you can really see it if you slow down the acceleration to 1in/sec^2

sam
On 12/16/2013 10:34 AM, sam sokolik wrote:
> This program (which should be tangent arcs) seems to slow down to a stop
> at the beginning of the first and last arc.
>
> %
> (1" square with rounded corners)
> G90 G54 G20
> G64
> G0 X0 Y.25 Z0
> G1 Y.75 F50
> G2 X.25 Y1 I.25
> G1 X.75
> G2 X1 Y.75 J-.25
> G1 Y.25
> G2 X.75 Y0 I-.25
> G1 X.25
> G2 X0 Y.25 J.25
> M30
>
>
>
> On 12/15/2013 9:40 PM, sam sokolik wrote:
>> Arcspiral.ngc now runs at a peak of 400+ipm - only switches to parabolic
>> blends at the very end of the program (probably where the arcs are not
>> 'tangent' enough).  Awesome!
>>
>> steve.ngc runs in 7 seconds and seems to slow down down in 2 spots
>> (switches to parabolic blends..)  Awesome! :)
>>
>> stellabee1 runs a lot faster but..  When running G64P.005 - I get a
>> overage around line 44545.
>>
>> Here is a short example that shows the errror  - if you run the program
>> farther - it will have a hand full more of these.  says line 23
>>
>> http://imagebin.org/282452
>>
>> G20
>> G0 Z0.0120
>> G17 G40
>> G80 G90 G94
>> S1000 M3
>> (G04 P3)
>> G64P.005
>> F999.0000
>> G18
>> F999.0000
>> G0 X3.0560 Z-0.1065
>>     X3.0660 Z-0.0958
>> G2 X3.0800 Y3.3700 Z-0.0853 I-0.0126 K0.0314
>> G1 X3.0940 Z-0.0824
>>     X3.1040 Z-0.0889
>> G3 X3.1160 Y3.3700 Z-0.0814 I0.0122 K-0.0061
>> G1 X3.1220 Z-0.0830
>>     X3.1260 Z-0.0824
>>     X3.1340 Z-0.0735
>>     X3.1380 Z-0.0745
>>     X3.1420 Z-0.0791
>>     X3.1500 Z-0.0941
>>     X3.1600 Z-0.1020
>>     X3.1660 Z-0.0990
>>     X3.1740 Z-0.1000
>> G3 X3.1880 Y3.3700 Z-0.0922 I0.0188 K-0.0172
>> G3 X3.1960 Y3.3700 Z-0.0736 I0.0697 K-0.0189
>> G1 X3.1980 Z-0.0706
>> M2
>>
>> Great work!!
>> sam
>>
>>
>>
>>
>>
>> On 12/15/2013 03:37 PM, Robert Ellenberg wrote:
>>> I think I fixed the issue in the latest commit. It turned out that I wasn't
>>> checking the type of segment properly in an error check, so it would flag
>>> some arcs as not tangent even when they were. Along with some other fixes
>>> to get acceleration right, it should be running at nearly full speed now.
>>>
>>> Since my last push, I also added a few optimization fixes that should run
>>> code like stellabee a bit faster. In particular transitions from tangent to
>>> parabolic blending in some cases forced two unnecessary exact stops, which
>>> caused more ripple and slowdown than would otherwise be expected.
>>>
>>> I also ran the 3D chips code on my Sherline, off of an Atom CPU. I didn't
>>> see any RT interruptions even with the base thread running. My plan for
>>> testing next is to set up a version of the test config with a base thread,
>>> and spoof an e-stop. This way, the parallel port can be disconnected to do
>>> build tests.
>>>
>>> -Rob
>>>
>>>
>>> On Fri, Dec 13, 2013 at 2:44 PM, sam sokolik <sa...@empirescreen.com> wrote:
>>>
>>>> I forgot to say - I just pulled your latest changes before testing...
>>>>
>>>> sam
>>>> On 12/13/2013 1:37 PM, Robert Ellenberg wrote:
>>>>> Can you send a link to that G code? I'd like to run it myself and see if
>>>> I
>>>>> can pinpoint the slowdown. I've identified and fixed a bunch of little
>>>>> slowdowns over the last week, so the problem may already be solved.
>>>>>
>>>>> Thanks!
>>>>> Rob
>>>>>
>>>>>
>>>>> On Fri, Dec 13, 2013 at 2:00 PM, sam sokolik <sa...@empirescreen.com>
>>>> wrote:
>>>>>> Couple of things.
>>>>>>
>>>>>> arc-arc blends are slower than current TP...  current tp does arcspiral
>>>>>> at a peak of 100ipm while the new TP does it at about 70.
>>>>>> So current TP http://imagebin.org/282155 1:19 minutes
>>>>>> New TP http://imagebin.org/282156 1:51 (you can see it does parabolic
>>>>>> blends)
>>>>>>
>>>>>> The neat thing is..  If you do a G64P.003 the naive cam detector
>>>>>> converts the short arcs to line segments and you get...
>>>>>>
>>>>>> http://imagebin.org/282156  21 seconds
>>>>>>
>>>>>> that peaks at almost 400ipm
>>>>>>
>>>>>> sam
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On 12/12/2013 2:49 PM, Robert Ellenberg wrote:
>>>>>>> I agree with Sam that we're ready for testing from other users.
>>>> However,
>>>>>>> there are a few features that we may want to add before a merged into a
>>>>>>> main build. One limitation now is that there are a bunch of
>>>> configuration
>>>>>>> variables that are hard coded:
>>>>>>>
>>>>>>>         - Optimization depth (currently set to ~40 segments)
>>>>>>>         - Enable / disable arc blend flag
>>>>>>>         - Max feed override (for sizing blend arcs, assumed to be 200%)
>>>>>>>
>>>>>>> Given these extra settings, I'm curious what the best way is get them
>>>>>> from
>>>>>>> an INI file to the trajectory planner. For the experts, how are INI
>>>>>>> settings propagated into motion currently? Is there an easy way to tack
>>>>>> on
>>>>>>> a few more config options?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Rob
>>>>>>>
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