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Exporting for Autocad - polylines vs splines
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flatpack  
#1 Posted : Friday, April 5, 2019 7:59:04 AM(UTC)
flatpack

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Hi, I've had some issues with ACAD users when I export from Shark to .dwg:

the curves which I've created using the 3-point Conic are seen as splines to the ACAD users.
It needs to be polylines for programming to cut.

Are conics splines? If so, what tools can I use to create curves to that they are exported as polylines? Or - what exporting parameters should i set?

Thanks!
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L. Banasky  
#2 Posted : Friday, April 5, 2019 10:02:56 AM(UTC)
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I am not familiar with the 3 point conic, but I've always had
good results exporting as an R12 .dxf for CNC plasma, waterjet and milling machine
files.
Larry
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jdi000  
#3 Posted : Friday, April 5, 2019 10:17:27 AM(UTC)
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Originally Posted by: flatpack Go to Quoted Post
Hi, I've had some issues with ACAD users when I export from Shark to .dwg:

the curves which I've created using the 3-point Conic are seen as splines to the ACAD users.
It needs to be polylines for programming to cut.

Are conics splines? If so, what tools can I use to create curves to that they are exported as polylines? Or - what exporting parameters should i set?

Thanks!



Hello

Use the tool in the arc pallet called "Arcs From Curves" Arcs are much better for CNC equipment than polylines.

Regards
Jason
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MPSchmied on 4/5/2019(UTC)
flatpack  
#4 Posted : Friday, April 5, 2019 10:21:21 AM(UTC)
flatpack

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Originally Posted by: L. Banasky Go to Quoted Post
I am not familiar with the 3 point conic, but I've always had
good results exporting as an R12 .dxf for CNC plasma, waterjet and milling machine
files.
Larry




Thanks Larry, I've been exporting as a 2013 .dwg, 2d flat drawings – mainly because that is the standard they request.

is a .dxf mainly for 3d? Not super knowledgeable about that.
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flatpack  
#5 Posted : Friday, April 5, 2019 10:22:52 AM(UTC)
flatpack

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Originally Posted by: jdi000 Go to Quoted Post


Use the tool in the arc pallet called "Arcs From Curves" Arcs are much better for CNC equipment than polylines.

Regards
Jason



Ok noted with thanks. Could you kindly elaborate on how it works please? I've never used it before.
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UGMENTALCASE  
#6 Posted : Friday, April 5, 2019 11:30:26 AM(UTC)
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I can open 2010 autocad files if you would like me to check them for you? See that we get it right before you go to your customer with it?
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flatpack on 4/12/2019(UTC)
L. Banasky  
#7 Posted : Friday, April 5, 2019 1:11:31 PM(UTC)
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<<<<<Thanks Larry, I've been exporting as a 2013 .dwg, 2d flat drawings – mainly because that is the standard they request.
is a .dxf mainly for 3d? Not super knowledgeable about that.>>>>>

Mostly for 2d outlines, depends on the CAM program, really 2 1/2 d, the .dxf
files can be used for drilling and tapping, milling pockets and slots etc.
Larry
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L. Banasky  
#8 Posted : Monday, April 8, 2019 5:09:31 AM(UTC)
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Just in case you miss converting to an ARC or LINE.
The EXPORT to r12 .dxf does it automatically.
Larry
File Attachment(s):
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flatpack on 4/12/2019(UTC)
jdi000  
#9 Posted : Monday, April 8, 2019 5:33:14 AM(UTC)
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Originally Posted by: L. Banasky Go to Quoted Post
Just in case you miss converting to an ARC or LINE.
The EXPORT to r12 .dxf does it automatically.
Larry


Larry

Aren't these lines polylines and can have many little lines causing stops and starts if everything is arcs its a much smoother cut.


Regards

Jason
Windows 11, 10
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L. Banasky  
#10 Posted : Monday, April 8, 2019 6:36:32 AM(UTC)
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Seems to be a non-segmented line, I've been using the r12 .dxf
export for over 10 years, and the CNC plasma cuts fine.
Really don't know the difference between a Curve, Line, or Polyline.
Just works.
Larry
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jdi000  
#11 Posted : Monday, April 8, 2019 6:39:00 AM(UTC)
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Originally Posted by: L. Banasky Go to Quoted Post
Seems to be a non-segmented line, I've been using the r12 .dxf
export for over 10 years, and the CNC plasma cuts fine.
Really don't know the difference between a Curve, Line, or Polyline.
Just works.
Larry


Larry

Yes I guess it depends on the software generating the cnc code, and how it handles splines and polylines.

Regards

Jason
Windows 11, 10
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thanks 1 user thanked jdi000 for this useful post.
MPSchmied on 4/9/2019(UTC)
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