Milling an area with open edges

[MPC]

Hi,

Sorry I posted this on the general freecad help but its more a PATH related.

Any ideas how to mill out an open edge area?

I have tried several different attempts but I have completely failed. Any suggestions?

Kind Regards,

MPC

Screenshot from 2021-06-09 15-40-50.png (234.94 KiB) Viewed 2968 times

[chrisb]

I removed the duplicate from the help forum.

[Paula]

I'm not a professional machinist so I might be wrong but I think you're supposed to mill the face before performing the pocketing.

[chrisb]

Any ideas how to mill out an open edge area?

Use a pocket and check the appropriate edge in the Extensions tab.

[Russ4262]

... Any ideas how to mill out an open edge area? ...

As ChrisB suggested, and MLampert encourages, use the Extensions feature of the regular Pocket operation to extend edges, expanding access to such regions. See the last image.

EDIT: A second option is to select both the upper open edge face and the inner lower and clear them together at the upper face depth, then do a second clearing op with only the inner lower selected. See second and first image.

BR,
Russell

OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24276 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: a88db11e0a908f6e38f92bfc5187b13ebe470438
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)

[MPC]

Hi,

Thanks for the suggestions.

Unfortunately it still fails.
Below is the pocket with the wire extension checked and Extend corner checked. You can see the cutter is driven into the part.

Extended Corners.png (12.01 KiB) Viewed 2801 times

Below is the Extend Corners unchecked but all edges checked

All edges selected.png (8.22 KiB) Viewed 2801 times

Below is the Extended Corners unchecked but only partial edges selected.

Partial edges selected.png (11.13 KiB) Viewed 2801 times

This is from a different body where I used Mill Face with Boundary Shape set to 'Face Region' and this successfully extended beyond the open edges. This does not work with the fillet part though.

MillFace Different Part.png (74.83 KiB) Viewed 2801 times

I get this error message when I try Mill Face with Boundary Shape set to 'Face Region' on the Fillets.

Error Message.png (120 KiB) Viewed 2801 times

Could it be that the fillets were done in Part Design and not done as part of the sketch?


Any more thoughts?

Kind Regards,

MPC

[chrisb]

Could it be that the fillets were done in Part Design and not done as part of the sketch?

I don't think that Path workbench cares about how an object was built, but running CheckGeometry with BOPCheck enabled is probably a good idea.

[MPC]

Thanks chrisb,

I tried your suggestion but I got no errors.

Check Geometry.png (104.27 KiB) Viewed 2765 times

OS: Ubuntu 20.04.2 LTS (ubuntu:GNOME/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 0.19.2)
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.8
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United Kingdom (en_GB)

[chrisb]

Preliminary remark: The PartDesign features have a Refine property which make the separate object obsolete.

Concerning the rounded corner: In the attached example I used a profile of the to face and changed the depth appropriately. Then I added a boundary dressup. It's not exactly what you want, because it creates additional paths, but it does at least do the job in an automated way.

SnipScreenshot-b44d08.png (6.03 KiB) Viewed 2738 times

[MPC]

Thanks chrisb,

That's a very useful suggestion.

I did a bit more experimenting and found something very interesting.

I built a cube with a pocket and fillet edges.

1. I did the fillet using sketch --- Mill face worked and extended correctly

2. I did the fillet using part design. --- Mill Face failed with error --> 19Standard_OutOfRange NCollection_Sequence::Value19Standard_OutOfRange NCollection_Sequence::ValueSomething unexpected happened. Check project and tool config.

Below is the working mill face

MillFace using sketch for fillet.png (81.77 KiB) Viewed 2652 times

Is this worth raising as a bug?

Kind Regards,

MPC