[Emc-users] mesa card choice and config

[Claude Froidevaux]

Hi,

I may have a nice project of retrofitting a lathe (about 20kW, quite a 
nice toy, but with an old control that is dead)

I tested servo driver, they work. So basicely, all I need is:

- 3 output +- 10V (to give speed consign to servo amplifier)
- 4 quadrature input encoder (I checked this, its a 1micron 1 increment, 
pretty simple), 1 channel is for MPG, another for spindle position

this shall do the job for the main axis, then I still have the tool 
changer, but it seems pretty straightforward (a bunch of IO to drive in 
the required sequence). Of course there is a lot a digital IO, but I 
have schematics, thus is seem pretty straiforward as well.

I would also love to have analog input on MESA card, but this does not 
seems to exist. anyone to confirm ?  (use would be load monitoring, 
spindle speed override, axis speed override, I can do this really simply 
with a small USB card, I did not need real-time capabliites)

Idea is to use MESA 7I33TA for +-10V out and quadrature inputs, and 7i37 
or similar for digital input/ouput. What card shall I use assuming a PCI 
or PCIe port ? i would like to work with the 5i24-16 or 5i24-25, but 
there is no information ( or I did not find any). As much as I 
understand, these card use FPGA to make PCI interface, as opposite to 
5i20 for example, where there is a dedicaced chip for this. Is there 
LinuxCNC support for the new generation board  (5i24, 6i24 ) ?

Best regards








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Re: [Emc-users] mesa card choice and config

[andy pugh]

On 21 January 2016 at 16:53, Claude Froidevaux  wrote:

> I would also love to have analog input on MESA card, but this does not
> seems to exist. anyone to confirm ?

Some of the smart-serial cards offer analogue input on some channels.

> Idea is to use MESA 7I33TA for +-10V out and quadrature inputs, and 7i37
> or similar for digital input/ouput. What card shall I use assuming a PCI
> or PCIe port ? i would like to work with the 5i24-16 or 5i24-25, but
> there is no information ( or I did not find any)

I am using a 6i24 on my current build.
You might want to consider a 7i33TA for high-speed IO and then add a
7i44 to connect a selection of smart-serial cards.
For example, a 7i73 for the control panel can very much simplify control wiring.

I am using a 7i84 (smart serial) for digital IO, and that also offers
some MPG counters and 4 channels of analogue input (at 8 bit
resolution).
If you want more accurate analogue input then there is the 7i87 (also
smart-serial, 10 channels, 12 bit) but for a load meter 8 bits is
probably adequate.

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Re: [Emc-users] mesa card choice and config

[John Kasunich]

That is not true at all.

LinuxCNC supports a fairly wide range of I/O devices.

Jon Elson offers a line of products that we have drivers for.

We also have drivers for a couple of older servo boards, but the manufacturers
of those boards haven't been keeping up with the changes in the computer world.

Mesa is popular for several reasons:
1) they are a forward looking company who are actively developing new products
2) they are committed to open source and help the Linux CNC team write drivers
3) their products are very competitive on price
4) they have great support - Pete from Mesa regularly reads this list

Do you know of anyone else who is offering products that LinuxCNC should 
support?
If so, share the company and links to the products.

Writing a driver for an I/O board varies from reasonably simple to very complex,
based on the I/O board design and level of documentation.  The manufacturer
can write a driver, they can encourage (possibly with $$) someone else to write
a driver, or they can simply hope someone wants to use their board and will
write a driver.



