CNC Path along a 3D curve

Here's the place for discussion related to CAM/CNC and the development of the Path module.
freecad-heini-1
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Re: CNC Path along a 3D curve

Postby freecad-heini-1 » Mon Jan 15, 2018 5:45 pm

Thank you my Freecad friends for your answer.

What about if I limit the shape with a cut with offset 3mm from the curve?
cnc_path_alonge_the_yellow_edge1.png
cnc_path_alonge_the_yellow_edge1.png (28.92 KiB) Viewed 632 times
Is it then possible to mill just the face and the curve?
fc-017_path_edge1.fcstd
(147.92 KiB) Downloaded 17 times
chrisb
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Re: CNC Path along a 3D curve

Postby chrisb » Mon Jan 15, 2018 6:30 pm

freecad-heini-1 wrote:
Mon Jan 15, 2018 5:45 pm
Is it then possible to mill just the face and the curve?
I get errors on loading:

Code: Select all

<unknown exception traceback><type 'exceptions.ImportError'>: No module named CompoundFilter2
probably due to missing workbenches. Can you please upload it as simple copy.
You need at least FreeCAD 0.19.23300 to edit my current sketches.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
freecad-heini-1
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Re: CNC Path along a 3D curve

Postby freecad-heini-1 » Mon Jan 15, 2018 6:37 pm

chrisb wrote:
Mon Jan 15, 2018 6:30 pm
freecad-heini-1 wrote:
Mon Jan 15, 2018 5:45 pm
Is it then possible to mill just the face and the curve?
I get errors on loading:

Code: Select all

<unknown exception traceback><type 'exceptions.ImportError'>: No module named CompoundFilter2
probably due to missing workbenches. Can you please upload it as simple copy.
Yes Chris.
clone_path_along_edge.fcstd
(40.93 KiB) Downloaded 13 times
herbk
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Re: CNC Path along a 3D curve

Postby herbk » Mon Jan 15, 2018 8:06 pm

Hi Wilfried,
i can open bouth files and can create a 3D-Pocket without FC crashes, - buts the only thing...
FC dosn't create a path like you want to have it...

3D-Pocket's orientation is the buttom of the part and if the tool touches the ground on tools outside and dosn't remove the material in the corner like you want it.

Path from shape follows the corner very good, but accepts no ramp entry dressup.and dosn't compensate the tool diameter. Last point isn't e big problem, because prof. machinecontrolers can do that by itselv, - and that what you want to do is only possible on a profesional machine. ;)

Path from shape shows a other strange behavior to:
If you select the lower edge (wich you want to "clean") the created path is only less a halv round. If you select the edge a little bit above, it creates the same short path at that level, but steps down then to the lower edge and follows it for a full round.
Gruß Herbert
chrisb
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Re: CNC Path along a 3D curve

Postby chrisb » Mon Jan 15, 2018 9:50 pm

freecad-heini-1 wrote:
Mon Jan 15, 2018 6:37 pm
clone_path_along_edge.fcstd
- Select flat top around the oval
- Path Profile, Cut inside, process holes, use compensation
- Ramp entry dressup Method 3
Bildschirmfoto 2018-01-15 um 22.46.42.png
Bildschirmfoto 2018-01-15 um 22.46.42.png (44.66 KiB) Viewed 603 times
Other ramp entries are possible e.g. helix:
Bildschirmfoto 2018-01-15 um 22.48.37.png
Bildschirmfoto 2018-01-15 um 22.48.37.png (44.26 KiB) Viewed 603 times
Attachments
clone_path_along_edge_cb.fcstd
(81.11 KiB) Downloaded 16 times
You need at least FreeCAD 0.19.23300 to edit my current sketches.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
freecad-heini-1
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Re: CNC Path along a 3D curve

Postby freecad-heini-1 » Mon Jan 15, 2018 10:35 pm

Whow, great, thank you so much.

What about the toolpath simulation like to see here?
phpBB [video]
chrisb
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Re: CNC Path along a 3D curve

Postby chrisb » Mon Jan 15, 2018 10:44 pm

freecad-heini-1 wrote:
Mon Jan 15, 2018 10:35 pm
Whow, great, thank you so much.

What about the toolpath simulation like to see here?
phpBB [video]
It's currently not working properly. The tool moves but takes no material off.
You need at least FreeCAD 0.19.23300 to edit my current sketches.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
herbk
Posts: 1989
Joined: Mon Nov 03, 2014 3:45 pm
Location: Windsbach, Bavarya (Germany)

Re: CNC Path along a 3D curve

Postby herbk » Tue Jan 16, 2018 4:33 pm

Hi Chris, hi Wilfried,

the path chris crated is not correct, change the color of the part an you will see, that the path runs imto the material.

The reason is, the selected face is not realy flat, differents are around 0,3mm and "Contour from face" seams not take attention about it
Attachments
clone_path_along_edge_cb.jpg
clone_path_along_edge_cb.jpg (48.34 KiB) Viewed 552 times
Gruß Herbert
chrisb
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Re: CNC Path along a 3D curve

Postby chrisb » Tue Jan 16, 2018 5:26 pm

herbk wrote:
Tue Jan 16, 2018 4:33 pm
The reason is, the selected face is not realy flat, differents are around 0,3mm and "Contour from face" seams not take attention about it
I see. The outside is higher, which means that it is impossible to mill it.
You need at least FreeCAD 0.19.23300 to edit my current sketches.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
herbk
Posts: 1989
Joined: Mon Nov 03, 2014 3:45 pm
Location: Windsbach, Bavarya (Germany)

Re: CNC Path along a 3D curve

Postby herbk » Tue Jan 16, 2018 5:57 pm

Not only the outside...(Wilfried said that at first post.) If you make a "path by shape" and take a look at the Z levels you will see it.
Attachments
clone_path_along_edge_cb_2.jpg
clone_path_along_edge_cb_2.jpg (77.82 KiB) Viewed 534 times
Gruß Herbert