On May 27, 2012, at 10:50 PM, Jon Elson wrote:
And, I'm not sure you can get this a whole lot better. If the G320 is
responding to electrical
noise on the encoder inputs, no amount of PID tuning will fix it.
And encoder noise it was indeed.
I just realized my motor wasn't grounded (you
On Monday, May 28, 2012 03:10:38 AM Jon Elson did opine:
gene heskett wrote:
Jon, while the encoder I built for the lathe spindle was pretty crude,
one of the things I did in my research was to make it an given that
the opto device chosen had an active, high speed CMOS rail to rail
Jeshua Lacock wrote:
And encoder noise it was indeed.
I just realized my motor wasn't grounded (you know that big hunk of metal
with electricity surging through it intimately connected to the encoder in
question).
Geez, after sending the last message, I really thought I should have
gene heskett wrote:
But there are still plenty of the older TTL stuffs gathering dust on the
shelves at Newark et all. The advantage of CMOS is to me, the much larger
noise immunity. Running on 5 volt rails, noise has to be nearly half that
5 volts in order to even get into the active
On Monday, May 28, 2012 01:40:36 PM Jon Elson did opine:
Jeshua Lacock wrote:
And encoder noise it was indeed.
I just realized my motor wasn't grounded (you know that big hunk of
metal with electricity surging through it intimately connected to the
encoder in question).
Geez, after
On Monday, May 28, 2012 01:45:40 PM Jon Elson did opine:
gene heskett wrote:
But there are still plenty of the older TTL stuffs gathering dust on
the shelves at Newark et all. The advantage of CMOS is to me, the
much larger noise immunity. Running on 5 volt rails, noise has to be
On 27 May 2012 05:16, Jeshua Lacock jes...@3dtopo.com wrote:
The drive is dithering at 0.0003 - 0.0006 with the worst spike now at 0.0012.
...
One encoder pulse is 0.0003 on this axis. Would tuning the PID help with the
spikes
You could consider setting the PID deadband to 1 or 2 encoder
That is a bit of a difficult configuration. I rather like to us
encoders with a RS485 balanced pair output i.e. A, notA, B, notB, etc.
The receivers reject noise much better in htat configuration.
You might try to find a powder iron or ceramic ring-core and loop all
encoder wires through a few
On Sat, 2012-05-26 at 22:16 -0600, Jeshua Lacock wrote:
... snip
You can sort-of see that I did that with my power and step/dir lines
in this cabinet:
https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZETYmyPJy0liipFm0?feat=directlink
... snip
Your cabinet looks a lot better
On 27 May 2012 18:48, Kirk Wallace kwall...@wallacecompany.com wrote:
https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZETYmyPJy0liipFm0?feat=directlink
Your cabinet looks a lot better than mine, but... I have a thing about
Zip-ties.
Zip ties! How very dare you! That's
Zip ties! How very dare you! That's harness lacing, that is.
Oh dear, did you catch that affliction in your seafaring days, did you,
Andy?
j.
On Sun, May 27, 2012 at 8:07 PM, andy pugh bodge...@gmail.com wrote:
On 27 May 2012 18:48, Kirk Wallace kwall...@wallacecompany.com wrote:
On Sunday, May 27, 2012 03:40:41 PM Jon Elson did opine:
Jeshua Lacock wrote:
Then, just to see what might happen, I cut the encoder ground
connected to the encoder shield, and it looks like (preliminary
speaking) it no longer faults out.
This seems to indicate that the encoder shield
On Sunday, May 27, 2012 04:06:25 PM andy pugh did opine:
On 27 May 2012 18:48, Kirk Wallace kwall...@wallacecompany.com wrote:
https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZET
YmyPJy0liipFm0?feat=directlink
Your cabinet looks a lot better than mine, but... I have a
Here is an article about effective EMI screening for those interested in
the subject.
http://www.ce-mag.com/99ARG/Bjorklof137.html
j.
On Sun, May 27, 2012 at 10:09 PM, gene heskett ghesk...@wdtv.com wrote:
On Sunday, May 27, 2012 04:06:25 PM andy pugh did opine:
On 27 May 2012 18:48,
On May 27, 2012, at 5:30 AM, andy pugh wrote:
On 27 May 2012 05:16, Jeshua Lacock jes...@3dtopo.com wrote:
The drive is dithering at 0.0003 - 0.0006 with the worst spike now at 0.0012.
...
One encoder pulse is 0.0003 on this axis. Would tuning the PID help with the
spikes
You could
On May 27, 2012, at 10:12 AM, Jon Elson wrote:
Jeshua Lacock wrote:
Then, just to see what might happen, I cut the encoder ground connected to
the encoder shield, and it looks like (preliminary speaking) it no longer
faults out.