On Thu, Jan 21, 2016, at 01:41 PM, John Dammeyer wrote:
> I'm a little puzzled.  
> 
> Lately the discussion on servos and LinuxCNC appears to give the impression
> that the only solution is a PC and boards from Mesa.  Does that mean
> LinuxCNC has now become a defacto Mesa product? 
> 
> Either stepper motors and an older PC that supports parallel port or if you
> want servos that aren't driven with a Gecko Step/Dir input (much like a
> stepper motor) then it's a Mesa product or nothing? 
> 
> John Dammeyer


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Re: [Emc-users] mesa card choice and config

[Andrew]

2016-01-21 18:53 GMT+02:00 Claude Froidevaux :

> Hi,
>
> I may have a nice project of retrofitting a lathe (about 20kW, quite a
> nice toy, but with an old control that is dead)
>
> I tested servo driver, they work. So basicely, all I need is:
>
> - 3 output +- 10V (to give speed consign to servo amplifier)
> - 4 quadrature input encoder (I checked this, its a 1micron 1 increment,
> pretty simple), 1 channel is for MPG, another for spindle position
>
> this shall do the job for the main axis, then I still have the tool
> changer, but it seems pretty straightforward (a bunch of IO to drive in
> the required sequence). Of course there is a lot a digital IO, but I
> have schematics, thus is seem pretty straiforward as well.
>
> I would also love to have analog input on MESA card, but this does not
> seems to exist. anyone to confirm ?  (use would be load monitoring,
> spindle speed override, axis speed override, I can do this really simply
> with a small USB card, I did not need real-time capabliites)
>
> Idea is to use MESA 7I33TA for +-10V out and quadrature inputs, and 7i37
> or similar for digital input/ouput. What card shall I use assuming a PCI
> or PCIe port ? i would like to work with the 5i24-16 or 5i24-25, but
> there is no information ( or I did not find any). As much as I
> understand, these card use FPGA to make PCI interface, as opposite to
> 5i20 for example, where there is a dedicaced chip for this. Is there
> LinuxCNC support for the new generation board  (5i24, 6i24 ) ?
>
> 5i25 + 7i77 set is widely used for analog control... 6 analog outputs, 6
encoder channels, 32 inputs, 16 outputs.
For analog inputs, MPG, some IO, matrix keyboard and LCD you can use 7i73
serial card.
For more IO there are remote serial cards.
Also, the second DB25 connector on 5i25 can be used for some buttons etc.
(at least that's what I'm going to do).

Andrew
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[Emc-users] mesa card choice and config

[Mark Johnsen]

7i87 is a +-10vdc analog input card.  Connects on the sserial connectors of
say a 7i77.
http://store.mesanet.com/index.php?route=product/product_id=126

There's at least 3 ways to use a 7i77.  I think pci 5i25, pcie 6i25 and
ethernet (7i80 or something close to that).

http://store.mesanet.com/index.php?route=product/product_name=7i80_id=59
There are 2 7i80's (-16 and -25), not sure of the difference.

Seems like a 7i77 would solve a bunch of your input/output req'ts.

Many options.
Mark

From: Andrew 
> Subject: Re: [Emc-users] mesa card choice and config
> To: "Enhanced Machine Controller (EMC)"
> 
> Message-ID:
> 

Re: [Emc-users] mesa card choice and config

[John Dammeyer]

I'm a little puzzled.  

Lately the discussion on servos and LinuxCNC appears to give the impression
that the only solution is a PC and boards from Mesa.  Does that mean
LinuxCNC has now become a defacto Mesa product? 

Either stepper motors and an older PC that supports parallel port or if you
want servos that aren't driven with a Gecko Step/Dir input (much like a
stepper motor) then it's a Mesa product or nothing? 

John Dammeyer




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Re: [Emc-users] mesa card choice and config

[andy pugh]

On 21 January 2016 at 18:41, John Dammeyer  wrote:

> Either stepper motors and an older PC that supports parallel port or if you
> want servos that aren't driven with a Gecko Step/Dir input (much like a
> stepper motor) then it's a Mesa product or nothing?

Not at all.

The Pico solutions are well supported:
http://www.pico-systems.com/motion.html

And there is a new(ish) product line from General Mechatronics:
http://www.generalmechatronics.com/en/linuxcnc

And the Motenc:
http://www.vitalsystem.com/web/motion/motionLite.php

And Servo-to-Go
http://www.servotogo.com/index.shtml

Are still supported by LinuxCNC drivers.

