Bend Radius Incorrectly Generating at Zero

[SteveJJH]

Hi all,

I have a sheet metal part that is doing something a bit strange.

The part is a symmetrical thin feature, it is 2mm thick and has an inside bend radius of 2mm. However one of the bends on one side is generating at zero radius inside.

If I try changing the thin feature to the other side of the line, a different bend fails.

I have tried ditching the model and completely starting again with a new part, but it fails on the very same bends.

Even by manually changing the bend radius of that one bend, the flat pattern still fails.

Maybe I’m not spotting something, but it seems like a bug to me. Has anyone else seen anything like this? I did a search and didn’t see anything.

Thanks

 

[Jboggs]

You are mixing two different SW features I have never tried together before, thin features and sheet metal. "That day I went to training" they never mentioned doing that. That could be the source of your problem.

 

[SteveJJH]

I've done it many times before, but perhaps not in SW2015.

If anyone out there is running an earlier version of SolidWorks and has a spare few minutes, could a kind person try sketching up the attached image and making it a thin sheet metal feature?

p.s. sorry I didn't make it clear the model with the issue is attached to the first post.

 

[SteveJJH]

Answering my own question a little, I found a machine which had 2013sp5.0 on it and tried it.

No Errors.

 

[CorBlimeyLimey]

With SW15-SP3, I downloaded the original file, deleted the Sheet-Metal feature to leave only the sketch, and then used the Base Flange/Tab tool to recreate the part ... no problem encountered.

I also opened the original file, entered the Edit Sketch mode, did a Ctrl Q to force rebuild and exit the Edit Sketch mode and again, no problem encountered.

 

[SteveJJH]

Well, that is strange. Ctrl Q is of course one of the first things I try in this situation, so I had tried that (and even just tried it again because I doubted myself). It is not removing the issue for me, however I am running sp2.1

There doesn't seem to be any mention of this fix in the SPR list I downloaded before my subscription expired.

 

[SteveJJH]

We're still getting this issue. I've attached another example, drawn from scratch (by the same user coincidentally).

I've tried deleting the features (leaving the sketch) and creating a new base flange, but it still has one of the bends (BaseBend2) at zero bend radius.

Is anyone out there running 2015sp2.1 having the same problem?

If there's someone out there with a later service pack, can they try it?

 

[SBaugh]

Instead of redoing the base flange I used sketched-Bend to make the final 2 bends to get around the issue you were seeing.

I used SW 2015 SP3

Scott Baugh, CSWP
Gryphon Environmental

http://www.2gryphon.com

"If it's not broke, Don't fix it!"

faq731-376

 

[SteveJJH]

Yes, Thanks Scott, I've recommended to the user in question that he re-model it using edge flanges. Did you try just doing a rebuild in SP3? I think SolidWorks may have fixed the issue, although I can't see it in the fixed SPR list for SP3

 

[SteveJJH]

OK, this seems to be becoming a serious issue. Any time we do a sheet metal thin feature it has this problem. I've attached an example of something we make that is going to be a real pain to model up any other way I can think of. Is there any chance someone can do a re-build in a later service pack of SolidWorks and see if it fixes it?

It would be very greatly appreciated.

 

[SteveJJH]

I figured out a way of modelling it differently. I used thin extrude and then insert bends, but I'm still interested to know if this is exclusive to SW15 SP2.1 and if anyone else is getting it.

 

[SBaugh]

You might want to include the gauge table you are using. Once I remove your table and use the default K-factor it works completely fine. So to me its the bend allowance you have setup in the table.

Scott Baugh, CSWP
Gryphon Environmental

http://www.2gryphon.com

"If it's not broke, Don't fix it!"

faq731-376

 

[SteveJJH]

Ah, sorry. I have tried it with a K-factor instead and I still get the problem, so I can only assume the problem was fixed between my service pack and yours.

 

[SBaugh]

Possibly... using SP4

Scott Baugh, CSWP
Gryphon Environmental

http://www.2gryphon.com

"If it's not broke, Don't fix it!"

faq731-376

 

[SteveJJH]

Yeah, we're stuck on SP2.1 here. I think the thin extrude then insert bends method should get round it in any situation I can think of though.