This seems to indicate that the encoder shield was
On May 27, 2012, at 11:21 AM, Kirk Wallace wrote:
On Sat, 2012-05-26 at 23:31 -0500, Jon Elson wrote:
... snip
Jeshua's AMT-103 encoder has a 2 mA source/sink driver when used by
itself (without
the line driver cable option). So, you can't apply too much of a
pull-down or it will
alter
Kirk Wallace wrote:
This is getting messy. I made a first attempt at a schematic of a single
encoder setup. It should be attached. Also, the Inkscape SVG file is
attached if someone wants to edit it. There are some missing bits, such
as, how each component gets powered and grounded. I assumed
gene heskett wrote:
Jon, while the encoder I built for the lathe spindle was pretty crude, one
of the things I did in my research was to make it an given that the opto
device chosen had an active, high speed CMOS rail to rail output. While
the qradrature may not have been accurate enough
Jeshua Lacock wrote:
I captured a big spike event (16 encoder counts!), but for the life of me, I
cannot figure which came first (the seem to be at the same instant?). I have
two screen captures online, 1 so you can see the whole event and the second
zoomed in as far as possible at the
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for no obvious reason it jumps up to 0.02+ inches and
doesn't attempt to return to the correct location. It just jumps
On 26 May 2012 09:26, Jeshua Lacock jes...@3dtopo.com wrote:
I wish I had a magnet implant like this guy that can feel magnetic fields:
Get careless enough with the swarf on your machine and it is likely to happen.
(I have had painful shocks from 5V which has led me to locate bits of
embedded
how many wires is your encoder Jeshua?
j.
On Sat, May 26, 2012 at 10:26 AM, Jeshua Lacock jes...@3dtopo.com wrote:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for
did you twist the powerwires of the motor together to minimize stray
magnetic fields from the cable?
j.
On Sat, May 26, 2012 at 12:48 PM, Jan de Kruyf jan.de.kr...@gmail.comwrote:
how many wires is your encoder Jeshua?
j.
On Sat, May 26, 2012 at 10:26 AM, Jeshua Lacock jes...@3dtopo.com
On Saturday, May 26, 2012 07:12:02 AM Jeshua Lacock did opine:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for no obvious reason it jumps up to 0.02+
inches and
On Sat, 2012-05-26 at 02:26 -0600, Jeshua Lacock wrote:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for no obvious reason it jumps up to 0.02+ inches
and doesn't
Jeshua Lacock wrote:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for no obvious reason it jumps up to 0.02+ inches
and doesn't attempt to return to the correct
On May 26, 2012, at 4:50 AM, Jan de Kruyf wrote:
did you twist the powerwires of the motor together to minimize stray
magnetic fields from the cable?
I did not know about that!
I guess that will be my first cause of action….
Best,
Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated
On May 26, 2012, at 5:44 AM, gene heskett wrote:
On Saturday, May 26, 2012 07:12:02 AM Jeshua Lacock did opine:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for
On May 26, 2012, at 9:49 AM, Jon Elson wrote:
Jeshua Lacock wrote:
Greetings,
I am now setting up my new X axis servo with an AMT 102 encoder.
The motor is normally dithering between 0.0003 and 0.0006 inches.
But every now and then - for no obvious reason it jumps up to 0.02+ inches
On 26 May 2012 21:10, Jeshua Lacock jes...@3dtopo.com wrote:
http://3DTOPO.com/CNC-enclosure.png
Don't judge me too harshly, I was making sure everything works before I
finish tiding things up! Any suggestions would be greatly appreciated!
You could try routing the power and encoder in
On May 26, 2012, at 2:16 PM, andy pugh wrote:
On 26 May 2012 21:10, Jeshua Lacock jes...@3dtopo.com wrote:
http://3DTOPO.com/CNC-enclosure.png
Don't judge me too harshly, I was making sure everything works before I
finish tiding things up! Any suggestions would be greatly appreciated!
On Saturday, May 26, 2012 08:30:46 PM Jeshua Lacock did opine:
Sorry for the late reply, I rebooted this box because it was getting laggy
early this morning, an the whole darned nvidia-current chain took a dump on
me. Just now got it back among the living.
On May 26, 2012, at 5:44 AM, gene
On Sat, 2012-05-26 at 13:45 -0600, Jeshua Lacock wrote:
... snip
Interesting. So the pull down resistor would go on the encoder ground?
No, between the encoder input terminal for each input having a problem
to the ground associated with the input. This will lower the input
impedance so the noise
On May 26, 2012, at 2:16 PM, andy pugh wrote:
On 26 May 2012 21:10, Jeshua Lacock jes...@3dtopo.com wrote:
http://3DTOPO.com/CNC-enclosure.png
Don't judge me too harshly, I was making sure everything works before I
finish tiding things up! Any suggestions would be greatly appreciated!
Jeshua Lacock wrote:
On May 26, 2012, at 9:49 AM, Jon Elson wrote:
Does this position change show up on the LinuxCNC DRO display, or are
you reading
it with a mechanical indicator?
Yes, it shows up on the DRO and the machine physically moves. So I guess they
agree.
Oh, well,
On May 26, 2012, at 7:55 PM, Kirk Wallace wrote:
On Sat, 2012-05-26 at 13:45 -0600, Jeshua Lacock wrote:
... snip
Interesting. So the pull down resistor would go on the encoder ground?
No, between the encoder input terminal for each input having a problem
to the ground associated with the
Kirk Wallace wrote:
On Sat, 2012-05-26 at 13:45 -0600, Jeshua Lacock wrote:
... snip
Interesting. So the pull down resistor would go on the encoder ground?
No, between the encoder input terminal for each input having a problem
to the ground associated with the input. This will
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