However, the question asked was "What Mesa cards can I use" so I
suggested Mesa cards.

There are actually rather more options than listed here:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Hardware


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Re: [Emc-users] [Emc-developers] using an absolute encoder

[andy pugh]

On 21 January 2016 at 22:45, Stuart Stevenson  wrote:
> Gentlemen,
> I desire to use an absolute encoder.
> I will work that direction if someone will point me to a good starting
> point.

What sort of absolute encoder? What do you want to do with it?

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[Emc-users] High Latency Before Updating 2.7

[Bruce Layne]

I hadn't seen this mentioned on the list, but maybe I missed it, or I 
read it and my old brain forgot.

I had a few old used PCs that I purchased for LinuxCNC 2.5.x.  I ran the 
latency test before buying them and the results were fairly good.  Then 
I decided to standardize on Atom motherboards for all of my little CNC 
projects.  I donated a PC to a friend, he installed LinuxCNC 2.7 from 
the latest LiveCD and had horrible latency issues.  I made a LinuxCNC 
house call and saw maximum jitter greater than 500,000 ns.  We did the 
updates to everything and the jitter dropped to around 12,000 ns, a 
little better than I originally saw with LinuxCNC 2.5.x.  His little 
C-Beam Machine desktop router is now humming along nicely (and noisily).

I'm a little interested in why the latency was so bad before updating, 
but mostly I posted this so people would know to run the updates before 
doing the latency test, and would realize that running the latency test 
from the live version running off a USB drive wouldn't be a proper test 
of whether a PC is a good candidate for LinuxCNC.




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Re: [Emc-users] [Emc-developers] using an absolute encoder

[andy pugh]

On 21 January 2016 at 23:23, Stuart Stevenson  wrote:

> I think a resolver would be the way to go.

Possibly not enough resolution for a rotary table.
Something like the Heidenhain angle encoders might be better, they
turn up on eBay occasionally.
http://bicep.caltech.edu/~yuki/servo/208_736-27.pdf

However the absolute ones appear to use EnDat, and I don't know if
there is any LinuxCNC support for that.

Renishaw have some that use SSI (Or BiSS, I have forgotten which, but
something there is a Mesa driver for).

If you could find a head for this...
http://www.ebay.co.uk/itm/Renishaw-RESR-20um-Rotary-Optical-Angle-Encoder-Ring-52mm-8192-Line-Count-/161850920680?hash=item25af110ee8:g:gtcAAOSwT5tWGQ8E


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Re: [Emc-users] [Emc-developers] using an absolute encoder

[Stuart Stevenson]

Hi Andy,
My definition of absolute encoder for this exercise is as follows:

Given a rotary table of infinite rotations I want the encoder to count to
359.( depending on resolution) and the next position to be 0.000.
The axis position of 90 degrees is always the same place.
The sign +/- tells the rotary table which direction to move to get the to
the commanded position -
ie: +90.00 and -90.00 are the exact same spot - one moved clockwise to get
there and the other moved counterclockwise to get there.

I think a resolver would be the way to go.

thanks
Stuart



On Thu, Jan 21, 2016 at 4:51 PM, andy pugh  wrote:

> On 21 January 2016 at 22:45, Stuart Stevenson  wrote:
> > Gentlemen,
> > I desire to use an absolute encoder.
> > I will work that direction if someone will point me to a good starting
> > point.
>
> What sort of absolute encoder? What do you want to do with it?
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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>



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Re: [Emc-users] mesa card choice and config

[andy pugh]

On 21 January 2016 at 22:26, claude  wrote:

> - This can be ethercat, as much as I know, there is no driver for
> linuxcnc. Also, hardware is quite expensive.

