Re: [Emc-users] AMC seems to have removed all legacy manuals in last couple of days

[dragon]

I discovered this a few weeks back when they launched their new site.
archive.org just generates an empty file with a .pdf extension so it was
no help. I did find that you could still get to them from the European
website... for now.


On 04/10/2017 09:35 PM, Jon Elson wrote:
> On 04/10/2017 08:32 PM, Ken Strauss wrote:
>> Have you checked archive.org for captured copies?
>>
>>
> It turns out the manuals are still there, but you can't get 
> to them from the product selector.  But, if you go in 
> through the document search, and know the part numbers, they 
> still come up.  I downloaded a number of the .pdf files.
> 
> It seems these are not directly available from html, you 
> have to invoke a script to fetch the .pdf for you.
> So, it may be that no archive, wayback, etc. would have them.
> 
> Jon
> 
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Re: [Emc-users] AMC seems to have removed all legacy manuals in last couple of days

[Jon Elson]

On 04/10/2017 08:32 PM, Ken Strauss wrote:
> Have you checked archive.org for captured copies?
>
>
It turns out the manuals are still there, but you can't get 
to them from the product selector.  But, if you go in 
through the document search, and know the part numbers, they 
still come up.  I downloaded a number of the .pdf files.

It seems these are not directly available from html, you 
have to invoke a script to fetch the .pdf for you.
So, it may be that no archive, wayback, etc. would have them.

Jon

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Gregg Eshelman]

You wouldn't want to put R-134a in it.
http://hvac-talk.com/vbb/showthread.php?133531-SubZero-532 

On Monday, April 10, 2017, 3:44:48 AM MDT, Kirk Wallace 
 wrote:On 04/09/2017 09:16 PM, Kirk Wallace wrote:

... snip

> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?

... snip

Roland, Dave, Ray, thank you for your replies. We have had a neighbor in 
the HVAC business top up the R-12 and have gotten away with it for quite 
a few years. The unit is a Sub-Zero 532 built-in, so it would not be 
easy to replace with a standard box.
> https://appliancebuyersguide.com/sub-zero-532-replacing-an-old-or-broken-subzero/

I have been researching the Net to learn how to convert to R-134, find 
leaks and replace the evaporator (normally > $800, part ~$110) myself. 
After watching a few Youtube videos, I am now an expert :). This seems 
to be the best resource so far (click the Look Inside to see the good 
stuff):
> https://www.amazon.com/Refrigeration-Conditioning-Technology-John-Tomczyk/dp/1305578295

Good videos:
https://www.youtube.com/watch?v=pCv7rCdcXsc  (a few in series)
https://www.youtube.com/user/KenTraining/videos  (interesting channel)

I figure the worst case is, I buy a modern used refrigerator and 
transfer all the bits to the S-Z. After I acquire all the tools, I can 
also fix the Explorer and a window unit. I'm also thinking it would be 
cool to add a Linux IoT WiFi thingie with a bunch of sensors to 
monitor... well everything. The original refrigerator didn't even have a 
thermometer. I only knew things weren't going well when the fresh 
veggies went bad after only a few days. I'm keen to fix that.

Sorry if this is noise.
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[John Figie]

Uh no again.  Most camper and rv refrigerators use ammonia continuous cycle
and burn propane to produce heat to power the system.  They have been that
way as long as i can remember.  Now i am not as old as you but i would say
that for at least the last 50 years.   In fact the original Dometic
refrigerator in my 73 Airstream is the ammonia type and it still works
fine.   Dometic is still in business as well as Norcold.

John

On Apr 10, 2017 1:54 PM, "Gene Heskett"  wrote:

> On Monday 10 April 2017 13:59:37 Todd Zuercher wrote:
>
> > Those ammonia cycle refrigerators are pretty common in RVs and
> > campers.
> >
> Uh, no. 99% of those that run on bottle gas are sulphur dioxide based
> units. Actually quite decent efficiency, but the problem with sulphur
> dioxide is that its a very unstable gas, seeking out a molecule of water
> so it can borrow the oxygen atom from it so you have a couple atoms of
> hydrogen left wondering where their oxygen went, but the oxygen is now
> part of a sulphur-trioxide molecule. And guess what, sulphur-trioxide is
> just the technical name for sulphuric acid, CP.  So when they gas them
> up at the factory, the last thing they do is pull the best vacuum they
> know how to do and heat the coils to drive off all the airborn moisture
> they can while holding that vacuum for what to the production people
> think is a waste of time. But anything less will eat their profits in
> warranty claims.  I have read that one molecule of water left in such a
> system, will corrode itself internally, either pinholing the pipeing
> someplace, or the corrosion products will block the gas flow, in less
> than 10 years from the date they seal it shut.
>
> Not to mention that this stuff will do the same thing in your lungs, with
> often fatal results by stealing the water in the lung tissues to make
> sulphuric acid right in your lungs.  The old monitor top GE
> refrigerators were filled with that stuff, and they were  known to be
> killers in the middle of the night if you didn't wake up and vacate the
> premises quickly. I had an aunt and her family that did wake up, but
> they couldn't really breath easy for several months afterwards.
>
> Now you know "the rest of the story" about camper fridges.  If you can't
> hear a compressor running, I'd never sleep in a camper so equipt.
>
> > - Original Message -
> > From: "Kurt Jacobson" 
> > To: "Enhanced Machine Controller (EMC)"
> >  Sent: Monday, April 10, 2017
> > 12:23:20 PM
> > Subject: Re: [Emc-users] Way OT, Unexpected Result from Refrigerator
> >
> > > I am impressed that someone managed to come up with this cycle:
> > > http://www.cs.cmu.edu/~mnr/fridge.html
> >
> > We used to see quite a few ammonia  cycle based refrigerators and
> > central air conditioning units down here in the south (Georgia), but
> > they are becoming scarce now. They were generally reliable and very
> > economical to run, although some of the cheaper units had problems
> > with corrosion in the coils causing them to fail.
> >
> > I was interested in the cycle and as a project for an advanced
> > thermodynamics class I did a detailed analysts of if it with operation
> > cost comparisons etc. As I recall it came out making compressor based
> > systems look very undesirable from an operating cost standpoint. The
> > funny thing is that the power company was offering rebates to people
> > to encourage them to replace there "inefficient" natural gas powered
> > refrigeration systems. Now they are offering rebates to replace
> > "inefficient" gas furnaces with heat-pumps. I think I see a pattern...
> >
> > Cheers,
> > Kurt
> >
> > On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:
> > > On 10 April 2017 at 16:37, Jon Elson  wrote:
> > > > If the condenser pressure is too
> > > > low, you won't get any liquid at all, and the Carnot process
> > > > turns into a really ineffective Brayton (all gas) process.
> > >
> > > I am impressed that someone managed to come up with this cycle:
> > > http://www.cs.cmu.edu/~mnr/fridge.html
> > >
> > >
> > > --
> > > atp
> > > "A motorcycle is a bicycle with a pandemonium attachment and is
> > > designed for the especial use of mechanical geniuses, daredevils and
> > > lunatics."
> > > — George Fitch, Atlanta Constitution Newspaper, 1916
> > >
> > > 
> > > --
> > > 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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> > most engaging 

