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Sheetmetal voodoo - does anyone have tips for new users

psobejko
12-Amethyst

Sheetmetal voodoo - does anyone have tips for new users

An engineer who is new to Creo Parametric sheet metal module has has asked me this seemingly easy question:  Why can't he convert this part made in standard part-modeling mode to sheet metal:

test_sheetmetal_prt.png

 

The failure diagnostic mentions non-uniform wall thickness.  Yet it's hard to explain why that is.

Moreover, I find it disappointing that even when facing such a simple design task - once again, one needs to discover what is the "ptc-way" of doing things.

 

Please send links to tutorials, youtube videos and forum posts which would help with this.


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5 REPLIES 5
RaphMORIN
13-Aquamarine
(To:psobejko)

Hi

I don't have links to give but in this case the method is not good. You must not use the shell function in solid part. You must use the shell function located in the solid => sheetmetal conversion.

Then you must use this other conversion tool to define seems and bends.

Here it is !!

You'll find attached the modified file that works fine.

psobejko
12-Amethyst
(To:RaphMORIN)

Thanks Raphael - but why is my method not good?  (quick answer: because it doesn't work in Creo).  But the real problem is that the workflow of turning a conceptual solid-model into a manufacturable sheet-metal model is not supported very well because the conversion tool has problem with the most basic geometry!

RaphMORIN
13-Aquamarine
(To:psobejko)

To convert a solid part to sheetmetal using driving surface, it requires that the model have a constant thickness. In this case thickness is not constant because of the corners I surrounded below.

It's true this is painful. Often, when a customer gives me a step file of a sheetmetal part, I can't convert it directly in Creo for different reasons. For exemple, if the part contains hole with countersink, I have to remove all of them before converting.

When drawing a sheetmetal part, you have to think before on how you're going to build it to get the best results. I think the best way to be efficient is to follow a training. This is what I did several years ago and I think this is really valuable.

Basically, when designing a sheetmetal part I use these two methods :

• Starting from a solid part then converting using the shell command as I showed before

• Design directly in sheetmetal using a plane or an extrusion

psobejko
12-Amethyst
(To:RaphMORIN)

I don't buy the argument about the constant thickness.  Note how the shelled box by itself will be converted to sheet-metal successfully:

test_sheetmetal_prt - conversion works.png

The original part that fails isn't much more complex and so I think that PTC needs to improve their conversion algorithm.

RaphMORIN
13-Aquamarine
(To:psobejko)

For sure, it would be nice if the algorithm would be improved. I was just telling how it works actually.

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