Re: [Emc-users] Beating Grub2 into submission

[Tom Easterday]

On Apr 7, 2011, at 11:44 PM, Kent A. Reed wrote:
> Now that I know how easy it is, I may try a second approach, just 
> modifying 10_linux so that it differentiates between rtai- and non-rtai 
> linux kernels. [Although I'm not sure that's the answer for me because I 
> like being able to boot the rtai kernel without isolcpus=1 to see what 
> difference it makes on different boards.]

Personally, I would prefer adding my own just to keep it distinct from what 
already exists.

> If I can get a moment tomorrow, I'll add what I've learned to the wiki 
> under Misc Stuff.

Cool, please do!  Please post the link to the wiki since I am not sure which 
wiki you are going to update - seems like where were a couple posted in this 
thread.

> A question to you boot buffs. Does it make sense to include that 
> isolcpus=1 parameter in a recovery-mode entry for an rtai kernel?


IMO, it is a noop since I (personally) wouldn't run in recovery mode.

-Tom
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Re: [Emc-users] Android powered touch screen tablets

[Kyle Kerr]

Yes, the G1 supports wifi, 802.11b.

On Thu, Apr 7, 2011 at 8:41 PM, Mark  wrote:
> Once people start getting rid of their old android phones, you'll be able to
> pick up used ones pretty cheap.  I don't know if the G1 supports wifi, but I
> think just about every android device after that does.
>
> Of course, the screen isn't all that big - but being able to put it in your
> pocket is a definite plus. Less likely to fall in the chip conveyor if it's
> in your pocket! :D
>
> Mark

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Re: [Emc-users] Beating Grub2 into submission

[Kent A. Reed]

On 4/6/2011 9:00 AM, Kent A. Reed wrote:
> ...
> I'm getting too old to want to play this game but doesn't it seem there
> is another alternative? Namely, insert another script to grub.d, call it
> 05_rtai, say, that adds the isocpus parameter just to rtai entries. If
> 10_linux results in the same kernels being entered later in the boot
> order with the standard parameters, so what?
>
The answer to my own question is, yes, one can add a new script to do 
what I said, in my case a script named 07_rtai once I found out that a 
05_ script already existed.

I created 07_rtai pretty trivially by reverse-engineering and editing a 
copy of 10_linux. Then I lost an hour or so being confused by my tests 
of the script before discovering grub2 limits user-defined keys to names 
predefined in a deeply buried list---yikes, that killed an attempt to 
allow more flexibility by adding a new key to /etc/default/grub).

My new script works fine dropped into /etc/grub.d/ on a Ubuntu 10.04 
system with both an rtai and a non-rtai version of the linux-2.6.32 
kernel installed. I end up with six linux entries in 
/boot/grub/grub.cfg: 2 new entries including isolcpus=1 from 07_rtai for 
just the rtai kernel followed by the traditional 4 entries from 10_linux 
for the rtai and non-rtai kernels.

Now that I know how easy it is, I may try a second approach, just 
modifying 10_linux so that it differentiates between rtai- and non-rtai 
linux kernels. [Although I'm not sure that's the answer for me because I 
like being able to boot the rtai kernel without isolcpus=1 to see what 
difference it makes on different boards.]

If I can get a moment tomorrow, I'll add what I've learned to the wiki 
under Misc Stuff.

A question to you boot buffs. Does it make sense to include that 
isolcpus=1 parameter in a recovery-mode entry for an rtai kernel?

Regards,
Kent


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Re: [Emc-users] Android powered touch screen tablets

[Mark]

Once people start getting rid of their old android phones, you'll be able to
pick up used ones pretty cheap.  I don't know if the G1 supports wifi, but I
think just about every android device after that does.

Of course, the screen isn't all that big - but being able to put it in your
pocket is a definite plus. Less likely to fall in the chip conveyor if it's
in your pocket! :D

Regarding apps, there are several available.

Here's a vnc viewer - http://code.google.com/p/android-vnc-viewer/

http://code.google.com/p/remotedroid/ emulates a touchpad and keyboard only
- no video. Non-free version has more features.

Mark
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Re: [Emc-users] Monitor and control my CNC through an IP camera ?