There is, but licensing problems mean that it can't be a part of LinuxCNC.
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?EtherCatDriver

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Re: [Emc-users] mesa card choice and config

[claude]

Well, to give my understanding,

To have a real time interface to physical world, there is the need to 
use some hardware. When you speak about hardware, you mean as well 
driver, and this start to be quite complicated.

- This can be ethercat, as much as I know, there is no driver for 
linuxcnc. Also, hardware is quite expensive.
- This can be canopen, I don't know of real time hardware (this exclude 
USB dongle), as well as linuxcnc seem to not support it (yet?)
- This can be pluto P FPGA board, I did use it on small application, 
work well, but not big and serious enough for this project.
- this can be some other of theses solutions: 
http://linuxcnc.org/docs/2.7/html/ (see under hardware driver), but 
honestly, most are old, not much maintened.
- As much as I know, Mesa is supported, and that the solution I want to 
use, to save time and energy.

I did have expectation to deliver some hardware interface solution for 
linuxcnc (I'm hardware electronic senior), but honestly, between the 
definition of the product, the conception, the driver and the continuous 
evolution of linux,  with all the differents uses people want of the 
product, it's an really hard target goal. Maybe one day...

Claude



On 21.01.2016 19:41, John Dammeyer wrote:
> I'm a little puzzled.
>
> Lately the discussion on servos and LinuxCNC appears to give the impression
> that the only solution is a PC and boards from Mesa.  Does that mean
> LinuxCNC has now become a defacto Mesa product?
>
> Either stepper motors and an older PC that supports parallel port or if you
> want servos that aren't driven with a Gecko Step/Dir input (much like a
> stepper motor) then it's a Mesa product or nothing?
>
> John Dammeyer
>
>
>
>
> --
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[Emc-users] using an absolute encoder

[Stuart Stevenson]

Gentlemen,
I desire to use an absolute encoder.
I will work that direction if someone will point me to a good starting
point.

having some fun now
Stuart

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Re: [Emc-users] mesa card choice and config

[Jon Elson]

On 01/21/2016 12:41 PM, John Dammeyer wrote:
> I'm a little puzzled.
>
> Lately the discussion on servos and LinuxCNC appears to give the impression
> that the only solution is a PC and boards from Mesa.  Does that mean
> LinuxCNC has now become a defacto Mesa product?
>
Well, I sure hope not!  Pico Systems was making analog 
servo, stepper and digital servo products starting in 2002 
for the original EMC program.  Our products are organized a 
little differently that Mesa's, we have a board for each 
basic system type rather than reprogramming the board for 
what type of I/O you want.

Mesa's scheme is to sell the FPGA board at a VERY low price, 
but then you need a number of add-ons.
We try to sell one unit that is as complete a controller as 
we can, at the best price we can still make a few dollars on.

While we are not coming out with a new product every month, 
we tried to make a complete controller, and then provide a 
stable product. When computers got faster, it caused some 
issues with the connectivity between the PC and the 
controller board, and we had to make changes to keep that 
working.  But, we've tried to make everything backward 
compatible.  I know (due to occasional repairs and 
questions) that some of the controller boards we sold as far 
back as 2004 are still in use.

Jon

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Re: [Emc-users] 4 ton project?

[Todd Zuercher]

I can't say for certain without knowing more about exactly what you have but 
Fanuc of that era should use ordinary encoders, fed directly to the control, 
the control then sends a synthetic analog tacho singnal and analog control 
signals back to the servo amps, which are fairly ordinary DC servo amps and 
motors.

- Original Message -
From: "lloyd wilson" 
To: "Emc mail list" 
Sent: Thursday, January 21, 2016 7:45:48 PM
Subject: [Emc-users] 4 ton project?

