Calculating length of a wire product

[Bertil Rogmark]

Take a U-shaped wire, bent from 10 mm O.D. stainless steel.
You model it as a swept extrusion or a pipe (solid) and when finished,
you calculate the required length to cut from your stock material, either
by doing the geometry math yourself or by creating an evalute feature.
Either way you end up with the same answer, 3 straight lengths and 2 quarter
circles.

If you model the same part but now as a square (10x10 mm) section and then
declare it as
a sheetmetal part you can get the required length by using a flat pattern
feature.
When a sheet metal part is bent, it stretches and therefore, which ProE
recognizes, the total
length required is less than the "geometrical answer" above.
Its obvious that in reality, the wire stretches when bent just like a strip
of sheeet metal and that
therefore the second smaller answer is correct.

Now, does anybody know a way of getting a "flat pattern" answer without
having to redo the part
in square form. This redo can get complicated if there are more bends to the
wire that are not all in the same
plane.

Bertil

[Janes]

"Bertil Rogmark" <ber...@rogmark.com> wrote in message news:cxJUm.13556$U5.2...@newsb.telia.net...

I would say that you use the K factor as do the sheetmetal guys, for example

http://www.sheetmetalguy.com/bend-allowance.htm  While Pro/e does it automatically based on bend tables and K factors built into material properties, there's no reason you can't do the same with hand calcs. You just have to find out what the K factor is for the particular metal that you are bending. This may also be of some help: http://en.wikipedia.org/wiki/K-factor_(sheet_metal) As this makes clear, bend tables adjust for other factors, such as stock thickness and bend radius. Most are discovered and verified in practice.

 

David Janes

 

[Bertil Rogmark]

Thank you for your help David,

I have done a lot of work with sheet metal bending, long before computer software gave us a solution straight from the modeled part.

I was hoping to be able to use the sheet metal functionality on wire products but I guess I have to go back to do the calculating myself.

By the way, do you know a ProE forum where lunatics like this guy Joe788 are not allowed to go on like he is doing here?

 

Bertil

"Janes" <dja...@cox.net> skrev i meddelandet news:Q6%Um.43602$cX4....@newsfe10.iad...

[David Geesaman]

I just killfiled him. No more stupidity.

Dave

Bertil Rogmark wrote:
> Thank you for your help David,
> I have done a lot of work with sheet metal bending, long before computer
> software gave us a solution straight from the modeled part.
> I was hoping to be able to use the sheet metal functionality on wire
> products but I guess I have to go back to do the calculating myself.
> By the way, do you know a ProE forum where lunatics like this guy Joe788
> are not allowed to go on like he is doing here?
>
> Bertil
>

> "Janes" <dja...@cox.net <mailto:dja...@cox.net>> skrev i meddelandet

> news:Q6%Um.43602$cX4....@newsfe10.iad...
>
> "Bertil Rogmark" <ber...@rogmark.com

> <mailto:ber...@rogmark.com>> wrote in message

[Lehnsherr]

On Dec 13, 2:41 pm, David Geesaman <dgeesamanNOS...@yahooooo.com>
wrote:

> I just killfiled him.  No more stupidity.
>
> Dave
>

How does one "killfile" a poster (I assume this results in you not
being forwarded anything by them any more?) ?
I am poking around the google group site here and not seeing a switch
that looks like that...

So tired of sifting through all this yelling John Banquer chaff to get
the good bits of advice out

Thx

Magnus

[David Geesaman]

Killfile is a generic term meaning use whatever filter your newsreader
has to delete the garbage posts. JB is very easy because he posts under
the same user name (newsreader softwares still aren't sharp enough to
filter based on the stupidity of the content)

I'm using Mozilla Thunderbird and it's pretty easy to set up a Filter to
delete particular messages. I poked around google groups and found no
such features. However, I did flag all of JB's threads as spam, so if
others do the same maybe we can collectively vote the threads into
oblivion or something. :)

David