Path process/bugs

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cahlfors
Posts: 91
Joined: Tue Jan 24, 2012 8:27 pm
Location: Sweden

Path process/bugs

Post by cahlfors »

Hello forum!
I am trying to mill the following object:
Markering_014.png
Markering_014.png (3.97 KiB) Viewed 1257 times
What's the intended strategy to do this?
  • 1 Face mill the upper step and then
  • 2 face mill the lower step, or
  • 3 pocket mill the lower step, or
  • 4 something else?
No matter how I try this, there will be artifacts which I would like to report. But first, I want to be sure to use the intended procedure, so can you pls help me with this?

Thanks, /Chris

OS: Linux Mint 18 Sarah
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.12222 (Git)
Build type: None
Branch: master
Hash: 9d7240f695edeb236147d0800ae8dbd9643327e6
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.1.0
Locale: Swedish/Sweden (sv_SE)
electrical engineer
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chrisb
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Joined: Tue Mar 17, 2015 9:14 am

Re: Path process/bugs

Post by chrisb »

Could you please attach your file so we can see what you have done?
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cahlfors
Posts: 91
Joined: Tue Jan 24, 2012 8:27 pm
Location: Sweden

Re: Path process/bugs

Post by cahlfors »

Here it is
Attachments
Z.fcstd
(34.75 KiB) Downloaded 24 times
electrical engineer
Ubuntu or Mint
Mendel 3d-printer/OctoPrint
LinuxCNC
Optimum BF20L mill
chrisb
Veteran
Posts: 53920
Joined: Tue Mar 17, 2015 9:14 am

Re: Path process/bugs

Post by chrisb »

It seems that you did not select the faces which you want to mill. It works perfect here:
Bildschirmfoto 2017-10-01 um 00.56.55.png
Bildschirmfoto 2017-10-01 um 00.56.55.png (23.25 KiB) Viewed 1197 times
OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.12222 (Git)
Build type: Release
Branch: (detached from 9d7240f)
Hash: 9d7240f695edeb236147d0800ae8dbd9643327e6
Python version: 2.7.14
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.1.0
Locale: German/Germany (de_DE)
Attachments
Z_cb.FCStd
(25.27 KiB) Downloaded 22 times
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
cahlfors
Posts: 91
Joined: Tue Jan 24, 2012 8:27 pm
Location: Sweden

Re: Path process/bugs

Post by cahlfors »

Thanks for reaching out! :)

I was planning to use the facing operation (50mm face mill) and there you can select the entire part. Pockets have the disadvantage of creating artifacts in the corners. Ideally, the part should not require cutting, filing etc. postprocessing.
electrical engineer
Ubuntu or Mint
Mendel 3d-printer/OctoPrint
LinuxCNC
Optimum BF20L mill
chrisb
Veteran
Posts: 53920
Joined: Tue Mar 17, 2015 9:14 am

Re: Path process/bugs

Post by chrisb »

You are not talking about artefacts in the path object but about the left overs not getting milled due to radius compensation? On the top surface this is of course no problem, on the lower surface it could be handled with a dogbone dressup. However, I could not get them working.
@mlampert: Is there currently a problem with the dressups? I havent heard something for a long time about them so they might have been forgotten with all the nice reworking you did.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
cahlfors
Posts: 91
Joined: Tue Jan 24, 2012 8:27 pm
Location: Sweden

Re: Path process/bugs

Post by cahlfors »

chrisb wrote: Mon Oct 02, 2017 9:27 pm You are not talking about artefacts in the path object but about the left overs not getting milled due to radius compensation?
I mean the leftovers in the corners that are not getting milled because of the radius of the tool, which is just touching the outer boundary instead of milling clear, which makes sense when milling a fully enclosed pocket. Not sure if that is the same as radius compensation. I never understood the concept and have just learned to ignore it.
Now, I am not an advanced user and my lack of experience is why I am asking for advice first.

I have seen Sliptonic's video tutorial on dogbone dressups and I see what you mean. That should work, but means manual "intervention". Creating a helper object as I have done is another manual intervention to solve the problem.
Markering_015.png
Markering_015.png (12.11 KiB) Viewed 1118 times
Attachments
Z.fcstd
(34.53 KiB) Downloaded 20 times
electrical engineer
Ubuntu or Mint
Mendel 3d-printer/OctoPrint
LinuxCNC
Optimum BF20L mill
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