Can't engrave text!

[falviani]

Hi all,

My set up is:
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.17337 (Git)
Build type: Release
Branch: master
Hash: 0871fb49c71f1ac4029e441814332368f42bd78a
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)

I have attached a very small file where I have a shape string I wish to engrave, using a mill face operation to try and remove all the material within the character outlines. Currently I have an engraving tool selected. The font is a san serif with uniform line thickness. The text is not that small, and no matter what cutting pattern or tool I choose, the simulation shows that it is only sporadically cut. I'm getting very bewildered trying to understand the complete failure of this operation. Where can I get more information on how the cutting algorithms work (without reading the python source ) Or, can someone explain what's happening, and what I can do instead?

Thanks in advance - Frank

[herbk]

Hi Frank

your letters are pockets, so if you use the pocket OP it works.

Edit: The "S" don't work, i can't figure out why atm...

Edit edit: If i use "Profile by Edges" i got a path for the "S" to, but it should work with Poket op to.

[falviani]

I'm sorry, but it's not at all accurate. Below is the result of running the simulation (as you can see, much is missing) :

TestOneSimulation1.png (58.97 KiB) Viewed 1009 times

[herbk]

??
here it works with FC 0.18.2 edit: not with 0.19

test_one.jpg (51.31 KiB) Viewed 1005 times

[Russ4262]

Afternoon, Gentlemen.
I can verify the problem with PathPocketShape. I downloaded falviani's file in the OP.

The 'S' will not produce a path using PocketShape. I attempted it within a grouped Base Geometry operation and a operation where the 'S' face is the only Base Geometry. PathPocketShape is quite slow now, compared to earlier FC 0.19 releases around the 16700 minor range.

I also noticed the Apply/change-setting relationship in the task window editor is not working correctly.
Steps to reproduce:

1. Select faces for the 'T' and 'E'.
2. Create the PocketShape icon and click 'OK' with no changes.
3. Double click the new Pocket_Shape operation to edit.
4. The 'Apply' button is inactive. (Normal behavior)
5. Change the Step Over Percent and the Pattern.
6. The 'Apply' button remains inactive. (Problematic behavior)

Russ

OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.17352 (Git)
Build type: Release
Branch: master
Hash: ec0049921b813ee78c1fd4ea304e70904a3208f7
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)

[falviani]

Thanks for the update. I downloaded version 352 and tried the simulation again, with unchanged results. My expectations were that the end result would match the pocket. I deliberately made it quite shallow so that the significant taper in the tool profile would (hopefully) result in a very small allowance for the tool radius. Perhaps the code can't handle a tapered tool and just assumes the diameter in the controller (which in this case is 3mm)? If so, I would consider that a bug.

If I substitute a 1mm endmill for the engraver, I get the expected results.

Again, thanks - Frank

[chrisb]

If I try to edit the tool Engraver1 with a double click, FreeCAD crashes. Can somebody confirm?

OS: macOS High Sierra (10.13)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.17360 (Git)
Build type: Release
Branch: master
Hash: 348160d4ea970f5f6d0850272c04800c0222c8ba
Python version: 3.7.3
Qt version: 5.9.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Germany (en_DE)

[chrisb]

The missing path seems to come from too big a tool:

Tool diameter 2.81:

Bildschirmfoto 2019-07-18 um 02.12.47.png (10.98 KiB) Viewed 973 times

.

Tool diameter 2.82:

Bildschirmfoto 2019-07-18 um 02.15.16.png (13.28 KiB) Viewed 973 times

[herbk]

The missing path seems to come from too big a tool:

Not realy... If i use FC 0.18.2 from OpenSuse Repo, the 2mm tool and try to create a path with "Pocket OP" it don't work. Profile on face and Profile at edges works.

If i do the same with the latest 0.19 AppImage FC crashes if i try to get a path for the S. - on each OP...

The crash at doubleclicking the engraver to edit i don't have at both.

[chrisb]

Thanks for reporting back. I will try some comparisons of 0.18 and 0.19.