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Turbo Talk => General Discussion => Topic started by: denis1024 on July 12, 2018, 12:07:43 AM

Title: 3D to DXF for CNC
Post by: denis1024 on July 12, 2018, 12:07:43 AM
Hi all,
Imagine a box (enclosure for electronics) with a hole on the top facet. I want to export a dxf to my CAM software. The result must be a square with a circle, but in fact I get also the objects viewed through the hole (=objects inside the box on the opposite facet, like slots cutted in the box ).
My question is what is the best method to get a "surface view" of the box, and the a clean DXF ?
Thanks, Denis

TC PRO PLATINUM 2017
Title: Re: 3D to DXF for CNC
Post by: Jason B on July 12, 2018, 07:53:51 AM
What type of CNC work are you doing? If you are cutting plate on water jet, laser, or plasma, you need only a 2D drawing with the profile you wish to
cut. My plasma and water jet machine CAM software can't handle anything other than 2D drawings in DXF format. And the drawing should contain ONLY the profiles to be cut, 1:1 scale in model space, no annotations and nothing in paper spaces.
Title: Re: 3D to DXF for CNC
Post by: denis1024 on July 12, 2018, 08:56:46 AM
I use 2.5D with a milling machine. My question was just about a clever method, because  I clean the dxf by hand in order to get only the outline of the box and the circle of the hole.
I just wonder if TC can make a view of a 3D model (without hidden lines : ok I know  how doing that) without the elements that are visible through the hole.
Title: Re: 3D to DXF for CNC
Post by: murray dickinson on July 12, 2018, 04:01:56 PM
Section tool is simple for your needs. 
Title: Re: 3D to DXF for CNC
Post by: Jeffin90620 on July 13, 2018, 05:41:37 PM
I just wonder if TC can make a view of a 3D model (without hidden lines : ok I know  how doing that) without the elements that are visible through the hole.

If you plan to use the Section tool, then you should make sure that the lid has no curved edges, because that will change the dimensions.


Jeff
Title: Re: 3D to DXF for CNC
Post by: denis1024 on July 16, 2018, 07:18:44 AM
Hi, do you mean for "section tool"  :  "create by viewline" ? If yes, the model will be seen from inside to outside with hatches.
I have joined some snapshots :
"model" is the case
"paper space" is what I normally get. Then I explode the drawing on paper space in order to clean
"hole zoomed" show a problem : if the arcs and small lines are too smal small, I have a risk to transfer to CNC software
"for cnc" is what I want.

Hope it is more clear (since now I AM A WORLD CHAMPION ;-)



Title: Re: 3D to DXF for CNC
Post by: Jeffin90620 on July 16, 2018, 02:06:09 PM
Check with your fab house beforehand.  It may be better to re-design the box so that the panel side that is CNC-cut is a separate piece.


Jeff


Title: Re: 3D to DXF for CNC
Post by: murray dickinson on July 16, 2018, 02:46:07 PM
The drafting palette in your TC version is another way to get the result you want.   Why buy the bells and whistles and not use them?
Title: Re: 3D to DXF for CNC
Post by: denis1024 on July 16, 2018, 11:51:44 PM
@Jeffin : yes, sure.
 But this box is more an example for illustrating the method I need to export a "clean" DXF (without unwanted lines ) to a CAM software.

@Murray : Yes, it is what I want to do !
 I just understood something : "Section Tool" is "Slice by workplane" ? In this case, thanks, It is what I want.


I'm sure that all people who export data to CAM have the same problem. Maybe they re-draw (with polyline) the outline of all entities that will be machined ?


Thanks

Denis
Title: Re: 3D to DXF for CNC
Post by: Jeffin90620 on July 17, 2018, 02:20:04 AM
The Section tool is more flexible than merely Slice by Workplane.


Jeff
Title: Re: 3D to DXF for CNC
Post by: murray dickinson on July 17, 2018, 04:25:13 AM
No, slice by workplane is a physical tool that cuts a solid or surface object into two parts, section traces a 2D graphic, a group of lines, arcs and curves, along the edges of the physical object on the defined plane that passes through it, leaving the object unchanged.

The drafting palette has options that might make sections more suitable for CNC, like "convert curves to polylines" option.  Most lower-end toolpath generators deal with polylines and arcs, but not splines.  Having TC explode them automatically is a benefit that vanilla section doesn't do. 

Title: Re: 3D to DXF for CNC
Post by: denis1024 on July 17, 2018, 04:51:54 AM
Thank you. I finally found what I wanted. Forum is really a great place.

For other people that have the same need :

Place the workplane on the desired side of the object
<Modify>, <Section>, unselect "Create hatch"
select the object
click on "Section By Workplane"

TC makes a carbon copy of the facet.
Explode the created group if you want and "Save as DXF" the selection.
Perfect !