworks can do Nurbs. I researve that for Alias.
Basically how would someone take a 3d scan of a human ear and then dimension it so that "someone who has never sean an ear can understand it". More than just a basic table for a spline gear. I have already provided the basics, as well as 3d part files, items are being produced and the automated QC inspections are fine, but client wants complete GD&T documentation as he wants to manually check the tolerences of every part once a week.
RE: Dimensioning Organic Forms?
Paul
RE: Dimensioning Organic Forms?
Thank you, this is what I have been trying to convey to the client. However dispite is age he is very oldschool in thinking.
RE: Dimensioning Organic Forms?
ASME Y14.14 is the standard you want to take a look at for digital data product definition but it probably wont give all your answers.
Here's a sample of notes I've used for similar items.
1. DIGITAL PRODUCT DEFINITION PREPARED IN ACCORDANCE WITH ASME Y 14.41-2003.
2. THIS DRAWING SHALL BE USED WITH MODEL (INSERT PART NUMBER) (REVISION PER THIS DRAWING) FOR COMPLETE PRODUCT DEFINITION. MODEL GEOMETRY IS BASIC.
I then have default surface profile as required.
KENAT,
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RE: Dimensioning Organic Forms?
Why would anyone want to try and cut a whole load of sections and then try to dimension things that cannot be dimensioned when the only way to measure the part is on a CMM against a model?
RE: Dimensioning Organic Forms?
I will say this, unless you are in a suitably integrated supply chain where you can all share CAD Data without translation issues or losing control of the version etc. I'd suggest a hybrid drawing/model approach not pure MBD. You have a simplified drawing, essentially to accomodate notes and put any annotation that's required such as identifiying datums or different tolerances for individual features etc, some reference overall dims can be usefull too.
However, this has been discussed at length elsewhere.
KENAT,
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RE: Dimensioning Organic Forms?
Luckily the entire system is digital using Solid Works native files with .step backup files. The only analog aspect is a micromanaging client, but that can be mitigated fairly easily with the right input and direction.
Thanks
MJ
RE: Dimensioning Organic Forms?
The last I'd heard Solid Works couldn't really do full MBD but maybe that's changed.
KENAT,
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