[Kirk Wallace]

On Thu, 2011-04-07 at 10:54 -0700, Kirk Wallace wrote:
... snip
> In case it might help, here is a link to some remote control and
> multi-interface information:
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Running_Multiple_User_Interfaces 
> 
> This page really needs to be updated, but might provide be a decent start.

Here are a couple more links:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?EMCDisplayOnWindows 
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Emcrsh 

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] Monitor and control my CNC through an IP camera ?

[Kirk Wallace]

On Thu, 2011-04-07 at 18:53 +0200, Rando Sauvage wrote:
... snip
> So, I would like to run my CNC while I am not at home (eg while I am
> at work), but still want to take an eye on my CNC through an IP camera
> + *get the possibility to remote control the AXIS GUI* (this is the
> important part ;-))
... snip

In case it might help, here is a link to some remote control and
multi-interface information:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Running_Multiple_User_Interfaces 

This page really needs to be updated, but might provide be a decent start.
-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] OT made a new milling enclosure

[Roland Jollivet]

AFAIK Lexan is specifically designed for tough impact conditions, like a
window on a machining centre, so no, it wont shatter.

Roland


On 6 April 2011 17:19, Igor Chudov  wrote:

> I did an experiment. I took a 1/4" thick piece of junk Lexan, and beat it
> with a steel bar. The Lexan piece would not shatter. It is supposed to be
> bendable cold, but I do not have the facilities to do this.
>
> I bend mine with a gas torch. I learned how to be careful with the torch,
> to
> avoid most surface bubbling. I still get some bubbles, but not too much,
> and
> it is just fine for a mill enclosure. I tried a plastic heating strip, it
> was not hot enough for 1/4" Lexan.
>
> i
>
> On Wed, Apr 6, 2011 at 10:15 AM, Dave  wrote:
>
> > Plexiglas does shatter...   I have first hand experience with that.
> >
> > I thought thermoforming was required of Lexan also, otherwise I would
> > have bending Lexan years ago!  :-)
> >
> > That is a huge advantage.
> >
> > Dave
> >
> > On 4/6/2011 10:48 AM, Mark Wendt wrote:
> > > On 04/06/2011 10:36 AM, Dave wrote:
> > >
> > >> It does make logical sense but all of the websites ( I found ) say
> that
> > >> heat is required to bend polycarbonate.
> > >>
> > >> Perhaps they are confusing Lexan with Plexiglass...
> > >>
> > >> I like the "just throw it in the bender" idea myself!  :-)
> > >>
> > >> Much simpler.
> > >>
> > >> Thanks,
> > >>
> > >> Dave
> > >>
> > > Plexiglas is likely to just shatter.  Lexan seems to be a bit more
> > pliable.
> > >
> > > Mark
> > >
> > >
> >
> --
> > > Xperia(TM) PLAY
> > > It's a major breakthrough. An authentic gaming
> > > smartphone on the nation's most reliable network.
> > > And it wants your games.
> > > http://p.sf.net/sfu/verizon-sfdev
> > > ___
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >
> > >
> >
> >
> >
> >
> --
> > Xperia(TM) PLAY
> > It's a major breakthrough. An authentic gaming
> > smartphone on the nation's most reliable network.
> > And it wants your games.
> > http://p.sf.net/sfu/verizon-sfdev
> > ___
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> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> --
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> smartphone on the nation's most reliable network.
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] Monitor and control my CNC through an IP camera ?

[Stephen Wille Padnos]

Rando Sauvage wrote:
> Hi,
>
>
> I am an EMC2 user and currently I am doing some pieces which take
> several hours to mill.
> So, I would like to run my CNC while I am not at home (eg while I am
> at work), but still want to take an eye on my CNC through an IP camera
> + *get the possibility to remote control the AXIS GUI* (this is the
> important part ;-))
>
> Basically what I would need is:
> 1) Remotely pause and continue a running GCode program.
>
> 2) While the program is paused, I need to be able to stop the spindle
> and the lube (these one are important because eg if the mill broke, I
> need to stop the spindle ASAP. but I don't know if it is possible
> since I can't stop the spindle from AXIS while a program is paused)
>
> I did some research but I am a bit lost ... I found that maybe I could
> use "axis-remote" or "emcrsh" ?
> Which one is should I use ? (remember that I want to keep axis running
> on my EMC2 machine).
> Can someone show me what to do to pause a running program ? (eg
> "axis-remote --mdi ?")
>
You don't need any IP cameras or other hoo-ha to remote control EMC.  Of 
course, if you want to see the actual machine, an IP camera is a 
reasonable way of doing that.

