Re: [Emc-users] Unexpected move after Stop

[Tomaz T .]

I also tried to prevent this move to happen with lowering Max Velocity slider 
to zero (before pressing Stop), then warning show up: can't do that 
(EMC_TRAJ_SET_TELEOP_ENABLE) in auto mode with interpreter idle.

> 
> I seem to recall that 5axiskins links to the tool-length offset, so a
> change in tool length might change the apparent position of the
> controlled point, which the servo loop will attempt to correct.
> 

  
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[Emc-users] slow time, or server upchuck (again)

[Gene Heskett]

Greetings all;

Its been 10 days since I last rx'd a message from this list.  Is 
everybody on vacation?

Cheers, Gene Heskett
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-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] slow time, or server upchuck (again)

[Peter Blodow]

Gene, haven't heard a lot from you recently, either - thought you were 
rinsed away by a little water, as I read in the news?
Peter

Am 26.06.2016 15:22, schrieb Gene Heskett:
> Greetings all;
>
> Its been 10 days since I last rx'd a message from this list.  Is
> everybody on vacation?
>
> Cheers, Gene Heskett


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[Emc-users] slow time, or server upchuck (again)

[Roland Jollivet]

There's been a few topics since then, but maybe not new. See a screenshot
of the list on my PC;

Let me know if you get the image ok, it's the first time I'm trying out
that paste site.

Regards
Roland


On 26 June 2016 at 15:22, Gene Heskett  wrote:

> Greetings all;
>
> Its been 10 days since I last rx'd a message from this list.  Is
> everybody on vacation?
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page 
>
>
> --
> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
> present their vision of the future. This family event has something for
> everyone, including kids. Get more information and register today.
> http://sdm.link/attshape
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] slow time, or server upchuck (again)

[Nicklas Karlsson]

No I am here but have been busy working on a EDM generator and other hardware, 
it is coming fruition right now. I have a few ideas for development machine 
start to run which is happening right now, hardware is OK and software is 
running.


Nicklas Karlsson


On Sun, 26 Jun 2016 09:22:50 -0400
Gene Heskett  wrote:

> Greetings all;
> 
> Its been 10 days since I last rx'd a message from this list.  Is 
> everybody on vacation?
> 
> Cheers, Gene Heskett
> -- 
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page 
> 
> --
> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
> present their vision of the future. This family event has something for
> everyone, including kids. Get more information and register today.
> http://sdm.link/attshape
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users

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Re: [Emc-users] Coffecup EDM

[Nicklas Karlsson]

Well it seems to work I got something like a frying sound and machining half of 
the time with shors and opens.

> Nicklas
> regarding 'start of period to count'
> there is a concept in EDM that was branded ISOpuls and more genericly 
> iso-energetic
> 
> it is a method concerning WHEN to begin the on-time count.
> 
> to make each spark have same energy
> the duration of current flow must be equal
> so a circuit to detect the drop from OpenVoltage to DischargeVolatge is used
> to trigger the timer for on time.

I detect the drop from openvoltage to discharge voltage but are not totally 
sure where to put the limit. I assume it must be above the seat otherwise pulse 
may be elongenated.

> ...
> tap water, de-ionized water, thin automotive oil (0-5-10W)  and kerosene 
> all work fine

I will give outomotive oil a try to.

> i used peanut oil once for a medical application where the fda claimed 
> the oil based fluid contaminated the recast layer.

Nut allergy?

> you do use a fairly open voltage (60-80V=) so that will make the oil 
> quality more important

Open voltage is a little bit above 100 volt.

> if you refer to the previous pdf files you will see the researchers 
> BEGIN counting on-time
> when the voltage drops

I used this I designed hardware and software.

> can you see any sparks?

Barely but I could hear the frying sound and could see voltage in the halscope 
is at seat value about half of the time. Maybe the oil have become to dirty and 
hide the sparks.

> 10 ma at 150 was used in AGie L series generator for a decade, so you 
> are not far off

I had a 1:10 transformer and a 12V servo motor so I ended a little bit above 
100 volt. Will try to find something else or wind myself to get 150 volt.

> i do not understand the 'spark extinguishing voltage' could you say this 
> another way?

Yes below 12 volt current is turned off.

> the ratio of ignitions to attempts to ignite can be a measure of efficiency
> ( and an indication of the correctness and stability of the edm servo 
> tracking )

I try to ignite until successful. Timer is reset then ignited detected by 
voltage falling to ionization voltage then on and off times are counted. I 
could measure time until ignited, open voltage, seat voltage, current.

Your help been really useful. Hopefully I will be able to provide useful 
contribution to linuxcnc rather soon.

Nicklas Karlsson

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[Emc-users] Moving axis while paused

[Danny Miller]

Recently discovered this:

When paused, the axes can't be moved by the user.

While that sounds like a safe protection at first, that's actually a 
critical problem.  It is not uncommon to have to "fix" something 
mid-run.  In a few cases I've seen the CNC router pop freed pieces out 
and they land on the target of a plunge.  When that happens, the bit 
plunged into it and you have an unbalanced chunk of wood free-spinning 
on the bit.


The proper answer to that is to pause, stop the spindle, lift the Z 
enough to get the debris off the spindle, return to where the bit left 
off, restart spindle, and resume.  But, like I say, manual control of 
the axes is locked out and I can't fix it.


Danny


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Re: [Emc-users] Moving axis while paused

[sam sokolik]

take a look at the moveoff component.  It is a 'jog while paused' work 
around.  (it actually works pretty darn good)

there are a few sample configs also

http://linuxcnc.org/docs/html/config/moveoff.html

sam

On 06/26/2016 05:36 PM, Danny Miller wrote:
> Recently discovered this:
>
> When paused, the axes can't be moved by the user.
>
> While that sounds like a safe protection at first, that's actually a
> critical problem.  It is not uncommon to have to "fix" something
> mid-run.  In a few cases I've seen the CNC router pop freed pieces out
> and they land on the target of a plunge.  When that happens, the bit
> plunged into it and you have an unbalanced chunk of wood free-spinning
> on the bit.
>
>
> The proper answer to that is to pause, stop the spindle, lift the Z
> enough to get the debris off the spindle, return to where the bit left
> off, restart spindle, and resume.  But, like I say, manual control of
> the axes is locked out and I can't fix it.
>
>
> Danny
>
>
> --
> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
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> everyone, including kids. Get more information and register today.
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>


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