Dwg / dxf exports for CAM, Arcs still flipping randomly

[endlessfix]

I’m pretty tired of this problem. It’s been coming up for years now for me and I’ve never truly solved it. Here are some OLD threads about it:

Polylines with real arcs for CNC Router?

Ian - The SCM Zilog 3 came out in 1999 and the SCM Zilog Plus came out in 2000. It appears that they are using the WoodWOP software (very crude). I have a client in Denmark who ran a Homag pod style CNC router with tool changer. He imports my DXF’s without any trouble. He wanted to do horizontal drilling but it turns out that WoodWOP has basterdized block inserts in a proprietary way. Suffice it to say - he has since stopped using the Homag and is now using cabmaker and its nesting capabilities…

.dwg export curves are reversed

Exporting a tool path in 3D .dwg from plan view, parallel projection, lines only, outputs with some of the curves in reversed orientation. I remember this was solved at one point in the past but I can’t find the link right now. I believe it ended up having something to do with curves being left to right or right to left. Anyone remember what the annoying cause of this behavior is and how to correct it? [10%20PM]

Here is an example in SketchUp (looks good) output as .dxf and viewed in CAD (still looks good), then viewed getting ready for CAM (arcs flipped and reversed).

I do a bunch of designing for 2D manufacture and this problem is unpredictable for me. I know it’s a by-product of mirroring and flipping or clockwise creation of the arc, but I am really hoping for an easier way. Is there anyone else out there outputting toolpaths for CNC (router/laser/plasma)? I’m searching for success stories of a clean pain free pathway for true arcs and circles into CAM. Thanks.

[Charlie_v]

@endlessfix

I’m searching for success stories of a clean pain free pathway for true arcs and circles into CAM

I am too! (Directly out of SU)
Sorry I don’t know solution, just bolstering need for it.

[gkernan]

SimpleDXF will do 2D or 3D and does produce true arcs when importing SimpleDXF (not SU import)
Remember that SU will show arcs as segmented