EMC has been designed from the start to allow multiple user interfaces, 
which can be on a remote machine if you like.  This is in addition to 
the option of running a remote X session, or remote desktop software 
such as VNC.

The NML messaging system allows you to set up channels as being remote.  
I believe there are sample server.nml and client.nml files in the sample 
configs directory (maybe in common/ or something).

You can run AXIS on the EMC machine and start a program running.
When you get to work or wherever, fire up Axis, tkEMC, mini, emcrsh - 
whatever, and if the NML file is configured correctly, you will connect 
to the remote machine.  Both UIs will be running, and either could take 
control - if someone at home smells smoke and hits ESC on that keyboard, 
the machine will stop.  You will see the change in machine state on your 
remote UI.  Similarly, you can hit ESC to stop the machine, and the UI 
on the PC controlling the machine will show what you have done.

There are a couple of caveats to this:
1) I'm pretty sure that nothing bad happens, but you should experiment 
with running a part and then starting another UI.  Specifically, try 
AXIS - I don't know whether it will happily connect to a running EMC or 
if it will load its "splash file" and stop the machine.
2) Specific to AXIS, you would need a command-line option to disable the 
creation of HAL pins on the remote control PC.  That machine isn't 
likely to (and doesn't need to) run an RT kernel, and besides you don't 
want HAL running on your machine at work, since it's not connected to 
the machine anyway.
3) File handling is a little weird with remote machines.  You need to 
have the loaded file available at the same path on all machines you want 
to run UIs on.  NML doesn't transfer the file, and the status buffer has 
the full path name to the file, so if you want to see the code as it's 
executing, you'll need to make sure you have the same file in the same 
location on the remote PC.

Remote X is an option, but it's probably not the best in the case you're 
talking about.  You could remote into the box and run another UI 
"locally", you'd just see the window on the remote workstation.  This is 
equivalent to running two UIs on the same PC at the same time, so if you 
experiment with that on the EMC machine, it's the same as far as EMC is 
concerned when you access the UI from work.

VNC is the heaviest protocol for this, but has the advantage of running 
only one instance of the UI, and also requiring no configuration of EMC.

Hope this helps
-Steve


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Re: [Emc-users] Monitor and control my CNC through an IP camera ?

[andy pugh]

On 7 April 2011 17:53, Rando Sauvage  wrote:

> So, I would like to run my CNC while I am not at home (eg while I am
> at work), but still want to take an eye on my CNC through an IP camera
> + *get the possibility to remote control the AXIS GUI* (this is the
> important part ;-))

I do this with VNC.

-- 
atp
"Torque wrenches are for the obedience of fools and the guidance of wise men"

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Re: [Emc-users] Monitor and control my CNC through an IP camera ?

[Igor Chudov]

I use a remote IP camera.

Screenshot of it is here:

http://igor.chudov.com/tmp/Netcam.png

Comments below:

On Thu, Apr 7, 2011 at 11:53 AM, Rando Sauvage wrote:

> I am an EMC2 user and currently I am doing some pieces which take
> several hours to mill.
> So, I would like to run my CNC while I am not at home (eg while I am
> at work), but still want to take an eye on my CNC through an IP camera
> + *get the possibility to remote control the AXIS GUI* (this is the
> important part ;-))
>
>
I do the same thing. I also can monitor this netcam on my Android cell
phone.


> Basically what I would need is:
> 1) Remotely pause and continue a running GCode program.
>
>
I have only one command, Estop, implemented as a shell function.

If I log on to the CNC machine and type "estop", the machine goes into
estop.

BLING::~/public_html/tmp==>declare -f estop
estop ()
{
halcmd setp halui.estop.activate 1;
sleep 0.1;
halcmd setp halui.estop.activate 0;
echo Machine E-stopped.
}

It should give you an idea how to pause.



> 2) While the program is paused, I need to be able to stop the spindle
> and the lube (these one are important because eg if the mill broke, I
> need to stop the spindle ASAP. but I don't know if it is possible
> since I can't stop the spindle from AXIS while a program is paused)
>
>
You can probably do this with halcmd. But I think that if end mill broke,
estop is the only reasonable alternative.


