On Monday 04 November 2013 03:46:11 Robert Ellenberg did opine:
> Hi All,
>
> I've completed a beta version of circular arc blending, which looks
> pretty promising! Here's a performance comparison between the stock
> blends and circular arc blends:
>
> http://www.youtube.com/playlist?list=PLTi4ghj9Dyajbv4F4P4TxWXpgPgvqrhA-
>
> For a random, kinky path with short segments, the difference is pretty
> dramatic. The average speed is about 3ipm with stock blends, vs. 7 ipm
> with circular arc blends.
>
> Here's the branch on github:
>
> https://github.com/robEllenberg/linuxcnc-mirror/tree/feature/3d-blend-ar
> c-techdemo
>
> The algorithm itself is working, so I'd like to make sure the
> implementation is robust too:
>
> - Edge cases and checks such as minimum / maximum blend radius
> - Eliminate any conflicts with other machine modes (haven't found any
> yet, but I wouldn't be surprised if there were).
> - How much difference does optimization depth make? Depending on
> machine config, much more than 10 segments might not matter
> - Parameters stored in INI file and passed in via commands
> - Profiling / RT timing performance, especially on slower machines
> (tpAddLine has a lot more work to do now)
>
> If you have ideas for additional features or tweaks, or would like to do
> some testing, definitely let me know. In particular, I'm looking for
> feedback on the following areas in simulation and/or hardware:
>
> - Are synchronized motions (CSS, rigid tapping) adversely affected by
> my changes? I don't have a spindle pickup on the sherline, so this
> would be very helpful to test this on a machine so equipped.
> - Position accuracy at high speed, perhaps a comparison of G2/G3 arc
> vs. a circle made of line segments.
> - Profiling / timing performance on a real machine (simulation
> profile results show no more than a few percent difference, but I'm not
> sure how representative that is of hardware conditions)
> - Qualitative performance on high-acceleration machines. Can the
> machine hit speeds so that trapezoidal profiles aren't smooth enough?
>
> So far I've tested 3D motion, but it should be able to handle motion in
> all 9 axes (by falling back to parabolic blends). I'd recommend running
> your programs in simulation mode first just in case.
>
> -Rob
Thats pretty impressive Rob.
Cheers, Gene
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