Inventor General Discussion

Inventor General Discussion

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*Holzwarth, W.
Message 1 of 7 (81 Views)

Can driven constraints be applied symmetrically?

81 Views, 6 Replies
11-16-2002 02:05 AM
Hi to all readers of this message,

now that I've installed SP1 for IV6, let me ask my question:

Can driven constraints be applied symmetrically, or in even more cases?

See the assembly file in CF under the same topic. It's part of the retract
gear linkage of an R/C airplane, consisting of two symmetrical
four-bar-linkages. I want to move both sides on the screen, from the working
to the retract position, and so on. I can do this with my cursor, by
gripping the red part on the right, and moving it. The left side is
following in the same manner, if I'm doing that with caution; sometimes it
gets disturbed in the end positions.

But I can't do the same task by use of driven constraints, there's a no-go.
- Go to the adaptive Zyl-D10-H25:1
- Expand Zyl D10-H25-Teil1:1
- Suppress the constraint "Passend" (=Mate)
- Unsuppress the constraint "Driven Stroke"
- Try to use the drive by constraints function for "Driven Stroke"
- No success

Now delete the complete symmetrical mechanism of the left side, and try the
drive by constraints task again. It works.

Is there a workaround for my task, or am I doing something wrong?

Thanks for any hints
Walter

Dipl.-Ing. Walter Holzwarth
Ingenieurbuero fuer Maschinenbau
Brombeerweg 23
D-37281 Wanfried
Tel. +49-5655-92144 Fax +49-5655-92145

http://www.holzwarth-cad.de (Only in German language)
*Holzwarth, W.
Message 2 of 7 (81 Views)

Re: Can driven constraints be applied symmetrically?

11-16-2002 03:54 AM in reply to: *Holzwarth, W.
Hmm,
I just noticed that there are two entries under the above topic in CF. My
original file seems to be deleted, the other one is from Martin Shoemaker.
But the text never has 4129 KB. What to do?
Walter

P.S. I just think to know the cause of the problems. I have two valid mail
adresses. The former, Walter.Holzwarth@t-online.de is the slower one, and as
I remember, limited in file size. The other one wh@holzwarth-cad.de is with
DSL. I'll try a new approach there.
*Keller, Kent
Message 3 of 7 (81 Views)

Re:

11-16-2002 05:02 AM in reply to: *Holzwarth, W.
Sounds like you may need to reset Customer files in your newsreader. I see
two files from you and they appear to be the same.

--
Kent Keller
Member of the Autodesk Discussion Forum Moderator Program

http://www.MyMcad.com/KWiK/Mcad.htm

"W. Holzwarth" wrote in message
news:8E39243941A2D3A5606F43331E6FDD32@in.WebX.maYIadrTaRb...
> Hmm,
> I just noticed that there are two entries under the above topic in CF. My
> original file seems to be deleted, the other one is from Martin Shoemaker.
> But the text never has 4129 KB. What to do?
> Walter
*Howard, Jeff
Message 4 of 7 (81 Views)

Re: Can driven constraints be applied symmetrically?

11-16-2002 05:58 AM in reply to: *Holzwarth, W.
I've just had time to look briefly at your assembly, tried to rework it in a
manner that works for me in similar assemblies and tried to place a simple
adaptive part in the assembly in place of the actuator assembly and drive one
side by driving the strut tube position. Perhaps I'm just not holding my
mouth right, but I can't get it to work as I think it should.

The errors that occasionally are reported related to "access invalid address"
don't inspire a lot confidence that all is working as it should be (adesk
comments on this?).

Sorry, but got to go back to work...

Maybe someone else will be able to offer some help.

Jeff
=====================



"W. Holzwarth" wrote in message
news:4815CB2CF9A53C3BA4CB3DADD21B8B1F@in.WebX.maYIadrTaRb...
Hi to all readers of this message,

now that I've installed SP1 for IV6, let me ask my question:

Can driven constraints be applied symmetrically, or in even more cases?

See the assembly file in CF under the same topic. It's part of the retract
gear linkage of an R/C airplane, consisting of two symmetrical
four-bar-linkages. I want to move both sides on the screen, from the working
to the retract position, and so on. I can do this with my cursor, by
gripping the red part on the right, and moving it. The left side is
following in the same manner, if I'm doing that with caution; sometimes it
gets disturbed in the end positions.

But I can't do the same task by use of driven constraints, there's a no-go.
- Go to the adaptive Zyl-D10-H25:1
- Expand Zyl D10-H25-Teil1:1
- Suppress the constraint "Passend" (=Mate)
- Unsuppress the constraint "Driven Stroke"
- Try to use the drive by constraints function for "Driven Stroke"
- No success

Now delete the complete symmetrical mechanism of the left side, and try the
drive by constraints task again. It works.

Is there a workaround for my task, or am I doing something wrong?

Thanks for any hints
Walter

Dipl.-Ing. Walter Holzwarth
Ingenieurbuero fuer Maschinenbau
Brombeerweg 23
D-37281 Wanfried
Tel. +49-5655-92144 Fax +49-5655-92145

http://www.holzwarth-cad.de (Only in German language)
*Howard, Jeff
Message 5 of 7 (81 Views)

Re: Can driven constraints be applied symmetrically?

11-16-2002 09:21 AM in reply to: *Holzwarth, W.
If it's any help, I did get the assy to articulate by copying the actuator and
making it adaptive as well, then driving both left and right sides via an
assembly work plane. Can post to CF is you'd like.

Jeff
===============
*Brown, Anne
Message 6 of 7 (81 Views)

Re:

11-16-2002 09:38 AM in reply to: *Holzwarth, W.
There were two files as Kent said. One was removed.
--
Anne Brown
Manager, Moderator
Autodesk Product Support Discussion Groups
Discussion Q&A: http://www.autodesk.com/discussion

"W. Holzwarth" wrote:
>
> Hmm,
> I just noticed that there are two entries under the above topic in CF.(snip)
*Holzwarth, W.
Message 7 of 7 (81 Views)

Re:

11-16-2002 05:33 PM in reply to: *Holzwarth, W.
Thanks for your hints, Jeff
I did so, and it worked so far. I just remember the trick with the dummy
part, to whose motion all other movements are set in relationship.

But shouldn't be more comfort in driven constraints? I'd like it very much,
if I could simulate the movement of my construction on the screen.
Otherwise, there are still problems in:

- Simultaneously driving constraints in separate assemblies (There's an
retractable front gear, too, that is moving at the same time)
- Simultaneously driving several instances of the same unit (Maybe clamping
fixtures, or other things)
- Driving transitional constraints. I here have an example (crankshaft of a
one-cylindrical R/C four-stroke engine with two cam followers). It can be
driven by hand, but the automatic motion doesn't run. I just thought to
delete the second follower for testing, but it doesn't work with only one
instance, either ..

But I have to say, I can do much more of these things, than I could do with
MDT6. On the other hand, I could reorder parts in MDT even from one
sub-assembly to another, without losing constraints.

Thanks for all of your inputs
Walter

"Jeff Howard" schrieb im Newsbeitrag
news:B0B82A4C2196746BEF8EBBB79C720A50@in.WebX.maYIadrTaRb...
> If it's any help, I did get the assy to articulate by copying the actuator
and
> making it adaptive as well, then driving both left and right sides via an
> assembly work plane. Can post to CF is you'd like.
>
> Jeff
> ===============
>
>
>
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