Re: [Emc-users] AMC seems to have removed all legacy manuals in last couple of days

[Ken Strauss]

Have you checked archive.org for captured copies?

> -Original Message-
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: Monday, April 10, 2017 9:30 PM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] AMC seems to have removed all legacy manuals in last
> couple of days
>
> I just noticed that AMC (Advanced Motion Controls) seems to have pulled
all
> their legacy servo amp manuals from their web site in the last week.  NOT
a
> great discovery!
>
> Jon
>
>

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[Emc-users] AMC seems to have removed all legacy manuals in last couple of days

[Jon Elson]

I just noticed that AMC (Advanced Motion Controls) seems to 
have pulled all their legacy servo amp manuals from their 
web site in the last week.  NOT a great discovery!

Jon

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Gene Heskett]

On Monday 10 April 2017 18:15:00 andy pugh wrote:

> On 10 April 2017 at 22:59, Gene Heskett  wrote:
> > And I got so involved here I forgot a skillet on the stove with
> > dinner in it. Edible but singed a bit.  Oh look, a pony...
>
> In case that worries you, I do that regularly, at a bit more than half
> your age.

Oh dear. :( I take you don't have a chief cook and bottle washer unless 
theres a mirror handy.  I have one, but she never was a cook or bottle 
washer. School teachers tend not to learn those fine old country girl 
arts, too busy sawing away on a Cello, piano or summit. Now she is 
fading, copd, and with a recently busted hip, isn't doing a whole lot at 
76, so generally, its all up to me until whenever.  She's been a good 
girl for going on 28 years, putting up with me and all my hobbies, so I 
don't mind. Keeps me out of the bars don'tcha know. :-)

I did just get finished with making a set of bearing pushers on TLM but 
the 5/16 draw bolt, some redi-thread, may not have the cajones to do the 
job and I'll have to bore them on out for a decent hunk of 1/2" which 
should be quite able to move those bearings.  Only reason for the 5/16" 
is thats what was standing in the corner from the last project.  But 
Tractor Supply is only a 10 or 11 mile round trip. And I keep 20x the 
cost of a long bolt handy.

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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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Gregg Eshelman]

It'd be more cost effective to get the fridge repaired, or replace it.
Has it been doing this for 10 years? Name it William Perry. ;) 
On 10 April 2017 at 06:16, Kirk Wallace  wrote:

> While I think of a tie-in to LinuxCNC, here is the story. I have a
> refrigerator that has a very slow leak which requires us to recharge the
> system after several months. On a new charge, it works great, then I
> need to turn the thermostat up a bit at a time, when that doesn't work,
> I add plastic jugs of ice from the freezer section, but eventually this
> barely keeps the cabinet cold enough. I recently verified that the
> thermostat works and that the compressor is basically on all of the
> time. I got to thinking this is a waste of electricity for something
> that barely works, so I asked myself "if I add more ice and turn the
> thermostat off, will it still be cold enough?"
>
> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?
>
> My thinking is that the compressor is pumping whatever is still in the
> system, which has no cooling effect, from the room temperature condenser
> into the evaporator which then heats the ice in the cabinet.
>
> Maybe?
>
> Like my refrigerator, LinuxCNC can produce unexpected results. (a
> gossamer thread tie-in)
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[andy pugh]

On 10 April 2017 at 22:59, Gene Heskett  wrote:
> And I got so involved here I forgot a skillet on the stove with dinner in
> it. Edible but singed a bit.  Oh look, a pony...

In case that worries you, I do that regularly, at a bit more than half
your age.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Gene Heskett]

On Monday 10 April 2017 16:17:34 Kurt Jacobson wrote:

> Gene, that is very interesting. I have a friend that has an old
> sulphur dioxide
> refrigerator in his shop. It works great and maintains the most
> consistent temperature I have ever seen, even if it is 100F out the
> Pepsi in it will be just a little slushy, which is the way I like it.
>
> Here is a picture:
> https://goo.gl/photos/76idPzpZ5JPunsAt6
>
> He did a power draw test on it and a small dorm fridge, and the
> modern, much smaller, energy star rated fridge used noticeably more
> energy, and it did not have a freezer section to speak of.
>
> I guess if those sulphur dioxide units are put together right to begin
> with can last 80+ years, but if not ...
>
> Cheers,
> Kurt

[...]

I am not surprised, they were and are very efficient.  And I have not 
seen one of those in the wild since back in the late 50's. The one that 
leaked and tried to snuff the aunt, we threw over the hill a few days 
later after the place was aired out in the early 50's. They were just 
across the creek from our place. Both places were little pieces of a 
farm my grandfather had bought and letting the kids have it for peanuts 
made it easier to farm the rest because the tractor or team didn't have 
to muck around in a small corner to work it. Tractors didn't have power 
steering in those days, where the team did their own power steering with 
nothing but a muttered gee, haw, tsk tsk, giddyup, back or whoa.  And it 
made no diff if you were up on the wagons front bench or walking 
beside/behind them picking corn. I recall once grandpa bringing in a 
wagon load of oats from the combine, but all I could see was the team 
and wagon.  Long day, grandpa was sitting in the middle of the 
double-tree, out of sight. That never stopped him when there was work to 
be done.  Old School.

And I got so involved here I forgot a skillet on the stove with dinner in 
it. Edible but singed a bit.  Oh look, a pony...