I just went to look at a '80s Bridgeport VMC with Heidenhain controller 
and Fanuc yellow cap servos (didn't get inside a cabinet for closer 
investigation - yet). The beast has a tool changer and a bad controller. 
Anyone have experience with that particular configuration? Particularly, 
what servo amps were used and what encoder technology - I remember 
discussions about Fanuc hardware that suggested that specialized 
interface hardware is necessary. What about tool changer technology - I 
assume a PLC process in the LCNC environment would be sufficient to get 
that running.

It's probably just a passing fancy, but oh my it's a temptation.

Thanks

-ldw

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[Emc-users] 4 ton project?

[lloyd wilson]

I just went to look at a '80s Bridgeport VMC with Heidenhain controller 
and Fanuc yellow cap servos (didn't get inside a cabinet for closer 
investigation - yet). The beast has a tool changer and a bad controller. 
Anyone have experience with that particular configuration? Particularly, 
what servo amps were used and what encoder technology - I remember 
discussions about Fanuc hardware that suggested that specialized 
interface hardware is necessary. What about tool changer technology - I 
assume a PLC process in the LCNC environment would be sufficient to get 
that running.

It's probably just a passing fancy, but oh my it's a temptation.

Thanks

-ldw

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Re: [Emc-users] [Emc-developers] using an absolute encoder

[Dave Cole]

Heidenhain also sells absolute encoders that output SSI.
I've used them before.   They are expensive.   As I recall $800-$900 for 
a rotary one.
If they are wired wrong they can easily be destroyed...  An electrician 
kept changing the wiring and destroyed two of them before I could 
intervene.
He would come in very early and must have been asleep while working!

Dave



On 1/21/2016 7:03 PM, andy pugh wrote:
> On 21 January 2016 at 23:23, Stuart Stevenson  wrote:
>
>> I think a resolver would be the way to go.
> Possibly not enough resolution for a rotary table.
> Something like the Heidenhain angle encoders might be better, they
> turn up on eBay occasionally.
> http://bicep.caltech.edu/~yuki/servo/208_736-27.pdf
>
> However the absolute ones appear to use EnDat, and I don't know if
> there is any LinuxCNC support for that.
>
> Renishaw have some that use SSI (Or BiSS, I have forgotten which, but
> something there is a Mesa driver for).
>
> If you could find a head for this...
> http://www.ebay.co.uk/itm/Renishaw-RESR-20um-Rotary-Optical-Angle-Encoder-Ring-52mm-8192-Line-Count-/161850920680?hash=item25af110ee8:g:gtcAAOSwT5tWGQ8E
>
>

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Re: [Emc-users] using an absolute encoder

[Ken Strauss]

I've used the AS5048B in a robotics application. Note that the magnet must
have a transverse magnetic orientation rather than the axial orientation of
most rare earth magnets.

> -Original Message-
> From: Mark Johnsen [mailto:m...@ijohnsen.com]
> Sent: Thursday, January 21, 2016 7:34 PM
> To: emc-users@lists.sourceforge.net
> Subject: [Emc-users] using an absolute encoder
>
> http://ams.com/eng/Products/Position-Sensors/Magnetic-Rotary-Position-
> Sensors/AS5040
>
> You can buy demo boards from digikey and I think they have versions up to
> 14bit (?).  12 bit for sure.  Also, they have ABI output (channel a,
channel b,
> and index) as well as pwm and ssi.  Hmm, ABI wouldn't work so well for
> absolute position, but the other outputs would.
>
> I think renishaw makes 'finished' versions of these.
>
> I ran across CUI, Inc on digikey and they have low cost capacitive
encoders.
> Think mititoyu caliper.
> http://www.cui.com/product/components/encoders/absolute/modular/amt2
> 0-v-kit
>
> This one is spi:
> http://www.digikey.com/product-search/en/sensors-
> transducers/encoders/1966131?k=AMT20
>
> Good luck.
> Mark
>
> From: andy pugh 
> > Subject: Re: [Emc-users] [Emc-developers] using an absolute encoder
> > To: "Enhanced Machine Controller (EMC)"
> > 
> > Message-ID:
> > <
> > CAN1+YZWVQ+O44DzmnWZhsfYdRG9+8o8reSHk-oKz7WSU1DBF-
> q...@mail.gmail.com>
> > Content-Type: text/plain; charset=UTF-8
> >
> > On 21 January 2016 at 23:23, Stuart Stevenson  wrote:
> >
> > > I think a resolver would be the way to go.
> >
> > Possibly not enough resolution for a rotary table.
> > Something like the Heidenhain angle encoders might be better, they
> > turn up on eBay occasionally.
> > http://bicep.caltech.edu/~yuki/servo/208_736-27.pdf
> >
> > However the absolute ones appear to use EnDat, and I don't know if
> > there is any LinuxCNC support for that.
> >
> > Renishaw have some that use SSI (Or BiSS, I have forgotten which, but
> > something there is a Mesa driver for).
> >
> > If you could find a head for this...
> >
> > http://www.ebay.co.uk/itm/Renishaw-RESR-20um-Rotary-Optical-Angle-
> Enco
> > der-Ring-52mm-8192-Line-Count-
> /161850920680?hash=item25af110ee8:g:gtcA
> > AOSwT5tWGQ8E
> >
> >
> > --
>

