Re: [Emc-users] Mux_generic

[a k]

Hi
i am interesting if you make mux_generic work
in reality this software 2.6.4 only 4 month old and maybe has problems in
it.

i also trying to use mux_generic and problem mux-gen.00.out  -no such pin

On Fri, Nov 28, 2014 at 5:47 AM, Eric H. Johnson 
wrote:

> Andy et al,
>
> Is mux_generic in the current binaries? I am getting "can't find module".
>
> Thanks,
> Eric
>
>
>
> Sent from Samsung Mobile
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Re: [Emc-users] Real time scheduling

[TJoseph Powderly]

On 12/25/2014 04:06 AM, Karlsson & Wang wrote:
> Then trying to get a system which is robust to communication errors I 
> investigated the scheduling and found out that Earliest Deadline First 
> scheduling quite recently have been part of the ordinary kernel. I have seen 
> linuxcnc currently use "SCHED_FIFO" and the new is "SCHED_DEADLINE" which use 
> the Earliest Deadline First scheme.
>
> Here are two links to scheduling schemes which may contain a useful 
> background or introduction to the topic:
> http://en.wikipedia.org/wiki/Earliest_deadline_first_scheduling
> http://en.wikipedia.org/wiki/Rate-monotonic_scheduling
>
>
>
>
> Nicklas Karlsson
>
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Hello Nicklaus
Merry Christmas & Happy New Year
your information is very interesting
but please
send such technical information to the developers list

emc-develop...@lists.sourceforge.net

HTH
TomP tjtr33


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[Emc-users] Good URL to look up auto-technology motor specs?

[Gene Heskett]

Greetings;

The function generator arrived today, so I have the potential PSU, one 
2M542 driver, and an A.T. KL23H266-20-8B motor setup to test how is the 
best way to run it.

The first thing I notice is that its maximum current draw, when the driver 
is set for a hair under 2 amps, is actually at about 350 rpm.  I think my 
Greenlee digital amprobe fades below that frequency, and I have no clue 
what its response when the excitation frequency is well above 60hz.

Anyway, with 46 volts available, with this 8 wire  motor wired for series 
as a 4 wire, nominally 1.81 amps of drive according the the dip switch 
chart on the driver, and the rpm divisor set at 6400/rev, I can drive it 
to somewhat above 300Khz giving a hair over 2812 rpm.  But the inductance 
sure seems to be crippling it as it is only drawing about .43 amps at that 
speed. So I may go back out and see how it runs wired in parallel.

I also note that the opto's in the driver are about done at 750Khz when 
its set for a 25600 per rev divisor.  The motor stops and doesn't even 
squeek when its sitting there stalled.  Its just locked up as if the drive 
failed.

But I haven't tried it as a paralleled coil drive yet.

But I'd sure like to find an AT chart showing this motors nominal 
performance.  I struck out at www.automationtechnology.com, getting the 
impression I was not even on the right companies site.

Has anyone a better URL?

Thanks everybody.

Cheers, Gene Heskett
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Re: [Emc-users] Persistently storing HAL pin value

[Alexander Rössler]

On Wednesday 24 December 2014 09:20:05 schoone...@btinternet.com wrote:
> Hi Alex
> 
> >> Seb wrote:
> >> If you're making a userspace component (as opposed to a realtime
> >> component), you can just use fopen/fwrite/fclose to persist the values
> >> when they change, and fopen/fread/fclose at startup to restore them.
> 
> My component was called paramsaver, that is what it did, except that it
> created pins to match the data types, which could be linked to pyVCP
> widgets or whatever and it both saved and initialised values through the
> linked pins
> 
> You can find it at mgwareDOTcoDOTuk > HAL Components > Paramsaver
That was exactly what I was looking for. Thank you very much.

Regards
Alexander

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[Emc-users] Real time scheduling

[Karlsson & Wang]

Then trying to get a system which is robust to communication errors I 
investigated the scheduling and found out that Earliest Deadline First 
scheduling quite recently have been part of the ordinary kernel. I have seen 
linuxcnc currently use "SCHED_FIFO" and the new is "SCHED_DEADLINE" which use 
the Earliest Deadline First scheme.

Here are two links to scheduling schemes which may contain a useful background 
or introduction to the topic:
http://en.wikipedia.org/wiki/Earliest_deadline_first_scheduling
http://en.wikipedia.org/wiki/Rate-monotonic_scheduling




Nicklas Karlsson

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Re: [Emc-users] 3 phase washing machine motor

[Karlsson & Wang]

If it is an induction motor which is probably the cheapest to build slip 
between electrical speed and mechanical speed will depend on load. In this kind 
of motors there are no magnets and the magnetic field is developed by the slip.

Nicklas Karlsson



On Sat, 27 Dec 2014 08:00:04 +
Marcus Bowman  wrote:

> I've just taken a similar motor form our (now dead) washing machine. I took 
> the whole harness and all the electronics from the machine, so I may be able 
> to get it on the bench and give it a push and a prod sometime. 
> It seems to me that the motor rpm is greatly affected by the load. My 
> knowledge gets sketchy at this point, but I have read of control/regulation 
> being via back emf, used in a feedback loop inside the controller. What 
> puzzles me is how rpm and feedback seem detached under no-load conditions.
> Nice motors, though.
> Mine is labelled C. E. SET and its 800W 17000rpm.
> The controller was made by Jabil Circuit who used to have a factory about 3 
> miles from here.
> The washing machine was a Hotpoint. We've had several, and they are not that 
> great. But I have to say that when I took it apart, the engineering design of 
> many of the components impressed me greatly. All that clever design to make 
> the thing easy and cheap to manufacturer. The drum mouldings are worthy of a 
> design museum.
> 
> What controller are you using?
> 
> Marcus
> 
> 
> On 23 Dec 2014, at 23:37, richsh...@comcast.net wrote:
> 
> > Well, I dug through the pumphouse, found an Automation Direct GS1 drive, 
> > hooked it up. set the upper frequency for 400HZ. and it works! This 
> > motor has a nameplate indicating it as a 0.8KW sized motor, about 1HP for 
> > some of the audience. Should be very cheap to pick up. Next step is to get 
> > the 17,000 rpm motor speed down to something useful. 
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