> I did some research but I am a bit lost ... I found that maybe I could
> use "axis-remote" or "emcrsh" ?
> Which one is should I use ? (remember that I want to keep axis running
> on my EMC2 machine).
> Can someone show me what to do to pause a running program ? (eg
> "axis-remote --mdi ?")
>
>
>
Not sure how to pause, but see my above estop function.


> Note:
> - I have a SSH connection to the EMC2 computer
> - I could possibly wire a relay on the IP camera to control Axis but
> that's not my preferred solution and I don't even know If I can pause
> EMC2 from an external contact ?
>
>
You surely can pause EMC2 from a external contact, but you can do a lot with
shell and halcmd also.

i
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[Emc-users] Monitor and control my CNC through an IP camera ?

[Rando Sauvage]

Hi,


I am an EMC2 user and currently I am doing some pieces which take
several hours to mill.
So, I would like to run my CNC while I am not at home (eg while I am
at work), but still want to take an eye on my CNC through an IP camera
+ *get the possibility to remote control the AXIS GUI* (this is the
important part ;-))

Basically what I would need is:
1) Remotely pause and continue a running GCode program.

2) While the program is paused, I need to be able to stop the spindle
and the lube (these one are important because eg if the mill broke, I
need to stop the spindle ASAP. but I don't know if it is possible
since I can't stop the spindle from AXIS while a program is paused)

I did some research but I am a bit lost ... I found that maybe I could
use "axis-remote" or "emcrsh" ?
Which one is should I use ? (remember that I want to keep axis running
on my EMC2 machine).
Can someone show me what to do to pause a running program ? (eg
"axis-remote --mdi ?")


Note:
- I have a SSH connection to the EMC2 computer
- I could possibly wire a relay on the IP camera to control Axis but
that's not my preferred solution and I don't even know If I can pause
EMC2 from an external contact ?


Many thanks for your help,
Xavier

P.S. why is there a mailing list + a forum ? Are the persons both
subscribed to the forum and to the mailing list ?

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Re: [Emc-users] HostMot2 FPGA source?

[Peter C. Wallace]

On Wed, 6 Apr 2011, John Murphy wrote:

> Date: Wed, 6 Apr 2011 22:39:33 -0600
> From: John Murphy 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] HostMot2 FPGA source?
> 
> I'm getting ready to integrate several mesa cards around the 7i43, and don't
> see an FPGA load in the default distribution that has all the modules I
> need.
>
> I have Xilinx ISE webpack installed, but can't seem to remember where I got
> the source I had reviewed.  Now that I'm getting ready to roll, I was hoping
> someone could send me a pointer to a link for the latest source.
>
> I'm using the 10.04 live CD installation, which had been running my old mill
> (a benchtop grizzly) using just a direct parallel port wiring.  My new
> system (A bridgeport Boss5 Series1 ) will be based around A 7i43, 7i47, and
> 7i64.  I'd like to build my own FPGA image that had
>
> 5 stepgen
> 1 pwm
> 6 encoders (3 wire)
> 1 smart serial interface
> 1 watchdog
>
> Any pointers would be great!  Thanks,
> John

I dont think EMCs git repository has the latest HostMot2 firmware source for 
the smart serial module, for that you should use the sserial.vhd and 
sslbprom.vhd files from www.mesanet.com/software/parallel/7i43.zip.


Peter Wallace
Mesa Electronics

(\__/)
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(")_(") signature to help him gain world domination.


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Re: [Emc-users] PSU

[gene heskett]

On Thursday, April 07, 2011 10:33:33 AM Ian W. Wright did opine:

> What about the old idea of putting a light bulb in series
> with the mains? Would this have a useful effect?
> 
> ian
> 
If sized right, somewhat useful, but nothing like the NTC goodie.  Sizing 
it right can be a problem when dealing with real horsepower though.