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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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Kurt Jacobson]

Gene, that is very interesting. I have a friend that has an old
sulphur dioxide
refrigerator in his shop. It works great and maintains the most consistent
temperature I have ever seen, even if it is 100F out the Pepsi in it will
be just a little slushy, which is the way I like it.

Here is a picture:
https://goo.gl/photos/76idPzpZ5JPunsAt6

He did a power draw test on it and a small dorm fridge, and the modern,
much smaller, energy star rated fridge used noticeably more energy, and it
did not have a freezer section to speak of.

I guess if those sulphur dioxide units are put together right to begin with
can last 80+ years, but if not ...

Cheers,
Kurt


On Mon, Apr 10, 2017 at 2:51 PM, Gene Heskett  wrote:

> On Monday 10 April 2017 13:59:37 Todd Zuercher wrote:
>
> > Those ammonia cycle refrigerators are pretty common in RVs and
> > campers.
> >
> Uh, no. 99% of those that run on bottle gas are sulphur dioxide based
> units. Actually quite decent efficiency, but the problem with sulphur
> dioxide is that its a very unstable gas, seeking out a molecule of water
> so it can borrow the oxygen atom from it so you have a couple atoms of
> hydrogen left wondering where their oxygen went, but the oxygen is now
> part of a sulphur-trioxide molecule. And guess what, sulphur-trioxide is
> just the technical name for sulphuric acid, CP.  So when they gas them
> up at the factory, the last thing they do is pull the best vacuum they
> know how to do and heat the coils to drive off all the airborn moisture
> they can while holding that vacuum for what to the production people
> think is a waste of time. But anything less will eat their profits in
> warranty claims.  I have read that one molecule of water left in such a
> system, will corrode itself internally, either pinholing the pipeing
> someplace, or the corrosion products will block the gas flow, in less
> than 10 years from the date they seal it shut.
>
> Not to mention that this stuff will do the same thing in your lungs, with
> often fatal results by stealing the water in the lung tissues to make
> sulphuric acid right in your lungs.  The old monitor top GE
> refrigerators were filled with that stuff, and they were  known to be
> killers in the middle of the night if you didn't wake up and vacate the
> premises quickly. I had an aunt and her family that did wake up, but
> they couldn't really breath easy for several months afterwards.
>
> Now you know "the rest of the story" about camper fridges.  If you can't
> hear a compressor running, I'd never sleep in a camper so equipt.
>
> > - Original Message -
> > From: "Kurt Jacobson" 
> > To: "Enhanced Machine Controller (EMC)"
> >  Sent: Monday, April 10, 2017
> > 12:23:20 PM
> > Subject: Re: [Emc-users] Way OT, Unexpected Result from Refrigerator
> >
> > > I am impressed that someone managed to come up with this cycle:
> > > http://www.cs.cmu.edu/~mnr/fridge.html
> >
> > We used to see quite a few ammonia  cycle based refrigerators and
> > central air conditioning units down here in the south (Georgia), but
> > they are becoming scarce now. They were generally reliable and very
> > economical to run, although some of the cheaper units had problems
> > with corrosion in the coils causing them to fail.
> >
> > I was interested in the cycle and as a project for an advanced
> > thermodynamics class I did a detailed analysts of if it with operation
> > cost comparisons etc. As I recall it came out making compressor based
> > systems look very undesirable from an operating cost standpoint. The
> > funny thing is that the power company was offering rebates to people
> > to encourage them to replace there "inefficient" natural gas powered
> > refrigeration systems. Now they are offering rebates to replace
> > "inefficient" gas furnaces with heat-pumps. I think I see a pattern...
> >
> > Cheers,
> > Kurt
> >
> > On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:
> > > On 10 April 2017 at 16:37, Jon Elson  wrote:
> > > > If the condenser pressure is too
> > > > low, you won't get any liquid at all, and the Carnot process
> > > > turns into a really ineffective Brayton (all gas) process.
> > >
> > > I am impressed that someone managed to come up with this cycle:
> > > http://www.cs.cmu.edu/~mnr/fridge.html
> > >
> > >
> > > --
> > > atp
> > > "A motorcycle is a bicycle with a pandemonium attachment and is
> > > designed for the especial use of mechanical geniuses, daredevils and
> > > lunatics."
> > > — George Fitch, Atlanta Constitution Newspaper, 1916
> > >
> > > 
> > > --
> > > 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
> > > 

Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Przemek Klosowski]

On Mon, Apr 10, 2017 at 12:00 PM, andy pugh 

> I am impressed that someone managed to come up with this cycle:
> http://www.cs.cmu.edu/~mnr/fridge.html


No less a celebrity than Albert Einstein himself:


> https://en.wikipedia.org/wiki/Einstein_refrigerator


and ammonia refrigeratos also had a reputation for poisoning its users when
a leak developed.
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Gene Heskett]

On Monday 10 April 2017 13:59:37 Todd Zuercher wrote:

> Those ammonia cycle refrigerators are pretty common in RVs and
> campers.
>
Uh, no. 99% of those that run on bottle gas are sulphur dioxide based 
units. Actually quite decent efficiency, but the problem with sulphur 
dioxide is that its a very unstable gas, seeking out a molecule of water 
so it can borrow the oxygen atom from it so you have a couple atoms of 
hydrogen left wondering where their oxygen went, but the oxygen is now 
part of a sulphur-trioxide molecule. And guess what, sulphur-trioxide is 
just the technical name for sulphuric acid, CP.  So when they gas them 
up at the factory, the last thing they do is pull the best vacuum they 
know how to do and heat the coils to drive off all the airborn moisture 
they can while holding that vacuum for what to the production people 
think is a waste of time. But anything less will eat their profits in 
warranty claims.  I have read that one molecule of water left in such a 
system, will corrode itself internally, either pinholing the pipeing 
someplace, or the corrosion products will block the gas flow, in less 
than 10 years from the date they seal it shut.

Not to mention that this stuff will do the same thing in your lungs, with 
often fatal results by stealing the water in the lung tissues to make 
sulphuric acid right in your lungs.  The old monitor top GE 
refrigerators were filled with that stuff, and they were  known to be 
killers in the middle of the night if you didn't wake up and vacate the 
premises quickly. I had an aunt and her family that did wake up, but 
they couldn't really breath easy for several months afterwards.

