Inventor General Discussion

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*Germer, Ole
Message 1 of 4 (45 Views)

Fold Error

45 Views, 3 Replies
11-22-2002 10:13 PM
There is an error in the fold options. This is pretty bad!

I am bending a 5/16 sheet using fold. The sheet is finished trimmed and
then folded 1 1/2 inches in from a 45 degree cut in the sheet. The fold is
90 degrees. The final location is the third choice in the Fold:Fold1 pick
window. That means the final position of the physical bend is fixed with
this option. The actual brake press point of hit is back relative to
Kfactor.
If I change the Kfactor, the actual width of the strip that got bend
should change relatively but the final position should remain the same.
BOTH CHANGE when I do this. This is not a computer code error but
rather a DRAFTING ERROR and a misunderstanding of the part of the
programmer.

I will post my example in customer-files.



--
Ole Germer
Helping create better involute profiles for gears
http://www.geocities.com/olegermer/index.html
*Adams, Brad
Message 2 of 4 (45 Views)

Re: Fold Error

11-25-2002 07:08 AM in reply to: *Germer, Ole
I don't agree with you. If you change the Kfactor the part will grow or
shrink accordingly. The Kfactor is trying to determine the amount of
material it takes to go from the start of your bend to the end of the bend.
So a bend at a Kfactor of .5 will use up more of the material to complete
the bend than a bend with a Kfactor of .2. So if you fix it so that the
start of the bend is 1.50" from the edge and it takes .589" (at a Kfactor of
.2) of material for the bend whatever material is left will end up for the
flat area between the end of the bend and the edge. But with the Kfactor of
.5 it uses .736" of material to make the bend and since you still started
the bend at 1.50" from the edge you will have less material left over for
the flat area after the bend.
Because you are not measuring at a right angle to the bend the differences
between the 2 Kfactors is much greater than if you where to measure at a
right angle to the bend.
*Germer, Ole
Message 3 of 4 (45 Views)

Re:

11-25-2002 07:47 AM in reply to: *Germer, Ole
"Brad Adams" wrote in message
news:752ACA33732EDD487760E39041B0EC52@in.WebX.maYIadrTaRb...
> I don't agree with you. If you change the Kfactor the part will grow or
> shrink accordingly. The Kfactor is trying to determine the amount of
> material it takes to go from the start of your bend to the end of the
bend.

The choice was fix the final point. Change the other parameters. That is
what Inventor implies with their dialogue location picks for .

> So a bend at a Kfactor of .5 will use up more of the material to complete
> the bend than a bend with a Kfactor of .2. So if you fix it so that the
> start of the bend is 1.50" from the edge and it takes .589" (at a Kfactor
of
> .2) of material for the bend whatever material is left will end up for the
> flat area between the end of the bend and the edge. But with the Kfactor
of
> .5 it uses .736" of material to make the bend and since you still started
> the bend at 1.50" from the edge you will have less material left over for
> the flat area after the bend.

If you measure at right angle there is still a difference.

> Because you are not measuring at a right angle to the bend the differences
> between the 2 Kfactors is much greater than if you where to measure at a
> right angle to the bend.
>

Finally:

It finally dawned on me. My approach is maybe a little wrong. If I stick a
dimension from the upper right angled corner to the bend line, and make the
1.5 inches to the fold driven, the result should be what I expect. Changing
the kFactor does not change the final position of the flange, only the
width of the flange. You give it try.
It is still wrong.

Ole
*Autodesk\
Message 4 of 4 (45 Views)

Re: Fold Error

11-25-2002 08:25 AM in reply to: *Germer, Ole
There is nothing wrong with this part. You dimensioned the bend line 1.5"
from the edge. You selected the option that the bend line defines the end of
the bend. In each of your examples, the end of the bend is 1.5" from the
edge. It is doing exactly what you are telling it to do.

Loren Jahraus
Autodesk Inventor Workflow Team

"Ole Germer" wrote in message
news:F39F003FA65AF78B465F88F8593D9FD3@in.WebX.maYIadrTaRb...
> There is an error in the fold options. This is pretty bad!
>
> I am bending a 5/16 sheet using fold. The sheet is finished trimmed and
> then folded 1 1/2 inches in from a 45 degree cut in the sheet. The fold is
> 90 degrees. The final location is the third choice in the Fold:Fold1 pick
> window. That means the final position of the physical bend is fixed with
> this option. The actual brake press point of hit is back relative to
> Kfactor.
> If I change the Kfactor, the actual width of the strip that got bend
> should change relatively but the final position should remain the same.
> BOTH CHANGE when I do this. This is not a computer code error but
> rather a DRAFTING ERROR and a misunderstanding of the part of the
> programmer.
>
> I will post my example in customer-files.
>
>
>
> --
> Ole Germer
> Helping create better involute profiles for gears
> http://www.geocities.com/olegermer/index.html
>
>

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