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[Emc-users] There needs to be a 'Cliff notes' / The idiots guide to Smart Serial configurations.

[Greg Bentzinger]

Hello fellow users;

Today I will ask for clarity in understanding Smart serial usage.

>From the many docs I have read so far it appears to rule out SSerial as a 
>single point to point only interface and that the devices are somehow linked 
>via hub or a daisy chain. Which is it?
I picked up a second hand 5i25/7i77 PNG kit that was unused, though today I 
would have opted for the 6i25. This kit will get things started, but down the 
line I will want to tap into the +/- 10V output on the servomate amps which 
reports the current loading level of each servo. Likewise the Spindle VFD also 
has the load output via +/- 10V. These can be wired to a 7i87, but I will also 
likely want a 7i73 for operator control. Will I have to get another host 
adaptor for the 2nd port on the 5i25 or . . . ?

Oh yeah - and what are these field current inputs on a 7i77... but that's a 
whole nother set of questions.

Greg

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Re: [Emc-users] High Latency Before Updating 2.7

[Gene Heskett]

On Thursday 21 January 2016 18:37:39 Bruce Layne wrote:

> I hadn't seen this mentioned on the list, but maybe I missed it, or I
> read it and my old brain forgot.
>
> I had a few old used PCs that I purchased for LinuxCNC 2.5.x.  I ran
> the latency test before buying them and the results were fairly good. 
> Then I decided to standardize on Atom motherboards for all of my
> little CNC projects.  I donated a PC to a friend, he installed
> LinuxCNC 2.7 from the latest LiveCD and had horrible latency issues. 
> I made a LinuxCNC house call and saw maximum jitter greater than
> 500,000 ns.  We did the updates to everything and the jitter dropped
> to around 12,000 ns, a little better than I originally saw with
> LinuxCNC 2.5.x.  His little C-Beam Machine desktop router is now
> humming along nicely (and noisily).
>
> I'm a little interested in why the latency was so bad before updating,
> but mostly I posted this so people would know to run the updates
> before doing the latency test, and would realize that running the
> latency test from the live version running off a USB drive wouldn't be
> a proper test of whether a PC is a good candidate for LinuxCNC.
>
This walks and quacks like the nvidia driver duck, which locks out 
interrupts for 100's of milliseconds at a time when its even remotely 
busy.  The card can probably be driven by the nouveau driver, which does 
not abuse the system to nearly that extent.  The fallback vesa driver 
could be the acid test if you can coax it into running that in place of 
the proprietary nvidia driver.  If the latency then is good, then see if 
you can make it switch to the nouveau driver.  Its not a gamers driver, 
but its plenty good enough to show you what linuxcnc is doing in real 
time.
>
>
>
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Cheers, Gene Heskett
-- 
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[Emc-users] using an absolute encoder

[Mark Johnsen]

http://ams.com/eng/Products/Position-Sensors/Magnetic-Rotary-Position-Sensors/AS5040

You can buy demo boards from digikey and I think they have versions up to
14bit (?).  12 bit for sure.  Also, they have ABI output (channel a,
channel b, and index) as well as pwm and ssi.  Hmm, ABI wouldn't work so
well for absolute position, but the other outputs would.