Now you know "the rest of the story" about camper fridges.  If you can't 
hear a compressor running, I'd never sleep in a camper so equipt.

> - Original Message -
> From: "Kurt Jacobson" 
> To: "Enhanced Machine Controller (EMC)"
>  Sent: Monday, April 10, 2017
> 12:23:20 PM
> Subject: Re: [Emc-users] Way OT, Unexpected Result from Refrigerator
>
> > I am impressed that someone managed to come up with this cycle:
> > http://www.cs.cmu.edu/~mnr/fridge.html
>
> We used to see quite a few ammonia  cycle based refrigerators and
> central air conditioning units down here in the south (Georgia), but
> they are becoming scarce now. They were generally reliable and very
> economical to run, although some of the cheaper units had problems
> with corrosion in the coils causing them to fail.
>
> I was interested in the cycle and as a project for an advanced
> thermodynamics class I did a detailed analysts of if it with operation
> cost comparisons etc. As I recall it came out making compressor based
> systems look very undesirable from an operating cost standpoint. The
> funny thing is that the power company was offering rebates to people
> to encourage them to replace there "inefficient" natural gas powered
> refrigeration systems. Now they are offering rebates to replace
> "inefficient" gas furnaces with heat-pumps. I think I see a pattern...
>
> Cheers,
> Kurt
>
> On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:
> > On 10 April 2017 at 16:37, Jon Elson  wrote:
> > > If the condenser pressure is too
> > > low, you won't get any liquid at all, and the Carnot process
> > > turns into a really ineffective Brayton (all gas) process.
> >
> > I am impressed that someone managed to come up with this cycle:
> > http://www.cs.cmu.edu/~mnr/fridge.html
> >
> >
> > --
> > atp
> > "A motorcycle is a bicycle with a pandemonium attachment and is
> > designed for the especial use of mechanical geniuses, daredevils and
> > lunatics."
> > — George Fitch, Atlanta Constitution Newspaper, 1916
> >
> > 
> > --
> > 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
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Cheers, Gene Heskett
-- 
"There are four boxes to be used 

Re: [Emc-users] halui.max-velocity ...

[Sebastian Kuzminsky]

On 04/10/2017 02:18 AM, giorgio foga wrote:
> using JA I try to send halui.max-velocity.decrease/increase trought
> modbus  after more test I see it work well but the result is
> unespected for my config. With axis gui I have max-velocity slider
> that show 21mm/min max velocity ... it is ok ... but if I use
> setp halui.max-velocity.scale .. i try for test these value
> 100-10-1  and It seems it not working well, but when I try to use
> 0.1 and 0.01 I see it work perfect but with undesired result  in
> the past after any test th max-velocity, after press  pycp.button ->
> halui.max-velocity.decrease ... the max-value on axis gui go to 60.0
> and it stop  using scale = 0.1 or 0.01 I see the max-value and
> slider on axis gui goto 60, 59, 58... or 59.9, 59.8, 59.7 etc etc...
> So I see it work but why it go from 21 (my right value) to
> 60.0??? I control axis.py file to undestand why but I have notn see
> anything at odds to my config.
>
> I use angular and linear axis too  obviusly I not seeing the
> right things.

Hi Giorgio, I don't totally understand what you're reporting, but I 
think maybe you're running into a problem with different units being 
used in different places.

The .ini file file has [TRAJ]MAX_VELOCITY, [AXIS_*]MAX_VELOCITY and 
[JOINT_*]MAX_VELOCITY in machine units (mm in your case) per second:

http://linuxcnc.org/docs/devel/html/config/ini-config.html#_traj_section
http://linuxcnc.org/docs/devel/html/config/ini-config.html#_axis__lt_letter_gt_section

But the Axis GUI presents Max Velocity in machine units per minute.

I just ran this test:

I started the sim/axis/axis_mm.ini config, and saw that Axis shows a max 
velocity of 3200 mm/min.  This corresponds to the .ini file's 
[TRAJ]MAX_LINEAR_VELOCITY of 53.34 mm/s.

I then used halcmd to poke at halui.  I first saw that 
halui.max-velocity.value was 53.3 (mm/s), roughly as expected.  I 
set halui.max-velocity.scale to 0.1 (mm/s) and then 
halui.max-velocity.decrease to 1.  That made halui.max-velocity.value 
change to 53.2 mm/s, and the Axis Max Velocity slider changed to 
3193.9 mm/min, which is also right.

I also tested with halui.max-velocity.scale set to 10 mm/s and 100 mm/s, 
and both worked as expected.


I also tried on an inch machine with both linear and rotary axes, and 
while there's only controls for max linear velocity, that config worked 
as expected too.


-- 
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Todd Zuercher]

Those ammonia cycle refrigerators are pretty common in RVs and campers.

- Original Message -
From: "Kurt Jacobson" 
To: "Enhanced Machine Controller (EMC)" 
Sent: Monday, April 10, 2017 12:23:20 PM
Subject: Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

>
> I am impressed that someone managed to come up with this cycle:
> http://www.cs.cmu.edu/~mnr/fridge.html


We used to see quite a few ammonia  cycle based refrigerators and central
air conditioning units down here in the south (Georgia), but they are
becoming scarce now. They were generally reliable and very economical to
run, although some of the cheaper units had problems with corrosion in the
coils causing them to fail.

I was interested in the cycle and as a project for an advanced
thermodynamics class I did a detailed analysts of if it with operation cost
comparisons etc. As I recall it came out making compressor based systems
look very undesirable from an operating cost standpoint. The funny thing is
that the power company was offering rebates to people to encourage them to
replace there "inefficient" natural gas powered refrigeration systems. Now
they are offering rebates to replace "inefficient" gas furnaces with
heat-pumps. I think I see a pattern...

Cheers,
Kurt

On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:

> On 10 April 2017 at 16:37, Jon Elson  wrote:
> > If the condenser pressure is too
> > low, you won't get any liquid at all, and the Carnot process
> > turns into a really ineffective Brayton (all gas) process.
>
> I am impressed that someone managed to come up with this cycle:
> http://www.cs.cmu.edu/~mnr/fridge.html
>
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
> --
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Nicklas Karlsson]

Unexpected smell is rather common then to much time have been spent in front of 
computer solving numerous small problems.

