Export Gear Face to .dxf

[lodes39]

Hello,

I'm trying to figure out, how to Export Face of the gear to .dxf

 .dxf cut line looks different:

I've tried Export Face from Created Simplified Part of gear, but I got DXF/DWG Export Error

[swalton]

Remember that the gear generator makes simplified teeth, not true involute ones.

To get a true involute tooth form export, use the "Export Tooth Shape" command.

https://help.autodesk.com/view/INVNTOR/2021/ENU/?guid=GUID-06A48C0A-62F6-4EBA-9DE0-49E2A13F2B15

[lodes39]

Hello @swalton 

Thank you for your replay

The gear model I use already has a true involute tooth, but exports face cut line with simplified gear (like from gear generator) to .dxf

Now I find out, that the problem is different, because I've tried just drawing arc lines over the edges to extrude gear shape and then export face.

Looks like .dxf does not contain oval lines from sketch for any shape (not only gear), because CNC receives the same incorrect cut where the oval lines are replaced by direct (except complete circle). Seems like, it is not some kind of .dxf external view error

[JDMather]

@lodes39 

You did not attach your *.ipt file here for demonstration.

You need to set the dxf output to splines rather than simplified straight lines.

[lodes39]

@JDMather 

Hello!

Thank you for your replay

It happens with any .itp part file if I Export Face As and DXF Export Options window does not contain General/Layer/Geometry Flat Pattern options

[TheCADWhisperer]

If you had Attached your *.ipt file here I would have demonstrated how to save the dxf correctly.

[lodes39]

@TheCADWhisperer 

Hello!

Thank you for your replay

It is not the gear, just a simple shape with the same .dxf result:

[NigelHay]

JD, how do you get to that dialogue box? If I try to DXF a part drawing which includes a flat pattern I can't find the option to replace splines.

[JDMather · Accepted solution]

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@lodes39 wrote:

... just a simple shape with the same .dxf result:

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Before I show the solution - what program are you opening the dxf file in?

When I Open the dxf file that YOU attached in AutoCAD this is what I see...

...if I Explode the polyline and run the List command ...

the geometry is reported as Arcs.

In the video I forgot to mention turning off arc center point layer...

in AutoCAD you could also turn it off after the fact,

but if you are using some other software with the dxf you probably want to turn it off in Inventor before saving the file.

[lodes39]

@JDMather 

Thank you for your explanation!

It turns out, that the .dxf is correct and the problem with the CNC machine software.  At the same time, unlike using of Export Face As, and according to your guide with Convert Sheet Metal and Create Flat Pattern Save Copy As Flat Pattern DXF Options Geometry Replace Splines now .dxf shows correct lines on my side too with gear-d.ipt  (files attached), which is extruded drawing over generated gear edges, just simple form, same as "whisper" shape from example:

if I use the same method for generated gear-g.ipt spur gear with involute tooth:

[JDMather]

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@lodes39 wrote:

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The file gear-g.ipt that you Attached here has NOT been converted to Sheet Metal.

You MUST do this step first.

Inventor does not always pick up the Thickness, so you MUST verify that it matches the part (3.9mm in this case).

Then all will work as expected.

BTW - you should download the Updates for 2019 while they are still available.

http://manage.autodesk.com

[lodes39]

@JDMather 

Sorry, I've missed Sheet Metal Defaults Thickness 3.9mm.

Using the Flat Pattern shows and cuts correctly.

.dxf saved by Export Face As seems like also should work fine, but not with an actual device application (because not only shows but cuts the incorrect lines).

Thank you for your support and explanation!