Re: [Emc-users] Forum down?

[Jon Elson]

On 05/24/2017 03:48 PM, Sebastian Kuzminsky wrote:
> I see in the logs that there was a period of high web 
> activity, starting about 15:09 EDT and ending just 
> recently, at 16:40 EDT. During that time the machine 
> exhausted its 1 GB of RAM and went 2 GB into swap, which 
> causes very high latency. If this was a CNC machine it 
> would have E-stopped with a following error. Debugging 
> continues... 
Periodically, some tentacle of Baiduspider starts hammering 
my Pico Systems web server.  I use goaccess to
format and analyze the activity, or just grep on the log 
files. Whenever they get past about 50K GETs per day, I
set up an iptable entry to block them.  This used to come up 
every couple months when they moved to a new set of IP 
addresses.  About due for the next wave from them.

Jon

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Re: [Emc-users] [SPAM] Re: Induction heating small parts

[Dave Cole]

Andy, did you acquire those tankards from the local pewter tankard 
recycling center?And you volunteered to help with repairs?

Unusual..   Likely so.   :-)

Dave


On 5/24/2017 7:07 PM, andy pugh wrote:
> So, I got one of these, and it is fun.
>
> But, I want to use it to heat the bases of pewter tankards to
> de-solder a ring and replace broken glass bases.
>
> I have about 100 to fix. I sometimes wonder if I lead an unusual life. :-)
>
> Anyway, to do that job (and I have proved that the supplied coil does
> melt pewter, even though it does not couple as efficiently as iron) I
> would need a much bigger and shallower coil.
>
> Are these cheap devices tuned for the supplied coil, or will they
> auto-tune to any coil?
>

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Re: [Emc-users] [SPAM] Re: Induction heating small parts

[Gene Heskett]

On Wednesday 24 May 2017 19:07:31 andy pugh wrote:

> So, I got one of these, and it is fun.
>
> But, I want to use it to heat the bases of pewter tankards to
> de-solder a ring and replace broken glass bases.
>
> I have about 100 to fix. I sometimes wonder if I lead an unusual life.
> :-)

I've been there, done that in a past life in the 1960's.

> Anyway, to do that job (and I have proved that the supplied coil does
> melt pewter, even though it does not couple as efficiently as iron) I
> would need a much bigger and shallower coil.
>
> Are these cheap devices tuned for the supplied coil, or will they
> auto-tune to any coil?

The supplied coil is part of the tuning element, Andy. I would wind 
another from the same 1/4" or 6mm OD pipe, but big enough to couple to 
the pewter fairly close, and at the change in diameter, I'd add 3 or 4 
turns to re-gain some of the inductance lost by making it bigger.  
Measure its frequency (I'm told to have the iron in the coil at power 
up, which must be a hard switch in order to get it started correctly 
else the magic smoke comes out of the transistors.)  Set the new coil 
around the tankard, turn it on and measure the frequency again, which 
should be -25, +25 % of the original frequency. Probably it will be high 
because whereas the iron adds inductance and slows it down while the 
iron is below austenitic temps, the pewter is non-ferrous from the gitgo 
and will reduce the inductance even when cold.  If off high by a lot 
more, add 2 turns to the next coil you make, or if lower, take one turn 
off of the new one until its running in the same ballpark.  What you 
want is a circuit that runs at a high enough frequency to couple well to 
the pewter, without running so fast its spends a lot of time in the 
switching transition between full on and full off because the 
transistors aren't fast enough, which will run the transistor heating 
thru the roof, sometimes in very little time.  That of course breaks the 
magic mirror and lets all the smoke out. :(

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] [SPAM] Re: Induction heating small parts

[andy pugh]

So, I got one of these, and it is fun.

But, I want to use it to heat the bases of pewter tankards to
de-solder a ring and replace broken glass bases.

I have about 100 to fix. I sometimes wonder if I lead an unusual life. :-)

Anyway, to do that job (and I have proved that the supplied coil does
melt pewter, even though it does not couple as efficiently as iron) I
would need a much bigger and shallower coil.

Are these cheap devices tuned for the supplied coil, or will they
auto-tune to any coil?

-- 
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] Forum down?

[andy pugh]

On 24 May 2017 at 23:04, Marcus Bowman
 wrote:
> Do we need a whip-round to get some additional memory?

I doubt money is the problem, it isn't like this is a pauper's hobby.

Though I would be curious to know what technical limitation it might be.

-- 
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] Forum down?

[Marcus Bowman]

On 24 May 2017, at 21:48, Sebastian Kuzminsky wrote:

> On 05/24/2017 02:20 PM, Bengt Sjölund wrote:
>> And again forum is down, what is going on?
>> 
>> Anybody having insight in what is happening?
>> 
>> 
>> Cheers
>> 
>> Bengt
> 
> The forum currently works for me.
> 
> We've been monitoring the forum more closely lately, to try to track 
> down the flakiness.  It seems to be caused by periods of 
> higher-than-usual load on the machine that serves the forum.
> 
> I see in the logs that there was a period of high web activity, starting 
> about 15:09 EDT and ending just recently, at 16:40 EDT.  During that 
> time the machine exhausted its 1 GB of RAM and went 2 GB into swap, 
> which causes very high latency.  If this was a CNC machine it would have 
> E-stopped with a following error.
> 

Do we need a whip-round to get some additional memory?

Marcus

> Debugging continues...
> 
> 
> -- 
> Sebastian Kuzminsky
> 
> --
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Re: [Emc-users] Forum down?

[Bengt Sjölund]

Thanks for the update.

Hope you can find a solution to this annoying problem.
Keep up the fine work that is much appreciated.

