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by berka
Tue Dec 05, 2017 11:13 am
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 4331

Re: Vertical Feed rates in partially-vertical cuts

I'm back now; it's been a rough couple of weeks... I am not sure about the objective of your approach. If it is maximizing speed - as OP's issue was all about - or is it kind of smoothness or something else. My attempt was at consistency. Think about the X-Y plane. On that plane, you're cutting with...
by berka
Sun Dec 03, 2017 12:30 am
Forum: Developers corner
Topic: Diffing through .fcstd files
Replies: 23
Views: 3856

Re: Diffing through .fcstd files

It's super easy to make a PR :lol: Thanks. I'm sure it is. I looked up what it takes to sort a an std::map before I posted. They lost me at "functor." I'm not a SW guy; I just dabble. FreeCAD version is out of date, a bug fix release of 0.16 was released I'm guessing that's the "backport" release. ...
by berka
Mon Nov 27, 2017 4:58 am
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 4331

Re: Vertical Feed rates in partially-vertical cuts

Helix ramping is now included in the pdf on the first page of this topic . I'm happy to hear you're considering helix as well; I think it's the same in this context when unwrapped as you pointed out. Back to the math. Here is what I had in mind. in terms of finding a feed rate for a ramp: RampFeedP...
by berka
Sun Nov 26, 2017 10:18 pm
Forum: Path/CAM
Topic: Vertical Feed rates in partially-vertical cuts
Replies: 55
Views: 4331

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: 4331

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: 1047

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: 4331

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: 4331

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: 1661

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: 4331

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...

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