On Feb 6, 6:34 pm, "Janes" <dja...@[EMAIL PROTECTED]
> wrote:
> "mdR" <mr...@[EMAIL PROTECTED]
> wrote in message
>
>
news:420cabf1-d1c6-4cd7-bd62-e59b9b11aae7@[EMAIL PROTECTED]
>
On Jan 24, 4:30 pm, graminator <graha...@[EMAIL PROTECTED]
> wrote:
> >> When you have an assembly and you need to keep a relation****p between
> >> parts (say for example you have a molded enclosure with screw bosses)
> >> how do you keep your parts parametric? Do you:
>
> <snip>
>
> Thanks for your description of some sophisticated, top down design
methods.
> But, to echo Graham's concern, how do these methods preserve
relation****ps
> to the parts they are based on?
>
> > we use some inheritance--works good with castings.
>
> This was the one, judging by the name and reputation, that I thought had
the
> best chance of preserving a relation to the parent part. But, I haven't
used
> it and I'm not sure why its use seems to be so confined to molds and
> castings. Any insights as to why it isn't more widely used!?!
>
> David Janes
~hey David
By having all the models and sub-assemblies tied to top down, when you
open any level assembly, regen will propagate any changes down to
children. Preferably you should always open the top most assembly,
even if you simply close the window. This insures you haven't missed
a branch when it regens.
I think inheritance definitely has it's place, but I would say it's a
heavy weight usage component. It carries all the features and
definition of it's owner, where most of the time (at least what I've
done) you may only need a couple of surfaces to help define the new
component. In some weldments and finish machining instances
inheritance is absolutely beautiful! In other instances it would be
virtually impossible (may read: ridiculous) to use.
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