On Mon, 10 Apr 2017 12:23:20 -0400
Kurt Jacobson  wrote:

> >
> > I am impressed that someone managed to come up with this cycle:
> > http://www.cs.cmu.edu/~mnr/fridge.html
> 
> 
> We used to see quite a few ammonia  cycle based refrigerators and central
> air conditioning units down here in the south (Georgia), but they are
> becoming scarce now. They were generally reliable and very economical to
> run, although some of the cheaper units had problems with corrosion in the
> coils causing them to fail.
> 
> I was interested in the cycle and as a project for an advanced
> thermodynamics class I did a detailed analysts of if it with operation cost
> comparisons etc. As I recall it came out making compressor based systems
> look very undesirable from an operating cost standpoint. The funny thing is
> that the power company was offering rebates to people to encourage them to
> replace there "inefficient" natural gas powered refrigeration systems. Now
> they are offering rebates to replace "inefficient" gas furnaces with
> heat-pumps. I think I see a pattern...
> 
> Cheers,
> Kurt
> 
> On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:
> 
> > On 10 April 2017 at 16:37, Jon Elson  wrote:
> > > If the condenser pressure is too
> > > low, you won't get any liquid at all, and the Carnot process
> > > turns into a really ineffective Brayton (all gas) process.
> >
> > I am impressed that someone managed to come up with this cycle:
> > http://www.cs.cmu.edu/~mnr/fridge.html
> >
> >
> > --
> > atp
> > "A motorcycle is a bicycle with a pandemonium attachment and is
> > designed for the especial use of mechanical geniuses, daredevils and
> > lunatics."
> > — George Fitch, Atlanta Constitution Newspaper, 1916
> >
> > 
> > --
> > 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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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Kurt Jacobson]

>
> I am impressed that someone managed to come up with this cycle:
> http://www.cs.cmu.edu/~mnr/fridge.html


We used to see quite a few ammonia  cycle based refrigerators and central
air conditioning units down here in the south (Georgia), but they are
becoming scarce now. They were generally reliable and very economical to
run, although some of the cheaper units had problems with corrosion in the
coils causing them to fail.

I was interested in the cycle and as a project for an advanced
thermodynamics class I did a detailed analysts of if it with operation cost
comparisons etc. As I recall it came out making compressor based systems
look very undesirable from an operating cost standpoint. The funny thing is
that the power company was offering rebates to people to encourage them to
replace there "inefficient" natural gas powered refrigeration systems. Now
they are offering rebates to replace "inefficient" gas furnaces with
heat-pumps. I think I see a pattern...

Cheers,
Kurt

On Mon, Apr 10, 2017 at 12:00 PM, andy pugh  wrote:

> On 10 April 2017 at 16:37, Jon Elson  wrote:
> > If the condenser pressure is too
> > low, you won't get any liquid at all, and the Carnot process
> > turns into a really ineffective Brayton (all gas) process.
>
> I am impressed that someone managed to come up with this cycle:
> http://www.cs.cmu.edu/~mnr/fridge.html
>
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
> --
> 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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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[jrmitchellj .]

W. W. Grainger might be your friend for parts to repair the S. Z.
I have repaired bottle chests (like used in a bar) with parts from them.
Home brewing is annother of my passions.

--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573


The dogmas of the quiet past, are inadequate to the stormy present. The
occasion is piled high with difficulty, and we must rise with the occasion.
As our case is new, so we must think anew and act anew. We must disenthrall
ourselves, and then we shall save our country.*Abraham Lincoln
*, *Annual message
to Congress, December 1, 1862*
*16th president of US (1809 - 1865)*

On Mon, Apr 10, 2017 at 8:40 AM, Kirk Wallace 
wrote:

> On 04/09/2017 09:16 PM, Kirk Wallace wrote:
>
> ... snip
>
> > It turns out, without adding more ice the cabinet actually got cooler by
> > 5 degrees. Uhh?
>
> ... snip
>
> Roland, Dave, Ray, thank you for your replies. We have had a neighbor in
> the HVAC business top up the R-12 and have gotten away with it for quite
> a few years. The unit is a Sub-Zero 532 built-in, so it would not be
> easy to replace with a standard box.
> > https://appliancebuyersguide.com/sub-zero-532-replacing-an-
> old-or-broken-subzero/
>
> I have been researching the Net to learn how to convert to R-134, find
> leaks and replace the evaporator (normally > $800, part ~$110) myself.
> After watching a few Youtube videos, I am now an expert :). This seems
> to be the best resource so far (click the Look Inside to see the good
> stuff):
> > https://www.amazon.com/Refrigeration-Conditioning-
> Technology-John-Tomczyk/dp/1305578295
>
> Good videos:
> https://www.youtube.com/watch?v=pCv7rCdcXsc  (a few in series)
> https://www.youtube.com/user/KenTraining/videos  (interesting channel)
>
> I figure the worst case is, I buy a modern used refrigerator and
> transfer all the bits to the S-Z. After I acquire all the tools, I can
> also fix the Explorer and a window unit. I'm also thinking it would be
> cool to add a Linux IoT WiFi thingie with a bunch of sensors to
> monitor... well everything. The original refrigerator didn't even have a
> thermometer. I only knew things weren't going well when the fresh
> veggies went bad after only a few days. I'm keen to fix that.
>
> Sorry if this is noise.
>
> --
> Kirk Wallace
> http://www.wallacecompany.com/machine_shop/
> http://www.wallacecompany.com/E45/
>
> 
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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Valerio Bellizzomi]