> >Actually a simple resistor in series with the mains works pretty
> >well.
> > 
> > Just make sure it is a wire wound resistor that can take high surge
> > currents.
> 
> 
> -- Xperia(TM) PLAY
> It's a major breakthrough. An authentic gaming
> smartphone on the nation's most reliable network.
> And it wants your games.
> http://p.sf.net/sfu/verizon-sfdev
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-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)


/*
 * Buddy system. Hairy. You really aren't expected to understand this
 *
 */
-- From /usr/src/linux/mm/page_alloc.cA

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Re: [Emc-users] PSU]

[gene heskett]

On Thursday, April 07, 2011 10:27:37 AM Erik Christiansen did opine:

> On Thu, Apr 07, 2011 at 08:10:55AM -0400, gene heskett wrote:
> > An additional thought comes to mind when using them for something like
> > my A3877 based xylotex setup, an extended time at low voltage is not
> > recommended as it causes more heat in the A3977's than the normal
> > voltage, so its possible it could actually increase the 'turnon'
> > failure rate of such devices if its too slow to warm up.
> 
> Gene, you're beginning to convince me there's no such thing as a free
> lunch, and I'd be just as well off going back to my MOSFET idea, which
> leaves a fat (low value) power resistor in series for enough mains
> cycles to charge the capacitor bank, then shunt it with about 5
> milliohms of drain resistance. (In addition to your favourite source, I
> have a tube of 'em waiting to serve man and country. And what's in the
> junkbox is kinda prone to being designed in.)
> 
> Since we only need enough resistance to limit a whacking great inrush
> current, that'll bring up the supply for the control electronics within
> a few mains cycles. I think we'd take a few breaths before starting the
> gcode program and firing up the motors. If the MOSFET is hard on within
> a few hundred milliseconds, then I'd hope stuff like your A3977's would
> be fine, especially since they'd be idling at the time.
> 
> I think drives have to provide their own current limiting once we have
> lift-off. (And they generally do.)
> 
> Erik

Well, I'm probably playing chicken little here when I mentioned it as I 
suspect even the NTC will allow the output of my supply to exceed the 12 
volt minimum for the A3977's within one full cycle of the powerline, or 
16.3 milliseconds.  If I had a problem with the inrush I'd consider 
them, but a simple little alps mini-switch has been working as its power 
switch for a good 3 or 4 years now.  Mounted in a shack mini project box 
right in the line cord.  Like you, whats in my junkbox tends to be what 
gets designed in. ;-)

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)


Q:  How many mathematicians does it take to screw in a light bulb?
A:  One.  He gives it to six Californians, thereby reducing the problem
to the earlier joke.

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Re: [Emc-users] HostMot2 FPGA source?

[seb]

It's in a repo at:  http://git.linuxcnc.org

-- 
Sebastian Kuzminsky

- Reply message -
From: "John Murphy" 
Date: Wed, Apr 6, 2011 22:39
Subject: [Emc-users] HostMot2 FPGA source?
To: "Enhanced Machine Controller (EMC)" 

I'm getting ready to integrate several mesa cards around the 7i43, and don't
see an FPGA load in the default distribution that has all the modules I
need.

I have Xilinx ISE webpack installed, but can't seem to remember where I got
the source I had reviewed.  Now that I'm getting ready to roll, I was hoping
someone could send me a pointer to a link for the latest source.

I'm using the 10.04 live CD installation, which had been running my old mill
(a benchtop grizzly) using just a direct parallel port wiring.  My new
system (A bridgeport Boss5 Series1 ) will be based around A 7i43, 7i47, and
7i64.  I'd like to build my own FPGA image that had

5 stepgen
1 pwm
6 encoders (3 wire)
1 smart serial interface
1 watchdog

Any pointers would be great!  Thanks,
John
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Re: [Emc-users] PSU

[Ian W. Wright]

Ok, wrong again...;-} I have seen them used as short circuit 
protection which fits in with what you say.

ian

On 07/04/2011 14:11, Stephen Wille Padnos wrote:
> Ian W. Wright wrote:
>> What about the old idea of putting a light bulb in series
>> with the mains? Would this have a useful effect?
>>
> I think you've got it backwards.
>
> The idea is to use a light bulb as a bleed resistor, and coincidentally
> as a "dangerous voltages present" indicator :)
>
> Light bulbs also have high surge currents, and their resistance is very
> low until heated up.  That's the opposite of the desired effect for an
> inrush limiter.
>
> - Steve
>
>
> --
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Re: [Emc-users] PSU

[Erik Christiansen]

On Thu, Apr 07, 2011 at 02:03:41PM +0100, Ian W. Wright wrote:
> What about the old idea of putting a light bulb in series 
> with the mains? Would this have a useful effect?

