noob surface contour question

Here's the place for discussion related to CAM/CNC and the development of the Path module.
Erich Schulz
Posts: 141
Joined: Tue May 07, 2019 10:50 pm
Location: Brisbane, Australia

noob surface contour question

Postby Erich Schulz » Tue Jun 04, 2019 7:38 am

sorry I'm a noob at both freeCad and CAM

but cant figure out how to get a path that follows the contor of my object

OS: Ubuntu 16.04.6 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.1.
Build type: Release
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Australia (en_AU)

I'm either missing something or not getting something?

thanks in advance!
Attachments
test.FCStd
(69.54 KiB) Downloaded 10 times
Erich Schulz
Posts: 141
Joined: Tue May 07, 2019 10:50 pm
Location: Brisbane, Australia

Re: noob surface contour question

Postby Erich Schulz » Tue Jun 04, 2019 7:48 am

oh wait I see I need to enable experimental features... I'll do that now

am I ok on 0.18 or do I need to install 0.19?
RatonLaveur
Posts: 339
Joined: Wed Mar 27, 2019 10:45 am

Re: noob surface contour question

Postby RatonLaveur » Tue Jun 04, 2019 8:10 am

Hi,

0.18 is fine. but I don't see why you would need experimental features for just a contour. The PathWB already has good vanilla contouring option.

Please follow https://www.youtube.com/playlist?list=P ... t7MLdCO3io this topic to guide you in your first steps. It will avoid many hours of head-scratching and questions.

J.
Erich Schulz
Posts: 141
Joined: Tue May 07, 2019 10:50 pm
Location: Brisbane, Australia

Re: noob surface contour question

Postby Erich Schulz » Tue Jun 04, 2019 12:07 pm

Thanks for the suggestion. They are helpful but don't address my issue of cutting the surface feature.

I think I am needing to use this feature to follow complex topology https://www.freecadweb.org/wiki/Path_3DSurface
RatonLaveur
Posts: 339
Joined: Wed Mar 27, 2019 10:45 am

Re: noob surface contour question

Postby RatonLaveur » Tue Jun 04, 2019 12:49 pm

The ideal way is in deed to use actual 3D surface methods as described in several topics here, but this can of worms entails:

- Installing OpenCamLib dependencies (easy if you're on a windows machine) tougher on Linux but there is a topic for that.
- Experimenting with the newer codes such as Waterline Milling.

If I am not mistaken, 3D pocket is the best way to cheaply prototype your part, as demonstrated in the pictures below. Would that suffice?
3D pocket should already exist in your version, and be ready for use.
Attachments
3DPocket_Coarse.png
3DPocket_Coarse.png (27.38 KiB) Viewed 171 times
3DPocket_Fine.png
3DPocket_Fine.png (27.29 KiB) Viewed 171 times
herbk
Posts: 1531
Joined: Mon Nov 03, 2014 3:45 pm
Location: Windsbach, Bavarya (Germany)

Re: noob surface contour question

Postby herbk » Tue Jun 04, 2019 1:01 pm

Hi Erich,
yes, if you want to use 3D Surface you have to install OCL (what's not easy atm) and enable the experimantal features.

A workaround what i'm using for parts like yours: I add a helper pad to the bottom of the part and use 3D Pocket, wich works without OCL. With litlle step down steps the surface of champfers is not to bad, but it needs a lot of milling time.
test.jpg
test.jpg (90.16 KiB) Viewed 164 times
Attachments
test_herbk.FCStd
(126.67 KiB) Downloaded 5 times
Gruß Herbert
Erich Schulz
Posts: 141
Joined: Tue May 07, 2019 10:50 pm
Location: Brisbane, Australia

Re: noob surface contour question

Postby Erich Schulz » Tue Jun 04, 2019 9:15 pm

Ahhh thanks.

I now have a wiki account so I can make some edits.

I wonder if ocl is being used in the new 4th axis code? (This is my real goal)

I'll do some more reading...