On Mon, 2017-04-10 at 10:05 -0600, Sebastian Kuzminsky wrote:
> On 04/10/2017 09:45 AM, Valerio Bellizzomi wrote:
> > On Mon, 2017-04-10 at 16:30 +0100, andy pugh wrote:
> >> On 10 April 2017 at 15:52, Valerio Bellizzomi  wrote:
> >>> Running the servo jitter test program shows a value of around 6000-7000,
> >>> but the default is 100 !
> >>
> >> That's because a 1mS servo thread is about right for most machines.
> >> Just about the only time that you would need to go faster in the base
> >> thread is if you are doing brushless motor commutation in software.
> >>
> >
> > Yes the latency-test, it shows a figure of around 6000-7000 but when I
> > use that in the config, linuxcnc doesn't start, and the dmesg shows a
> > consistent number of messages related to a cpu being stuck
> 
> The jitter that latency-test determines is *not* the number you should 
> use for your servo-thread period.
> 
> Jitter is the error in scheduling time: the difference between when the 
> thread asked to be woken up, and when it actually was woken up.
> 
> The servo-thread period is *how often* the servo thread wants to be 
> woken up, to perform the next increment of controlling the machine.
> 
> Jitter is usually on the order of a few microseconds to a few tens of 
> microseconds, and is determined by your hardware.  The servo-thread 
> period is usually one millisecond, but sometimes in special 
> circumstances a few times less than that, and is chosen by the machine 
> integrator (the person building and configuring the machine).
> 
> So if pncconf suggested a 1 ms servo-thread period, it did the right thing.
> 
> If you try to run with a servo-thread period of 7,000 nanoseconds you'll 
> have a bad time, because the servo thread generally takes longer than 
> that to run.  So the servo-thread will be unhappy because it doesn't get 
> to run as often as you told it to, and the rest of the system will be 
> unhappy because there won't be any time for anything *other* than the 
> servo-thread.
> 
> It's that "no time for anything else" part that caused the hang when you 
> start LinuxCNC.
> 
> You can see how long the servo-thread takes to do its job by starting 
> LinuxCNC, then running (in a terminal window): halcmd show thread
> 
> The "Max-Time" is the longest the servo-thread has taken to run (so far, 
> it might be more in the future, depending on what it's doing).  If you 
> have a servo-thread period that's shorter than that max-time things 
> aren't going to work well, and if the period is *close* to the thread's 
> max-time there won't be much CPU left over for doing other things (like 
> running your GUI and the rest of your Linux system).
> 
> 


Humm apparently I have confused figures, that's probably because there
is a button "run the latency test" next to the servo value in pncconf




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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Sebastian Kuzminsky]

On 04/10/2017 09:45 AM, Valerio Bellizzomi wrote:
> On Mon, 2017-04-10 at 16:30 +0100, andy pugh wrote:
>> On 10 April 2017 at 15:52, Valerio Bellizzomi  wrote:
>>> Running the servo jitter test program shows a value of around 6000-7000,
>>> but the default is 100 !
>>
>> That's because a 1mS servo thread is about right for most machines.
>> Just about the only time that you would need to go faster in the base
>> thread is if you are doing brushless motor commutation in software.
>>
>
> Yes the latency-test, it shows a figure of around 6000-7000 but when I
> use that in the config, linuxcnc doesn't start, and the dmesg shows a
> consistent number of messages related to a cpu being stuck

The jitter that latency-test determines is *not* the number you should 
use for your servo-thread period.

Jitter is the error in scheduling time: the difference between when the 
thread asked to be woken up, and when it actually was woken up.

The servo-thread period is *how often* the servo thread wants to be 
woken up, to perform the next increment of controlling the machine.

Jitter is usually on the order of a few microseconds to a few tens of 
microseconds, and is determined by your hardware.  The servo-thread 
period is usually one millisecond, but sometimes in special 
circumstances a few times less than that, and is chosen by the machine 
integrator (the person building and configuring the machine).

So if pncconf suggested a 1 ms servo-thread period, it did the right thing.

If you try to run with a servo-thread period of 7,000 nanoseconds you'll 
have a bad time, because the servo thread generally takes longer than 
that to run.  So the servo-thread will be unhappy because it doesn't get 
to run as often as you told it to, and the rest of the system will be 
unhappy because there won't be any time for anything *other* than the 
servo-thread.

It's that "no time for anything else" part that caused the hang when you 
start LinuxCNC.

You can see how long the servo-thread takes to do its job by starting 
LinuxCNC, then running (in a terminal window): halcmd show thread

The "Max-Time" is the longest the servo-thread has taken to run (so far, 
it might be more in the future, depending on what it's doing).  If you 
have a servo-thread period that's shorter than that max-time things 
aren't going to work well, and if the period is *close* to the thread's 
max-time there won't be much CPU left over for doing other things (like 
running your GUI and the rest of your Linux system).


-- 
Sebastian Kuzminsky

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[andy pugh]

On 10 April 2017 at 16:37, Jon Elson  wrote:
> If the condenser pressure is too
> low, you won't get any liquid at all, and the Carnot process
> turns into a really ineffective Brayton (all gas) process.

I am impressed that someone managed to come up with this cycle:
http://www.cs.cmu.edu/~mnr/fridge.html


-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Valerio Bellizzomi]

On Mon, 2017-04-10 at 16:30 +0100, andy pugh wrote:
> On 10 April 2017 at 15:52, Valerio Bellizzomi  wrote:
> > Running the servo jitter test program shows a value of around 6000-7000,
> > but the default is 100 !
> 
> That's because a 1mS servo thread is about right for most machines.
> Just about the only time that you would need to go faster in the base
> thread is if you are doing brushless motor commutation in software.
> 

Yes the latency-test, it shows a figure of around 6000-7000 but when I
use that in the config, linuxcnc doesn't start, and the dmesg shows a
consistent number of messages related to a cpu being stuck




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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Jon Elson]

On 04/10/2017 05:47 AM, Roland Jollivet wrote:
> Intriguing.
> But.. you can burn out the compressor if you run with no or little gas, as
> the compressor itself cannot dissipate sufficient heat. It needs gas to
> carry the heat away to the condensor. The condensor is part of the cooling
> system for the compressor..
> Also, even while there is little gas, it can still produce ice, if you look
> at the phase chart of the gas. The ice is usually closer to the evaporation
> valve.
>
A refrigerator (at least in the US) will use a capillary 
tube, not a thermal expansion valve.

Jon

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Kirk Wallace]

On 04/09/2017 09:16 PM, Kirk Wallace wrote:

... snip

> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?

