3D Surface toolpath doesn't cut to edges of workpiece

[Steveco]

I am able to generate a toolpath with the 3D Surface operation. But it doesn't cut to the edges, or over the curve at the right end of the model.

HoleGuideTest_3_Toolpath_ScreenShot.png (10.37 KiB) Viewed 800 times

If I cut this with a ball-end mill, there will be raised areas along the edges of the part. I need the toolpath to extend to the edges of the part body, or even beyond.

I tried making the stock bigger and setting Bound Box to Stock, but that had no effect. What else can I try?

My file:

HoleGuideTest_3.FCStd

(36.31 KiB) Downloaded 30 times

OS: Ubuntu 16.04.6 LTS (Trinity/trinity)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.22474 (Git) AppImage
Build type: Release
Branch: master
Hash: a44f8ffd427fa9b23b1f00dbf62d66cd152cd774
Python version: 3.8.5
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United States (en_US)

Thanks,
Steve

[chrisb]

You could
- set BoundaryEnforcement=False
- add a helper pad under your object

[chrisb]

This is the best I could achieve. It uses BoundaryEnforcement=False and a BoundaryDressup, in case you don't want to mill over the plane face. You may also add another operation with the cut pattern turned by 90°.

Snip macro screenshot-c93d88.png (7.34 KiB) Viewed 777 times

[GeneFC]

Seemed to work for me by setting Use Boundary Enforcement to "False".

Capture.PNG (49.63 KiB) Viewed 727 times

OS: Windows 7 SP 1 (6.1)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.22492 (Git)
Build type: Release
Branch: master
Hash: 621e1d603b2a8d1bcdcd8dc5c34bc8c35d29feb2
Python version: 3.8.5
Qt version: 5.12.6
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United States (en_US)

Gene

[Steveco]

Thanks to you both! I had not heard of Boundary Enforcement. After I found it in the Data tab, I found Boundary Adjustment right above it. Leaving Boundary Enforcement = true and setting Boundary Adjustment to 6.35mm (1/2 the end mill diameter) produced exactly the result I need.

HoleGuideTest_4_Toolpath_ScreenShot.png (17.78 KiB) Viewed 696 times

HoleGuideTest_4.FCStd

(37.46 KiB) Downloaded 44 times