----- Original Message ----- 
From: "Mark Wendt" <wendt.m...@gmail.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Tuesday, February 25, 2014 12:16 PM
Subject: Re: [Emc-users] Fun with trajectory planners and Halscope


> On Mon, Feb 24, 2014 at 11:03 PM, sam sokolik 
> <sa...@empirescreen.com>wrote:
>
>> I am surprised people still put up with me...  I do have a lot of help
>> from the community.  The compact 5 configs using the latch and dual
>> stepgens would not have been possible if not for Jeff and Chris's
>> smarts..  (I am the big picture guy usually...)
>>
>> As far as machs acceleration violations.  I am pretty confident that
>> they are real.  (again unless I am doing something wrong)  If you want
>> to see some huge violations - run the tort.ngc program.  It has lots of
>> diabolical motion.  (granted - it is diabolical) I think though you
>> should be able to throw  any gcode to a control and is should process it
>> correctly.
>>
>> g21
>> G0 X0 Y0 Z20
>> G0 X5.394910 Y13.495489 Z20.332291
>> G19 G2 F500 (225 29) J5.656854 K5.656854 X10.394910 Y26.080547 Z29.989145
>> G19 G2 (75 14) J-0.258819 K-0.965926 X6.894910 Y26.787653 Z29.282038
>> G17 G2 (329 285) I-4.330127 J2.500000 X3.858878 Y24.458024 Z31.282038
>> G0 X0 Y0 Z20
>> m30
>>
>> when run through mach and logged shows this
>>
>> http://electronicsam.com/images/KandT/testing/MachViol.png
>>
>> that is 100 in/s^2 when it should be obeying 30.
>>
>> This is what it looks like
>>
>> http://electronicsam.com/images/KandT/testing/MachViol1.png
>>
>> sam
>>
>
> Sam,
>
> How are you getting LinuxCNC to monitor and log Mach's processes?
>

Sam explained that in his first email:

There's a second LinuxCNC machine with a 7i80 attached 
(http://www.mesanet.com/pdf/parallel/7i80dbman.pdf) - the 7i80 is a FPGA 
card with ethernet connection to LinuxCNC.
The 7i80 has encoder counters set up to read/count step/dir signals.

The Mach PC (or LinuxCNC PC1) outputs step/dir which are connected to the 
encoder counters on the 7i80 and end up to LinuxCNC2. Quite a brilliant 
idea/setup.
Since it's hardware counters on the 7i80, you can trust them pretty much.

Regards,
Alex


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