Cheers
Bengt


Den 2017-05-24 kl. 22:48, skrev Sebastian Kuzminsky:
> On 05/24/2017 02:20 PM, Bengt Sjölund wrote:
>> And again forum is down, what is going on?
>>
>> Anybody having insight in what is happening?
>>
>>
>> Cheers
>>
>> Bengt
> The forum currently works for me.
>
> We've been monitoring the forum more closely lately, to try to track
> down the flakiness.  It seems to be caused by periods of
> higher-than-usual load on the machine that serves the forum.
>
> I see in the logs that there was a period of high web activity, starting
> about 15:09 EDT and ending just recently, at 16:40 EDT.  During that
> time the machine exhausted its 1 GB of RAM and went 2 GB into swap,
> which causes very high latency.  If this was a CNC machine it would have
> E-stopped with a following error.
>
> Debugging continues...
>
>


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Re: [Emc-users] Forum down?

[Sebastian Kuzminsky]

On 05/24/2017 02:20 PM, Bengt Sjölund wrote:
> And again forum is down, what is going on?
>
> Anybody having insight in what is happening?
>
>
> Cheers
>
> Bengt

The forum currently works for me.

We've been monitoring the forum more closely lately, to try to track 
down the flakiness.  It seems to be caused by periods of 
higher-than-usual load on the machine that serves the forum.

I see in the logs that there was a period of high web activity, starting 
about 15:09 EDT and ending just recently, at 16:40 EDT.  During that 
time the machine exhausted its 1 GB of RAM and went 2 GB into swap, 
which causes very high latency.  If this was a CNC machine it would have 
E-stopped with a following error.

Debugging continues...


-- 
Sebastian Kuzminsky

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Re: [Emc-users] Forum down?

[Bengt Sjölund]

And again forum is down, what is going on?

Anybody having insight in what is happening?


Cheers

Bengt


Den 2017-05-10 kl. 08:50, skrev Bengt Sjölund:
> And down again.
>
> Cheers
> Bengt
>
>
> Den 2017-05-09 kl. 15:58, skrev John Thornton:
>> I had to power cycle it this morning around 5am central time.
>>
>> JT
>>
>>
>> On 5/9/2017 7:24 AM, Sebastian Kuzminsky wrote:
>>> It's up from here.
>>>
>>> http://isup.me/forum.linuxcnc.org
>>>
>>>
>>> On May 9, 2017 1:49:45 AM MDT, "Bengt Sjölund"  wrote:
 And down again!

 What is it with the forum that goes down very often?

 Cheers
 Bengt


 Den 2017-04-30 kl. 19:58, skrev Jon Elson:
> On 04/29/2017 04:26 PM, Jon Elson wrote:
> And, it seems to be back up!
>
>   Thanks,
>
> Jon
>
>
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Re: [Emc-users] Thing with a square hole

[Eric Keller]

Those are really nice.  I have some harmonic drives from a robot.  I have
always thought I have enough structure left over from the robot to make a
4th axis, but I really like your casting. They have mating DC motors and
the pinout is right there on the motor.

There used to be a foundry fairly close to here that would do one-off jobs,
but I have doubts that they are still around

On Wed, May 24, 2017 at 8:15 AM, andy pugh  wrote:

> On 24 May 2017 at 09:13, Marcus Bowman
>  wrote:
> > Which foundry did you use?
>
> AJD in Brierley Hill. He seems happiest doing one-offs.
> https://plus.google.com/117843202793672038457
>
>
> --
> 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] Thing with a square hole

[andy pugh]

On 24 May 2017 at 09:13, Marcus Bowman
 wrote:
> Which foundry did you use?

AJD in Brierley Hill. He seems happiest doing one-offs.
https://plus.google.com/117843202793672038457


-- 
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] Thing with a square hole

[John Figie]

Thanks for sharing your work.  It looks really nice and professional.  You
are ambitious.

On May 24, 2017 3:20 AM, "Marcus Bowman" <
marcus.bow...@visible.eclipse.co.uk> wrote:

>
> On 24 May 2017, at 08:29, andy pugh wrote:
>
> > On 23 March 2017 at 01:23, hubert  wrote:
> >>I really like your Idea of using the Cam lock approach for a 4Axis
> >> chuck adapter.
> >
> > FWIW, I have this mechanically complete now:
> > http://bodgesoc.blogspot.de/2017/05/harmonic.html
> >
>
> Nice work. I had investigated the harmonic drives but was put off by the
> fearful price. I see they are available in low cost Chinese 4th axes, but I
> suppose you get what you pay for, as ever.
>
> Which foundry did you use?
>
> Marcus
>
> > --
> > 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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>
> 
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Re: [Emc-users] Thing with a square hole

[Marcus Bowman]

On 24 May 2017, at 08:29, andy pugh wrote:

> On 23 March 2017 at 01:23, hubert  wrote:
>>I really like your Idea of using the Cam lock approach for a 4Axis
>> chuck adapter.
> 
> FWIW, I have this mechanically complete now:
> http://bodgesoc.blogspot.de/2017/05/harmonic.html
> 

Nice work. I had investigated the harmonic drives but was put off by the 
fearful price. I see they are available in low cost Chinese 4th axes, but I 
suppose you get what you pay for, as ever.

Which foundry did you use?

Marcus

> -- 
> 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] Thing with a square hole

[andy pugh]

On 23 March 2017 at 01:23, hubert  wrote:
> I really like your Idea of using the Cam lock approach for a 4Axis
> chuck adapter.

FWIW, I have this mechanically complete now:
http://bodgesoc.blogspot.de/2017/05/harmonic.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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