Re: [Emc-users] No more mails

[Stuart Stevenson]

Victim here also.
I saw the memo, thought it was a scam of some type, ignored it and then
later had to resubscribe.
No harm, no foul, better to be cautious than sorry.

On Wed, Aug 30, 2017 at 4:20 PM, Cecil Thomas 
wrote:

> Peter,
> The same thing happened to me and I had to rejoin.
> Apparently some of the list members got messages from Sourceforge asking
> them to confirm their membership and some didn't.  Those who did not
> confirm their membership ( which would be those who never got the memo)
> were dropped from the list.  If you want to catch up on what has been on
> the list since you were dropped you can scan the archives.
>
> (fellow victim)
> Cecil
>
>
> At 04:50 PM 8/30/2017, you wrote:
>
>> Gentlemen,
>> the email printed below came back for the reason that I wasn't a member
>> of this mailgroup. However, I subscribed as early as 2009! I was forced to
>> join once more, probably with the result that I am considered a newbie now.
>> Peter
>>
>>
>> Gentlemen,
>> since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is there
>> something wrong with my subscription, or is everybody on vacation? Did you
>> change the mail address? In addition, our village has repeatedly been cut
>> off from communications because of cable failures on the way from town to
>> us here way out.
>>
>>
>>
>> Greetings
>> Peter Blodow
>>
>>
>>
>> 
>> --
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
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> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>



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Re: [Emc-users] Backlash compensation speed

[Stuart Stevenson]

Gentlemen,
I don't know specifically about backlash as I use bidirectional lead screw
comp if at all possible.
Many moons ago when I was putting EMC2 on the blue cinci at MPM I noticed
the compensation motion had different velocity and or acceleration. One
direction is was smooth and looked as if the configured axis motion was
applied. The other direction was immediate and sudden. I reported it and it
was fixed in just a few hours. Now both directions obey the configuration
parameters for each axis.

I would think backlash application would also obey axis configuration
parameters.

thanks
Stuart


On Wed, Aug 30, 2017 at 1:30 PM, Gene Heskett  wrote:

> On Wednesday 30 August 2017 12:28:51 David Berndt wrote:
>
> > I was having a backlash issue yesterday that lead me to wondering. How
> > is backlash taken up? At rapid speed? At max acceleration? More? Less?
> > What governs how the motion to backlash comp is taken up?
> >
> > Kind of a moot point because it turned out my backlash problem was
> > some loose bolts in a super inaccessible spot under the saddle... Good
> > times. But still curious about the software side of things.
>
> One of the reasons my Sheldons apron is more easily removed. 12 bolts. 8
> for the plate, 4 for the Z drive nut holder and its all laying on the
> edge of the chip pan.
>
> Backlash comp was at one time done instantly, but that led to stalls and
> lost steps if the lash was more than a thou, so if my memory serves me
> correctly, backlash takeup is now made at the revelant axis's MAX_VEL
> and MAX_ACCELERATION settings. I believe since 2.2.0?  Lots of lash, as
> in 10 thou or so, can be easily observed even at creep speed reversals.
>
> 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 
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>



-- 
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If you are not the addressee then my consent is not given for you to read
this email furthermore it is my wish you would close this without saving or
reading, and cease and desist from saving or opening my private
correspondence.
Thank you for honoring my wish.
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Re: [Emc-users] No more mails

[Cecil Thomas]

Peter,
The same thing happened to me and I had to rejoin.
Apparently some of the list members got messages from Sourceforge 
asking them to confirm their membership and some didn't.  Those who 
did not confirm their membership ( which would be those who never got 
the memo) were dropped from the list.  If you want to catch up on 
what has been on the list since you were dropped you can scan the archives.


(fellow victim)
Cecil

At 04:50 PM 8/30/2017, you wrote:

Gentlemen,
the email printed below came back for the reason that I wasn't a 
member of this mailgroup. However, I subscribed as early as 2009! I 
was forced to join once more, probably with the result that I am 
considered a newbie now.

Peter


Gentlemen,
since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is 
there something wrong with my subscription, or is everybody on 
vacation? Did you change the mail address? In addition, our village 
has repeatedly been cut off from communications because of cable 
failures on the way from town to us here way out.




Greetings
Peter Blodow



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Re: [Emc-users] No more mails

[Peter Blodow]

Gentlemen,
the email printed below came back for the reason that I wasn't a member 
of this mailgroup. However, I subscribed as early as 2009! I was forced 
to join once more, probably with the result that I am considered a 
newbie now.

Peter


Gentlemen,
since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is there 
something wrong with my subscription, or is everybody on vacation? Did 
you change the mail address? In addition, our village has repeatedly 
been cut off from communications because of cable failures on the way 
from town to us here way out.




Greetings
Peter Blodow



--
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Re: [Emc-users] Backlash compensation speed

[Gene Heskett]

On Wednesday 30 August 2017 12:28:51 David Berndt wrote:

> I was having a backlash issue yesterday that lead me to wondering. How
> is backlash taken up? At rapid speed? At max acceleration? More? Less?
> What governs how the motion to backlash comp is taken up?
>
> Kind of a moot point because it turned out my backlash problem was
> some loose bolts in a super inaccessible spot under the saddle... Good
> times. But still curious about the software side of things.

One of the reasons my Sheldons apron is more easily removed. 12 bolts. 8 
for the plate, 4 for the Z drive nut holder and its all laying on the 
edge of the chip pan.

Backlash comp was at one time done instantly, but that led to stalls and 
lost steps if the lash was more than a thou, so if my memory serves me 
correctly, backlash takeup is now made at the revelant axis's MAX_VEL 
and MAX_ACCELERATION settings. I believe since 2.2.0?  Lots of lash, as 
in 10 thou or so, can be easily observed even at creep speed reversals.

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 

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[Emc-users] Backlash compensation speed

[David Berndt]

I was having a backlash issue yesterday that lead me to wondering. How is  
backlash taken up? At rapid speed? At max acceleration? More? Less? What  
governs how the motion to backlash comp is taken up?


Kind of a moot point because it turned out my backlash problem was some  
loose bolts in a super inaccessible spot under the saddle... Good times.  
But still curious about the software side of things.


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[Emc-users] Acceleration Confusion

[王若溪]

I have an XHC-HB04 18-button wireless MPG on my mill. It's amazing that it
works on LinuxCNC. But I found something confusing about acceleration:

   1. The acceleration in [XHC_HB04_CONFIG]mpg_accels seems to have an
   effect on both jogging and program running. Isn't it supposed to affect MPG
   jogging only?
   2. Probably not related to XHC_HB04. Jog acceleration when using
   Shift+Arrow keys seems to be higher than G0 acceleration. I thought they
   should be identical. I'm using Axis GUI, [AXIS_#]MAX_ACCELERATION = 250,
   [AXIS_#]STEPGEN_MAXACCEL = 937.5

Maybe there is some internal mechanism that I don't know, hope someone
could cast some light on it.
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