Multiple entities in dxf export

Chowderhead · Post by **Chowderhead** » Fri Apr 12, 2019 2:22 pm

I'm sure I'm doing something wrong. When exporting the attached file as a dxf for laser cutting, it creates a file appearing to have four copies of every entity. After tediously removing the seemingly duplicate entities, I am unable to produce complete polylines, which I presume means the entities are discontinuous. I've tried the drafting shape 2d view, but it doesn't maintain the involute faces in the projection, and when I enable tessellation, it produces a weird and unusable result.

Any help much appreciated.

OS: Debian GNU/Linux 9.7 (stretch) (XFCE/xfce)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15609 (Git)
Build type: Release
Branch: master
Hash: a14af0f2bd26f980d71be80a799ee48127bc7619
Python version: 2.7.13
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17
Locale: English/UnitedStates (en_US)

Post by **wandererfan** » Fri Apr 12, 2019 7:56 pm

Chowderhead wrote: ↑Fri Apr 12, 2019 2:22 pm ...but it doesn't maintain the involute faces in the projection....

The attached file seems to have splines on the teeth instead of straight lines. Is it closer to what you need?

OCC version: 6.8.0.oce-0.17

This version is almost prehistoric. OCC 7.3 is much better.

Chowderhead · Post by **Chowderhead** » Fri Apr 12, 2019 10:34 pm

Thanks for the reply. I'll update OCC.

Attached is what I see upon opening the file you provided. Not sure what's up.

Post by **wandererfan** » Sat Apr 13, 2019 12:13 am

Chowderhead wrote: ↑Fri Apr 12, 2019 10:34 pm Attached is what I see upon opening the file you provided. Not sure what's up.

Hmm, looks good in DraftSight...

: advance_small_gear.png (95.96 KiB) Viewed 1152 times

Let me dig some more.

Post by **wandererfan** » Sat Apr 13, 2019 12:35 am

Looks good in FreeCAD too;

: advance_small_gear_New_FC.png (11.63 KiB) Viewed 1147 times

Try this FCStd file and let me know what you see.

OS: Linux Mint 19
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16093 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 690774c0effe4fd7b8d2b5e2fb2b8c8d145e21ce
Python version: 2.7.15rc1
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Canada (en_CA)

Post by **jmaustpc** » Sat Apr 13, 2019 1:13 am

There are a lot of settings for DXF in FreeCAD. I went through some of them and experimented on the result.

wandererfan wrote: ↑Sat Apr 13, 2019 12:35 am Looks good in FreeCAD too;

you appear to be using the "legacy python importer" which does import your dxf file

Chowderhead wrote: ↑Fri Apr 12, 2019 10:34 pm Not sure what's up.

and you appear to not be doing so.

I had to install it via the "tools menu...add-ons manager....workbenches tab...dxf library".

Interestingly, the "import splines as polylines" option seems not to work, i.e. splines were still imported.

Either create simple shapes or Draft WB Objects both work but create a sketch fails

OS: Kubuntu 18.04.2 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.1.
Build type: Release
Python version: 3.6.7
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Australia (en_AU)

Chowderhead · Post by **Chowderhead** » Sat Apr 13, 2019 10:01 am

Thank you both for the replies. Installing the dxf library did the trick. I'm off to cut parts!

Post by **wandererfan** » Sat Apr 13, 2019 1:10 pm

jmaustpc wrote: ↑Sat Apr 13, 2019 1:13 am you appear to be using the "legacy python importer" which does import your dxf file

Yes, legacy importer, new exporter. Did not get good results in this case with the legacy exporter.

Multiple entities in dxf export

Multiple entities in dxf export

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