Re: freqmod step clock instability

["patrick mendiuk" <patman-at-home.com>]

Ray
I will make a test plan and run a complete set of benchmarks. To be really
complete, I would like to correlate some of the realtime NML variables to
the tests as well, but I haven't been able to compile the stripchart from
within the BDI installation.  If I can get the stripchart or some other
method to record the NML variables I'll combine all the data together.

Patrick



>
>On Wed, 08 Aug 2001, Patrick wrote:
>> I'm using freqmod at 20k steps per inch, at various speeds up to 40
in/min.
>
>Patrick
>
>First thing I'd do is try reducing steps per inch to something around 4-5
k.
>That should give the average user about 1/4 of a tenth accuracy.  See how
>well the frequency generator software does at that.
>
>Reducing the max_velocity will also change the equasion some I
>think.
>
>Just an idea here but since you have the equipment to measure these things,
>how about setting up a test schedule and running various period parameter
>settings, various steps per inch settings, various max_velocity, and
various
>speeds.  This would at least give us some benchmark of performance.
>
>Then if you write html, we could put the results up on linuxcnc.org.  Or
>write it as text and graphics and I can convert it here.  Or send results
>and we'll find someone to write it up.
>
>"If you choose to accept this mission... This message will self descruct in
>five seconds!"  Hey, you don't ask, you don't get.<g>
>
>Ray
>
>