... snip

Roland, Dave, Ray, thank you for your replies. We have had a neighbor in 
the HVAC business top up the R-12 and have gotten away with it for quite 
a few years. The unit is a Sub-Zero 532 built-in, so it would not be 
easy to replace with a standard box.
> https://appliancebuyersguide.com/sub-zero-532-replacing-an-old-or-broken-subzero/

I have been researching the Net to learn how to convert to R-134, find 
leaks and replace the evaporator (normally > $800, part ~$110) myself. 
After watching a few Youtube videos, I am now an expert :). This seems 
to be the best resource so far (click the Look Inside to see the good 
stuff):
> https://www.amazon.com/Refrigeration-Conditioning-Technology-John-Tomczyk/dp/1305578295

Good videos:
https://www.youtube.com/watch?v=pCv7rCdcXsc  (a few in series)
https://www.youtube.com/user/KenTraining/videos  (interesting channel)

I figure the worst case is, I buy a modern used refrigerator and 
transfer all the bits to the S-Z. After I acquire all the tools, I can 
also fix the Explorer and a window unit. I'm also thinking it would be 
cool to add a Linux IoT WiFi thingie with a bunch of sensors to 
monitor... well everything. The original refrigerator didn't even have a 
thermometer. I only knew things weren't going well when the fresh 
veggies went bad after only a few days. I'm keen to fix that.

Sorry if this is noise.

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Jon Elson]

On 04/09/2017 11:16 PM, Kirk Wallace wrote:
>   I recently verified that the
> thermostat works and that the compressor is basically on all of the
> time. I got to thinking this is a waste of electricity for something
> that barely works,
Yes, you really should replace it.  Refrigerators that are 
working PROPERLY are one of the largest energy consumers in 
the house.
>   so I asked myself "if I add more ice and turn the
> thermostat off, will it still be cold enough?"
>
> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?
The ice jugs may be blocking air flow and preventing it from 
cooling.  Also, you could have ice buildup on the coils, 
etc. or ice-saturated insulation that is fouling up the process.
> My thinking is that the compressor is pumping whatever is still in the
> system, which has no cooling effect, from the room temperature condenser
> into the evaporator which then heats the ice in the cabinet.
>
>
Refrigerators use capillary tube regulation of liquid flow 
to the evaporator.  This requires condenser pressure within 
a certain range for the capillary to flow the right amount.  
It is a major compromise.  If the condenser pressure is too 
low, you won't get any liquid at all, and the Carnot process 
turns into a really ineffective Brayton (all gas) process.

Jon

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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[andy pugh]

On 10 April 2017 at 15:52, Valerio Bellizzomi  wrote:
> Running the servo jitter test program shows a value of around 6000-7000,
> but the default is 100 !

That's because a 1mS servo thread is about right for most machines.
Just about the only time that you would need to go faster in the base
thread is if you are doing brushless motor commutation in software.

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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Gene Heskett]

On Monday 10 April 2017 10:52:29 Valerio Bellizzomi wrote:

> On Mon, 2017-04-10 at 15:46 +0200, Valerio Bellizzomi wrote:
> > Followup: the issue was in the servo jitter value. Looking at dmesg
> > there are a consistent number of messages indicating that one cpu
> > was stuck, and other messages about hm2. Now I have left the default
> > untouched and Axis starts.
>
> Ok, but I am not sure the default is an actual good value. I will
> leave that for when I try to drive a motor.
>
> Running the servo jitter test program shows a value of around
> 6000-7000, but the default is 100 !
>
If you are referring to "latency-test" those are good figures for a 
machine with smart i/o, such as a Mesa card.  Thats a 6 or 7 microsecond 
jitter, and usefull even for software stepping as long as you don't push 
the rapids too fast.
>
>
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Cheers, Gene Heskett
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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Valerio Bellizzomi]

On Mon, 2017-04-10 at 15:46 +0200, Valerio Bellizzomi wrote:
> Followup: the issue was in the servo jitter value. Looking at dmesg
> there are a consistent number of messages indicating that one cpu was
> stuck, and other messages about hm2. Now I have left the default
> untouched and Axis starts.


Ok, but I am not sure the default is an actual good value. I will leave
that for when I try to drive a motor.

Running the servo jitter test program shows a value of around 6000-7000,
but the default is 100 !




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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[jrmitchellj .]

Likely the heat generated by the running compressor is what is heating the
cabinet.
Without refrigerant, no way to move the heat to the condenser.

Ray

--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573


The dogmas of the quiet past, are inadequate to the stormy present. The
occasion is piled high with difficulty, and we must rise with the occasion.
As our case is new, so we must think anew and act anew. We must disenthrall
ourselves, and then we shall save our country.*Abraham Lincoln
*, *Annual message
to Congress, December 1, 1862*
*16th president of US (1809 - 1865)*

On Sun, Apr 9, 2017 at 9:16 PM, Kirk Wallace 
wrote:

> While I think of a tie-in to LinuxCNC, here is the story. I have a
> refrigerator that has a very slow leak which requires us to recharge the
> system after several months. On a new charge, it works great, then I
> need to turn the thermostat up a bit at a time, when that doesn't work,
> I add plastic jugs of ice from the freezer section, but eventually this
> barely keeps the cabinet cold enough. I recently verified that the
> thermostat works and that the compressor is basically on all of the
> time. I got to thinking this is a waste of electricity for something
> that barely works, so I asked myself "if I add more ice and turn the
> thermostat off, will it still be cold enough?"
>
> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?
>
> My thinking is that the compressor is pumping whatever is still in the
> system, which has no cooling effect, from the room temperature condenser
> into the evaporator which then heats the ice in the cabinet.
>
> Maybe?
>
> Like my refrigerator, LinuxCNC can produce unexpected results. (a
> gossamer thread tie-in)
>
> --
> Kirk Wallace
> http://www.wallacecompany.com/machine_shop/
> http://www.wallacecompany.com/E45/
>
> 
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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Valerio Bellizzomi]

Followup: the issue was in the servo jitter value. Looking at dmesg
there are a consistent number of messages indicating that one cpu was
stuck, and other messages about hm2. Now I have left the default
untouched and Axis starts.




