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by berka
Sun Nov 26, 2017 10:18 pm
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Re: Vertical Feed rates in partially-vertical cuts

chrisb wrote:
Sun Nov 26, 2017 10:40 am
It looks intriguing, however, it leads to speeds which are too high:
I was suspicious I forgot a ^2 or sqrt somewhere...
Unfortunately, I'm having a total trigonometric blackout moment right now, and I can't see it!!!
I will think about it some more...
by berka
Sun Nov 26, 2017 12:29 am
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Re: Vertical Feed rates in partially-vertical cuts

The thoughts hold only for G1 commands. I have exactly the same issue with arcs too. E.g. helix drills are feeding too slowly. This makes me think may be it should be possible to override feed rate as someone else pointed out. I just don't know how that could be done. On the helix drill example, ea...
by berka
Sun Nov 26, 2017 12:14 am
Forum: Path/CAM
Topic: Can't edit TagDressup
Replies: 8
Views: 955

Re: Can't edit TagDressup

Thanks. Autogenerate works now. I didn't try the manual add/removes; I didn't have to. :-)
by berka
Sun Nov 26, 2017 12:13 am
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Re: Vertical Feed rates in partially-vertical cuts

In fact the length of the ramp is sqrt(x^2 + Y^2 + Z^2) and the horizontal distance is sqrt (x^2+y^2). I have omitted this because I had the feeling it rather obstructs things than clarifying. Should I add to the paper? Keep in mind also the possibility of an arc. I think what you're dealing with h...
by berka
Sun Nov 26, 2017 12:01 am
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Re: Vertical Feed rates in partially-vertical cuts

Referring to your PDF drawings,
How about:
Vl = fx * Vx + fz * Vz
Where fx = X/L and fz = Z/L
This would eliminate the conditionals you deal with while deciding whether it is a steep or shallow ramp.
In the ramp extremes it degenerates to Vl = Vx or Vl = Vz.
by berka
Sat Nov 25, 2017 5:16 pm
Forum: Path/CAM
Topic: Toolcontroller GUI Bug
Replies: 20
Views: 1465

Re: Toolcontroller GUI Bug

PR says merged 3 days ago, but I'm still seeing the behavior on a dev download from today: OS: Mac OS X Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.12645 (Git) Build type: Release Branch: (HEAD detached at 447d481) Hash: 447d4816ce1cd6b2adda8055aef502fac8401249 Python version:...
by berka
Sat Nov 25, 2017 4:31 pm
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Re: Vertical Feed rates in partially-vertical cuts

it should use the lower of both I disagree, but I'm not a machinist; I'd love to hear from an ME and a machinist. What this means to me is that I have to "fake" my plunge rates to get reasonable feed rates on this operation. Look at this snippet from earlier: G1 F5.000000 X-10.000000 Y11.587500 Z-1...
by berka
Fri Nov 24, 2017 9:29 pm
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 3739

Vertical Feed rates in partially-vertical cuts

This behavior surprised me a little, so I thought it may be up for discussion. I feel like feed rate should consider both vertical and horizontal rates when making a move that's a ramp. Currently I see that the G-code generated picks one or the other feed rate rigidly. A simplified example situation...
by berka
Tue Nov 21, 2017 12:40 pm
Forum: Developers corner
Topic: Diffing through .fcstd files
Replies: 23
Views: 3568

Re: Diffing through .fcstd files

I did some digging in the source. It looks like stuff in Document.xml is ordered alphabetically, but GuiDocument.xml is where the problem is. I can now see that in my results as well. The culprit in the source at FreeCAD/src/Gui/Document.cpp: https://github.com/FreeCAD/FreeCAD/blob/99a2fd16f47f11c1e...
by berka
Sun Nov 19, 2017 1:41 am
Forum: Path/CAM
Topic: PathShape is not member of Job Operations (bug?)
Replies: 12
Views: 1111

Re: PathShape is not member of Job Operations (bug?)

mlampert wrote:
Sun Nov 19, 2017 12:39 am
What are you using?
I use bCNC too. Our posts crossed; see my last post.

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