It has a large positive temperature coefficient, so admits a large
initial surge, then limits the current to a much lower value once
heated. As you've probably figured already, that's the opposite of what
we're looking for when trying to limit inrush currents.

It's sometimes used to protect against fault currents while
experimenting with circuits which do no draw enough to drive the
filament far up the PTC curve while operating properly.

Erik

-- 
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  - A. E. Newman

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Re: [Emc-users] PSU

[Stephen Wille Padnos]

Ian W. Wright wrote:
> What about the old idea of putting a light bulb in series
> with the mains? Would this have a useful effect?
>
I think you've got it backwards.

The idea is to use a light bulb as a bleed resistor, and coincidentally 
as a "dangerous voltages present" indicator :)

Light bulbs also have high surge currents, and their resistance is very 
low until heated up.  That's the opposite of the desired effect for an 
inrush limiter.

- Steve


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Re: [Emc-users] PSU

[Ian W. Wright]

What about the old idea of putting a light bulb in series 
with the mains? Would this have a useful effect?

ian
>Actually a simple resistor in series with the mains works pretty well.
> Just make sure it is a wire wound resistor that can take high surge
> currents.
>


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Re: [Emc-users] PSU]

[Erik Christiansen]

On Thu, Apr 07, 2011 at 08:10:55AM -0400, gene heskett wrote:
> 
> An additional thought comes to mind when using them for something like my 
> A3877 based xylotex setup, an extended time at low voltage is not 
> recommended as it causes more heat in the A3977's than the normal voltage, 
> so its possible it could actually increase the 'turnon' failure rate of 
> such devices if its too slow to warm up.

Gene, you're beginning to convince me there's no such thing as a free
lunch, and I'd be just as well off going back to my MOSFET idea, which
leaves a fat (low value) power resistor in series for enough mains
cycles to charge the capacitor bank, then shunt it with about 5
milliohms of drain resistance. (In addition to your favourite source, I
have a tube of 'em waiting to serve man and country. And what's in the
junkbox is kinda prone to being designed in.)

Since we only need enough resistance to limit a whacking great inrush
current, that'll bring up the supply for the control electronics within
a few mains cycles. I think we'd take a few breaths before starting the
gcode program and firing up the motors. If the MOSFET is hard on within
a few hundred milliseconds, then I'd hope stuff like your A3977's would
be fine, especially since they'd be idling at the time.

I think drives have to provide their own current limiting once we have
lift-off. (And they generally do.)

Erik

-- 
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They instead seem to be powered by the "pumping" motion of the mouse!
  - William Shotts, Jr. on http://linuxcommand.org/learning_the_shell.ph

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Re: [Emc-users] PSU]

[gene heskett]

On Thursday, April 07, 2011 08:06:47 AM Erik Christiansen did opine:

> Oops, this didn't make it to the list, apparently because Andy had
> mailed both to the list and to me. My mail system detects duplicates,
> and keeps only the first. Unfortunately that was the non-list duplicate.
> Replying to that didn't go to the list.
> 
> I'll have to build better defences against "helpful" duplicates. ;-)
> 
> ... I think I've done it. (Just for this list for now.) One more line in
> .procmailrc. (Later I can figure out how best to replicate for other
> lists.)
> 
> Erik
> 
> - Forwarded message from Erik Christiansen 
> -
> 
> On Thu, Apr 07, 2011 at 10:33:43AM +0100, andy pugh wrote:
> > On 7 April 2011 10:26, Erik Christiansen  
wrote:
> > > Andy, what sort of devices are you using?
> > 
> > http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getP
> > roduct&R=5167827
> 
> Many thanks, Andy.
> 
> Looking at the "Similar Products" tab, I guess I'd use them on the
> primary side of my power transformer, because I'm experimenting with low
> voltage high current motors. (Well, it's what I have to hand. Greater
> expense can come later.) That would allow the NTC to help with toroidal
> transformer thump, too.
> 
> Erik

An additional thought comes to mind when using them for something like my 
A3877 based xylotex setup, an extended time at low voltage is not 
recommended as it causes more heat in the A3977's than the normal voltage, 
so its possible it could actually increase the 'turnon' failure rate of 
such devices if its too slow to warm up.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)


Lavish spending can be disastrous.  Don't buy any lavishes for a while.

