On Thu, 14 Nov 2013, Maximiliano Fermín Córdoba wrote:
Date: Thu, 14 Nov 2013 13:36:08 -0200
From: "[ISO-8859-1] Maximiliano Fermín Córdoba" <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] beaglebone black capeless CNC configuration
Hi Michael
Yes... Im running gcode operations manually... I mean g1x0f1000 or g1x100
and so on.
I thought that the setting in the .ini file will change the characteristics
of the steps generated. So if I set the steplen to be 1000 nanoseconds...
Then the steps generated will be like that.
Besides ... I realized that the jitter is present above 20khz.
Thanks again for trying to help me
Maxi
Any DDS type stepgenerator will exhibit jitter at step rates that dont set
the rate value to an exact submultiple of the accumulator count range.
This size of this jitter will be the inverse of the accumulation rate (in the
order of 10s of uSec for linuxCNCs software stepgen basethread , probably in
the 1 to couple of uSec region for the PRU and the 10s of nS region for
hardware stepgens)
In addition to this, the servo thread jitter will add velocity modulation to
the step rate at the servo thread period.
El 14/11/2013 12:23, "Michael Haberler" <[email protected]> escribió:
Am 14.11.2013 um 16:03 schrieb Maximiliano Fermín Córdoba <
[email protected]>:
Hi
I´ve made another test, setting feedrate at 5000 mm/min, in my case
should
-----------------------------------^^^^^^^^^ you are obviously running a
G-code program then?
give me a 41,6khz step rate,, but when I measured it whit the scope, I´m
seeing a lot of jitter in the steps.
I´ve seen a picture of the performance of the PRU with perfect results at
40000 hz, so I thought I should point this out.
what are you trying to find out?
if you want to find out about the PRU stepgen signal quality, then you
should set it up with HAL to run at fixed speed
if you are testing via a G-code program, this means jitter by the
operating system modulates the commanded position of motion and hence the
input of stepgen, in which case you are looking at motion signal quality,
not stepgen performance
- Michael
Thanks everybody
Maxi
2013/11/14 Maximiliano Fermín Córdoba <[email protected]>
HI
I´m trying to modify the BeBoPr-Bridge.ini file, but I get stuck when I
saw that the steps timing config was already OK for me. (I need pulses
of
1useg and 1useg minimum distance between each other)
The thing is that I´m seeing step pulses of 10usec width, but the config
is set to 1useg ([...] STEPLEN 1000 in nanoseconds [...]).
Is this an issue of the minimum step pulse possible ?
Also, an error come out saying : "hpg: stepgen.00.maxvel is too big for
current step timings & position-scale, clipping to max possible". Has
this
something to do with my issue?
Thanks to all of you
2013/11/13 Charles Steinkuehler <[email protected]>
On 11/13/13 20:01, Jeff Pollard wrote:
Hi,
I never found a GUI editor available on the BBB Machinekit system
through the desktop (doesn't mean it's not there somewhere). I
installed 'gedit' once, but later my system started getting realtime
delay errors popping up in Axis. I'm not sure if gedit itself caused
the problem, but it started right after I installed it.....
Yeah, there might not be one. By default, I install the bare minimum
to
get LinuxCNC up and running (I don't even install vim, just the plain
vi
pulled in by the default Debian install).t I figured there might be
something in the file browser or elsewhere, but it wouldn't shock me if
there's not.
I'll have to see if I can find a light-weight editor to add to the
package list...
--
Charles
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