On Mon, 2017-04-10 at 14:50 +0200, Valerio Bellizzomi wrote:
> Ok then it should be some config issue, I will investigate further.
> 
> 
> 
> 
> 
> 
> On Mon, 2017-04-10 at 05:01 -0700, andypugh wrote:
> > The Mesa drivers are built-in to LinuxCNC, no extra config should be 
> > needed. 
> > Can we move this to the forum? 
> > 
> > -- 
> > You are receiving this because you authored the thread.
> > Reply to this email directly or view it on GitHub:
> > https://github.com/LinuxCNC/linuxcnc/issues/256#issuecomment-292929173
> 
> 
> 
> 
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Re: [Emc-users] Way OT, Unexpected Result from Refrigerator

[Dave Cole]

FWIW, the local utility will give me $100 for an old running fridge that 
is an energy waster.
So cash in your old fridge that still "runs".   And buy another off 
craigslist.   :-)

Dave

On 4/10/2017 6:47 AM, Roland Jollivet wrote:
> Intriguing.
> But.. you can burn out the compressor if you run with no or little gas, as
> the compressor itself cannot dissipate sufficient heat. It needs gas to
> carry the heat away to the condensor. The condensor is part of the cooling
> system for the compressor..
> Also, even while there is little gas, it can still produce ice, if you look
> at the phase chart of the gas. The ice is usually closer to the evaporation
> valve.
>
>
>
> On 10 April 2017 at 06:16, Kirk Wallace  wrote:
>
>> While I think of a tie-in to LinuxCNC, here is the story. I have a
>> refrigerator that has a very slow leak which requires us to recharge the
>> system after several months. On a new charge, it works great, then I
>> need to turn the thermostat up a bit at a time, when that doesn't work,
>> I add plastic jugs of ice from the freezer section, but eventually this
>> barely keeps the cabinet cold enough. I recently verified that the
>> thermostat works and that the compressor is basically on all of the
>> time. I got to thinking this is a waste of electricity for something
>> that barely works, so I asked myself "if I add more ice and turn the
>> thermostat off, will it still be cold enough?"
>>
>> It turns out, without adding more ice the cabinet actually got cooler by
>> 5 degrees. Uhh?
>>
>> My thinking is that the compressor is pumping whatever is still in the
>> system, which has no cooling effect, from the room temperature condenser
>> into the evaporator which then heats the ice in the cabinet.
>>
>> Maybe?
>>
>> Like my refrigerator, LinuxCNC can produce unexpected results. (a
>> gossamer thread tie-in)
>>
>> --
>> Kirk Wallace
>> http://www.wallacecompany.com/machine_shop/
>> http://www.wallacecompany.com/E45/
>>
>> 
>> --
>> 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] Doubt about mesa config

[Valerio Bellizzomi]

Hello,
The mesa 6i25 has a W1 jumper, should it be enabled or disabled?




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Re: [Emc-users] [LinuxCNC/linuxcnc] linuxcnc does not start with mesa board (#256)

[Valerio Bellizzomi]

Ok then it should be some config issue, I will investigate further.






On Mon, 2017-04-10 at 05:01 -0700, andypugh wrote:
> The Mesa drivers are built-in to LinuxCNC, no extra config should be needed. 
> Can we move this to the forum? 
> 
> -- 
> You are receiving this because you authored the thread.
> Reply to this email directly or view it on GitHub:
> https://github.com/LinuxCNC/linuxcnc/issues/256#issuecomment-292929173




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[Emc-users] Way OT, Unexpected Result from Refrigerator

[Roland Jollivet]

Intriguing.
But.. you can burn out the compressor if you run with no or little gas, as
the compressor itself cannot dissipate sufficient heat. It needs gas to
carry the heat away to the condensor. The condensor is part of the cooling
system for the compressor..
Also, even while there is little gas, it can still produce ice, if you look
at the phase chart of the gas. The ice is usually closer to the evaporation
valve.



On 10 April 2017 at 06:16, Kirk Wallace  wrote:

> While I think of a tie-in to LinuxCNC, here is the story. I have a
> refrigerator that has a very slow leak which requires us to recharge the
> system after several months. On a new charge, it works great, then I
> need to turn the thermostat up a bit at a time, when that doesn't work,
> I add plastic jugs of ice from the freezer section, but eventually this
> barely keeps the cabinet cold enough. I recently verified that the
> thermostat works and that the compressor is basically on all of the
> time. I got to thinking this is a waste of electricity for something
> that barely works, so I asked myself "if I add more ice and turn the
> thermostat off, will it still be cold enough?"
>
> It turns out, without adding more ice the cabinet actually got cooler by
> 5 degrees. Uhh?
>
> My thinking is that the compressor is pumping whatever is still in the
> system, which has no cooling effect, from the room temperature condenser
> into the evaporator which then heats the ice in the cabinet.
>
> Maybe?
>
> Like my refrigerator, LinuxCNC can produce unexpected results. (a
> gossamer thread tie-in)
>
> --
> Kirk Wallace
> http://www.wallacecompany.com/machine_shop/
> http://www.wallacecompany.com/E45/
>
> 
> --
> 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] old JA14 .. tedious problem cnt't do that emc_traj_enable_teleop ...

[giorgio foga]

I Have an old machine with Lcnc 2.8 and ja14  I use it for testing my comp 
modbus ... I tried in some way to remove this annoying error message than the 
TeleOp jumping out whenever I pause a program or that I finish a mdi command 
stand-alone  I have not tried the component on my new ubuntu 16.04 with the 
new master  so I have no evidence ... but I'd like to know how to remove 
this error ... the error comes out although I use the machine only with axis 
gui without my modbus component that pc is too tiny for install a 16.04 or 
debian 8.


any suggestions would be appreciated.

regards

Giorgio

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[Emc-users] halui.max-velocity ...

[giorgio foga]

using JA I try to send halui.max-velocity.decrease/increase trought modbus  
after more test I see it work well but the result is unespected for my config. 
With axis gui I have max-velocity slider that show 21mm/min max velocity 
... it is ok ... but if I use setp halui.max-velocity.scale .. i try for 
test these value 100-10-1  and It seems it not working well, but when I try 
to use 0.1 and 0.01 I see it work perfect but with undesired result  in the 
past after any test th max-velocity, after press  pycp.button -> 
halui.max-velocity.decrease ... the max-value on axis gui go to 60.0 and it 
stop  using scale = 0.1 or 0.01 I see the max-value and slider on axis gui 
goto 60, 59, 58... or 59.9, 59.8, 59.7 etc etc... So I see it work but why it 
go from 21 (my right value) to 60.0??? I control axis.py file to undestand 
why but I have notn see anything at odds to my config.


I use angular and linear axis too  obviusly I not seeing the right things.


regards

Giorgio
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