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Re: [Emc-users] PSU

[gene heskett]

On Thursday, April 07, 2011 08:01:09 AM andy pugh did opine:

> On 7 April 2011 10:26, Erik Christiansen  wrote:
> > Andy, what sort of devices are you using?
> 
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getPro
> duct&R=5167827

One thing is missing here, actually 2.  What is its NTC?, and how much 
current can it safely pass on a CCS basis?  Without aiming a laser 
thermometer at it once its warmed up, one has no clue if its the correct 
sized device to use.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)


fortune: not found

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Re: [Emc-users] PSU]

[Erik Christiansen]

Oops, this didn't make it to the list, apparently because Andy had
mailed both to the list and to me. My mail system detects duplicates,
and keeps only the first. Unfortunately that was the non-list duplicate.
Replying to that didn't go to the list.

I'll have to build better defences against "helpful" duplicates. ;-)

... I think I've done it. (Just for this list for now.) One more line in
.procmailrc. (Later I can figure out how best to replicate for other
lists.)

Erik

- Forwarded message from Erik Christiansen  -

On Thu, Apr 07, 2011 at 10:33:43AM +0100, andy pugh wrote:
> On 7 April 2011 10:26, Erik Christiansen  wrote:
> 
> > Andy, what sort of devices are you using?
> 
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5167827

Many thanks, Andy.

Looking at the "Similar Products" tab, I guess I'd use them on the
primary side of my power transformer, because I'm experimenting with low
voltage high current motors. (Well, it's what I have to hand. Greater
expense can come later.) That would allow the NTC to help with toroidal
transformer thump, too.

Erik

-- 
Let not the sands of time get in your lunch.

- End forwarded message -

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Re: [Emc-users] PSU

[Les Newell]

They work very well. It pays to get ones that are rated at quite a bit 
above your load current otherwise they do have a tendency to pop.
  Actually a simple resistor in series with the mains works pretty well. 
Just make sure it is a wire wound resistor that can take high surge 
currents.

Les

On 07/04/2011 10:33, andy pugh wrote:
> On 7 April 2011 10:26, Erik Christiansen  wrote:
>
>> Andy, what sort of devices are you using?
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5167827
>


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Re: [Emc-users] PSU

[andy pugh]

On 7 April 2011 10:26, Erik Christiansen  wrote:

> Andy, what sort of devices are you using?

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5167827

-- 
atp
"Torque wrenches are for the obedience of fools and the guidance of wise men"

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Re: [Emc-users] PSU

[Erik Christiansen]

On Wed, Apr 06, 2011 at 09:22:59PM +0100, andy pugh wrote:
> 
> I have plenty of NTC surge limiters.

Andy, what sort of devices are you using? I started building a surge
limiter with MOSFETS. Those NTC things sound kinda useful.

I'm using toroidal transformers, and they can give a big thump on
start-up too.

Erik

-- 
"Necessity is the mother of invention" is a silly proverb. "Necessity is the
mother of futile dodges" is much closer to the truth. The basis of growth of
modern invention is science, and science is almost wholly the outgrowth of
pleasurable intellectual curiosity.  -Alfred N. Whitehead

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Re: [Emc-users] PSU

[Erik Christiansen]

On Wed, Apr 06, 2011 at 08:49:16PM +0100, andy pugh wrote:
> And now the cap sizing.
> If I say that I can put up with 10% ripple at max rated current (7.5A
> for the motors) on a nominal 300V then I end up with
> C = 7.5A X 10mS / 30V = 2500uF.
> 
> Eeek!
> 
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5436785
> 
> Is the cheapest that is even close.
> 
> A thread on CNCzone said 20,000uF per amp, but I decided to ignore that.

That _would_ be excessive at 400 odd volts. Your formula is good enough
for engineers. The CNCzone thread is merely specifying 0.5v of ripple.
Next he'll want the gold plated terminals and "oxygen-free" copper
cables of audiophiles, perhaps.

I thought it was just me who couln't find big low ESR caps at good
prices.

Erik

-- 
Good judgement comes from experience.
Experience comes from bad judgement.  - Jim Horning

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