On Fri, Oct 26, 2007 at 08:37:47PM -0500, Javid Butler wrote:
The real problem is the endpoint device. There will have to be some way to
decode the signals from the ethernet into the actual drives. It will
probably be a while before cost effective drives are available with ethernet
inputs.
EMC 2.1.x is unlikely to work on Ubuntu 7.10. However, the development
version has been improved in various ways for compatability with newer
versions of Ubuntu.
On Ubuntu 7.10 the default amount of locked memory for regular users
is too low. You can fix that problem by adding the line
hard
What I had in mind is a DEDICATED ethernet segment. There would be no other
traffic on it other than our RT traffic.
I would NOT use UDP; I would use raw ethernet packets.
Ken
[EMAIL PROTECTED]
Mark Kenny Products Company, LLC
55 Main Street Voice: (888)ISO-SEVO (888)476-7386
Newtown, CT
The issue is at the PC end.
In the past, parallel ports have been used, but it takes about a microsecond
per byte to output to them. Ethernet has the advantage is that the
controllers are PCI based and are a lot faster.
Ken
[EMAIL PROTECTED]
Mark Kenny Products Company, LLC
55 Main Street
Is there some G command that works like the HOME button in AXIS or
TKEMC that simply makes the present position HOME Without
storing offsets in the .var file
I am trying to do what appears to be a simple operation in g code but
it seems to be over my head.
here's the setup:
I am using
I have searched the users and integrators manuals and can't find this
but maybe I've missed it.
When strange things appear on startup of my axis or tkemc it is
usually because there is a value stored in the .var file.
If I zero out the strange numbers and save the .var file and restart
it
This is a good explaination coordinate systems.
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?CoordinateSystems
The var file info is here
http://www.isd.mel.nist.gov/documents/kramer/RS274NGC_3.pdf on page 13.
- Original Message -
From: Cecil Thomas [EMAIL PROTECTED]
To: Enhanced
Jeff,
Thanks - I will give that a try. I think a shared memory error was in
the mix.
I also need to manually create the application menu entries.
/usr/local/bin/emc is obvious. Are there any other executables that
users should be able to run from the menu?
Once I have this set up I will
Stephen Wille Padnos wrote:
Jon Elson wrote:
As long as you could throttle traffic on that ethernet segment,
so a network file transfer, for instance, couldn't bog down the
ethernet, then that would work.
No, it wouldn't (not necessarily).
You'd also have to set the MTU pretty low. A
Rafael Skodlar wrote:
I would not want to rely on UDP for real time applications unless it's
used on an isolated network with a limited number of well behaving
nodes.
Yes, you would have to do it that way.
Gigabit ethernet would be better but then which microcontroller will be
able to
Kirk Wallace wrote:
I am wondering if these motors, if scaled up could work as servo motors.
http://www.torcman.de/peterslrk/LRK350-20-15_eng.html
http://www.torcman.de/peterslrk/index_eng.html
http://groups.yahoo.com/group/lrk-torquemax/
Being able to build my own servo motors is very
Jon, Rafael, et al
IIRC CAN is 1 Mbit/sec.
Philosophically I'd opt for KISS. (keep it simple stupid).
No more complexity than is necessary to get the job done.
To me that sounds a lot like raw packets point to point.
Dave
On Oct 29, 2007, at 10:33 AM, Jon Elson wrote:
Rafael Skodlar wrote:
Erik Christiansen wrote:
On Fri, Oct 26, 2007 at 08:37:47PM -0500, Javid Butler wrote:
The real problem is the endpoint device. There will have to be some way to
decode the signals from the ethernet into the actual drives. It will
probably be a while before cost effective drives are available
CAN is indeed a maximum 1Mbps, however about 50% of that is overhead, so
the actual data bandwidth is more like a max of 500kbps. This is over a
distance of something like 40 meters.
CAN only defines the physical connection and message frame format. All
the bit stuffing, sync, acknowlegements and
On Mon, 29 Oct 2007, Jon Elson wrote:
The idea is that 100 mbit/sec ethernet is fast. What other
RS485 device do you have that runs that fast?
Of course a RS-485 link can have smaller packets, and may actually have much
better real time performance. (a single 10 MBps RS-485 link will have
I really think all of the thread raised issues have been addressed by
Ethercat:
1. it uses Ethernet (100MBps max) raw packages
2. there is an opensource Ethercat Master, which runs under linux/RTAI
(http://www.etherlab.org/en/ethercat/index.php)
3. you could command motion and IO devices using
I really think all of the thread raised issues have been addressed by
Ethercat:
Umm, no... As master, no problem but slaves will be expensive:
Ethercat slaves require either custom proprietry hardware or proprietary IP
You can not use a generic ucontroller with Ethernet as a EtherCat slave.
Umm, no... As master, no problem but slaves will be expensive:
Ethercat slaves require either custom proprietry hardware or proprietary
IP
Hmm, unfortunately I can't argue there.. been trying to find some prices for
a slave chip.
I found some products, but no prices anywhere:
- beckhoff
On Mon, Oct 29, 2007 at 09:58:30AM -0500, Cecil Thomas wrote:
I guess I'm looking for the reverse directory for the .var file.
Please see:
http://www.linuxcnc.org/docview/2.2/html/gcode_main.html#sub:Parameters
-
This
Is 100BaseT ethernet full duplex? (I think it is.)
In principle, one could make a hub (not technically a hub) that daisy
chained cables. So, the master would output to slave 1 abd input from slave
N. Slave 1 would input from the master and output to slave 2. Slave 2 would
input from slave 1 and
I have narrowed the problem down to this:
[EMAIL PROTECTED]:~$ /usr/local/bin/halcmd help
Segmentation fault
[EMAIL PROTECTED]:~$ su
Password:
[EMAIL PROTECTED]:/home/andy# /usr/local/bin/halcmd help
Use 'help command' for more details about each command
Available commands:
loadrt
A system call trace (produced by using strace) or a backtrace at the
time of the segmentation fault (produced using gdb) would be helpful
in pinpointing the location of the problem.
You can find information how to use these utilities on many pages on the
internet.
Jeff
Thanks. It seg faults at line 2350 in hal_lib.c:
static int init_hal_data(void)
{
/* has the block already been initialized? */
if (hal_data-version != 0) {
It appears that hal_data is NULL at this point. Here is the call stack:
hal/utils/halcmd_main.c:195 (main)
hal/utils/halcmd.c:109
Peter C. Wallace wrote:
On Mon, 29 Oct 2007, Jon Elson wrote:
The idea is that 100 mbit/sec ethernet is fast. What other
RS485 device do you have that runs that fast?
Of course a RS-485 link can have smaller packets, and may actually have much
better real time performance. (a single 10
Has CNC changed the way keyways are made? I need to make some keyways
for my mill conversion, and I have no tooling so far for doing it. Since
I will may be buying tooling, I want to explore the options in order to
make the best investment. I actually prefer not having keyways and going
with set
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