Freecad path strategy

[chrisb]

To demonstrate my idea from above: Here I have added a pad which has just the length of the door. It will not protude, but it will create a seam.

Spiral avoids the rats nest.

I have to correct myself: There come two possibilities to mind how this could be possible in Path workbench:
1) You could use a custom stock
2) you could use a boundary dressup.

SnipScreenshot-5cfdd7.png (48.38 KiB) Viewed 935 times

[herbk]

Hi,
i would also ad a little pad to the model for the handle and use the same workflow like Chris at general...

@ Chrisb: My AppImage freezes if i change the Step Over to something less then 100% Doing this is a need, because 100% leaves always unwanted islands.
Would you check you get this freezing to?

Usualy i prefer Adaptive for pocket operations, but there is also a problem atm, - here it cuts to much and damages the model.

wichteltuer.png (14.48 KiB) Viewed 931 times

OS: openSUSE Tumbleweed (KDE//usr/share/xsessions/plasma5)
Word size of FreeCAD: 64-bit
Version: 0.20.27008 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 9162733)
Hash: 91627338a44371fe9a8e815b4900f62558af98a1
Python version: 3.9.9
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.3
Locale: German/Germany (de_DE)

[chrisb]

Moved to Path forum.

[chrisb]

@ Chrisb: My AppImage freezes if i change the Step Over to something less then 100% Doing this is a need, because 100% leaves always unwanted islands.
Would you check you get this freezing to?

The pocket from my last model uses 95% stepover.

[chrisb]

@ Chrisb: My AppImage freezes if i change the Step Over to something less then 100% Doing this is a need, because 100% leaves always unwanted islands.
Would you check you get this freezing to?

No problem with adaptive either. However, I was not able to change it to 80 in the Adaptive's dialog, it always was reset to 20. But I could change it directly in the properties.

[chrisb]

Very cumbersome: I have set adaptive stepover to 80 in the properties. If I edit it, it shows 75 in the dialog. Even if I confirm the 75 I still have 80 in the properties.

Edit: The dialog is smart and realizes, that no input was made. If I change to 74, change it back to 75 and confirm, then I see 75 in the properties.

Edit 2: There is a limit of 75 in the dialog. I had typed 80 and probably didn't realize that it was not accepted.

[Russ4262]

...
Usualy i prefer Adaptive for pocket operations, but there is also a problem atm, - here it cuts to much and damages the model.
wichteltuer.png
...

Morning Gentlemen.
@HerbK, that Adaptive artifact can be eliminated by increasing the "Stock to Leave" value to something greater than zero. In the attached example, I set it to 0,50 mm and disabled the "Finishing Profile" because I would add a finishing pass using the Profile op to clean up the perimeter of the pocket after the Adaptive op clears it. This solution to the Adaptive artifacts is posted in another thread here in the forum, Re: Ticket #4658 - Pocket clearing struggle.


You all are such a great support group for forum users!

Russell

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.27078 +5 (Git)
Build type: Release
Branch: feature/cut_pattern_upgrade
Hash: 0d44bdc9644be09f4e9ab45eba5e32745b552ae6
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.3
Locale: English/United States (en_US)

[GeneFC]

Is there a possibility to have an "island" in the middle of the pocket?

I'm afraid not directly, perhaps Gene or Herbert know of a possibility in Path. I would add something faky to the model to get an additional seam.

pinged by pinger macro

I may not understand the problem. I have left islands in pockets for years. I just tried with the original file posted above. I removed the "bridge", leaving the island free inside the pocket, and there was no problem in creating a correct pattern. I added the keyhole as a separate face, and again everything worked fine.

Of course the issue of efficiency of using large and small cutters was not addressed in this simple test.

OS: Windows 7 Version 6.1 (Build 7601: SP 1)
Word size of FreeCAD: 64-bit
Version: 0.20.26858 (Git)
Build type: Release
Branch: master
Hash: e209bc706d35121098f9bac779bc6b09c24ddd95
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.3
Locale: English/United States (en_US)

Gene

[herbk]

@ Chrisb: My AppImage freezes if i change the Step Over to something less then 100% Doing this is a need, because 100% leaves always unwanted islands.
Would you check you get this freezing to?

The pocket from my last model uses 95% stepover.

My foult, sorry... The problem is only if i use Cut Pattern Spiral ! The time for calculate the path increases if i go down with the Step Over %.
ATM it calculates at 50% more then 10 minutes now, but system monitor shows processor load at about 15% only.

[chrisb]

My foult, sorry... The problem is only if i use Cut Pattern Spiral ! The time for calculate the path increases if i go down with the Step Over %.
ATM it calculates at 50% more then 10 minutes now, but system monitor shows processor load at about 15% only.

Ah, I wondered already why it became so slow. So yes, I can confirm your observation. Usually I use Offset, but as described above, I wanted to avoid the "rats nest".