Flat pattern error?

[erikPJRTR]

Some times i experience either an error or lack of knowlage while trying to make a flat pattern for a sheet metal part. 

Right know im trying to make a DXF from a super simple 180mm round, 20mm flat flange with 4 holes through. Imagine a big washer but with 4 smaller holes instead of 1 big in the center. 

I have started with a sketch, extruded it as a solid, converted to sheet metal part and now trying to create a flat pattern, while creating the flat pattern Fusion asks for its stationary face, while choosing the top side and press "OK" its creating the flat pattern from the side of the flange (originally the front face and not the top as choosen), why is that happening? 

[CGBenner]

@erikPJRTR 

Hello & welcome!  If possible please attach your file here so others can see what you are working with and offer some suggestions.  Good luck!

[erikPJRTR]

Hi,
Thank you.

I shared it with a link: 
https://a360.co/4e4AmUG

I know that there is shorter ways to create a DXF output of a drawing but my workflow have been to do this way as i can keep all the flat patterns/DXF outputs for each body under each component, My thought is that it is sorted and good for all parts that will be out of sheet and lazercut either if they are flat or bent. 

I just realized that if extruding or flangeing the same piece to 5mm instead of 20mm it works great, can we call it a bug? 

[HughesTooling]

There is a bit of a bug if you create a flat pattern from a part with no bends. I think it will only work if you have the sketch on the XY plane and extruded along the Z. Think Fusion needs to be setup with Z up in preferences. Also makes it easier if you export your design as a f3d and attach.

[erikPJRTR]

I tried different thickness in the design, if editing the extrusion to 11mm or below it will automaticly create the flat pattern in the correct orientation, if 12mm or over it does change the orientation and making the flat pattern from the side of the flange based on the exact same stationary face. 

[TrippyLighting]

Scratch that!

[erikPJRTR]

I have made the drawing in the XY position, on the bottom from the top. 

If making the diameter larger it will accept the thnickness to be thicker with the "right" orientation.  

File attached. 

[erikPJRTR]

I may not making it the right way by using the flat pattern for already flat pieces, but feel it is really handy to have it all collected under each component.

[HughesTooling]

If you are only working on a single part and you need to export to DXF it's probably easier to just use Save As DXF from the right click menu clicking on the sketch. The problem you're seeing has been reported several times but no fix yet.

[erikPJRTR]

Yeah, i know. 

But my OCD likes procedures, in my point of view it is very non logical to make the procedure different from a bent plate or a flat plate as they are both plates that need to have a DXF output for cutting, mostly ofc for assemblys where you have some bent and some flat parts.. Sheet as sheet. 

So in my opinion it is a very disturbing bug. 

However i now know it is a bug related to the ratio of diameter/surface area and thickness. I really hope there will be a soloution for this problem. 

[CGBenner]

@erikPJRTR Did the information provided answer your question? If so, please use Accept Solution so that others may find this in the future. Thank you very much!