I think renishaw makes 'finished' versions of these.

I ran across CUI, Inc on digikey and they have low cost capacitive
encoders.  Think mititoyu caliper.
http://www.cui.com/product/components/encoders/absolute/modular/amt20-v-kit

This one is spi:
http://www.digikey.com/product-search/en/sensors-transducers/encoders/1966131?k=AMT20

Good luck.
Mark

From: andy pugh 
> Subject: Re: [Emc-users] [Emc-developers] using an absolute encoder
> To: "Enhanced Machine Controller (EMC)"
> 
> Message-ID:
> <
> can1+yzwvq+o44dzmnwzhsfydrg9+8o8reshk-okz7wsu1db...@mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On 21 January 2016 at 23:23, Stuart Stevenson  wrote:
>
> > I think a resolver would be the way to go.
>
> Possibly not enough resolution for a rotary table.
> Something like the Heidenhain angle encoders might be better, they
> turn up on eBay occasionally.
> http://bicep.caltech.edu/~yuki/servo/208_736-27.pdf
>
> However the absolute ones appear to use EnDat, and I don't know if
> there is any LinuxCNC support for that.
>
> Renishaw have some that use SSI (Or BiSS, I have forgotten which, but
> something there is a Mesa driver for).
>
> If you could find a head for this...
>
> http://www.ebay.co.uk/itm/Renishaw-RESR-20um-Rotary-Optical-Angle-Encoder-Ring-52mm-8192-Line-Count-/161850920680?hash=item25af110ee8:g:gtcAAOSwT5tWGQ8E
>
>
> --
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Re: [Emc-users] High Latency Before Updating 2.7

[Bruce Layne]

My friend speculated that maybe the updates that installed (over 60 MB 
worth of packages) included a different video driver that greatly 
decreased the latency problem and I commented that this seemed like a 
probable explanation based on my limited knowledge.  The difference was 
extreme - unusable before upgrading and working great after the upgrades.

BTW - If anyone is looking for a rigid little 12" X 12" desktop CNC 
router, the C-Beam Machine from OpenBuild looked very nice to me. It's 
fairly inexpensive, and it's a quick easy build.  It's also very modular 
so it'd be fairly easy to scale it up a bit.  I think it's just three of 
the standard OpenBuild axes, bolted orthogonally.  OpenBuild uses it to 
make their aluminum brackets for their OpenBuild kits, so it kind of 
makes itself.  The structure seemed rigid but the stepper motor sounds 
seemed to be resonating in the aluminum frame and the resonant 
frequencies were loud, but I doubt you'd notice if using the recommended 
Bosch Colt router as a spindle motor with small carbide bits to machine 
aluminum.



On 01/21/2016 07:56 PM, Gene Heskett wrote:
> This walks and quacks like the nvidia driver duck, which locks out
> interrupts for 100's of milliseconds at a time when its even remotely
> busy.  The card can probably be driven by the nouveau driver, which does
> not abuse the system to nearly that extent.  The fallback vesa driver
> could be the acid test if you can coax it into running that in place of
> the proprietary nvidia driver.  If the latency then is good, then see if
> you can make it switch to the nouveau driver.  Its not a gamers driver,
> but its plenty good enough to show you what linuxcnc is doing in real
> time.
>


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[Emc-users] C-Beam noise Re: High Latency Before Updating 2.7

[Gregg Eshelman]

On 1/21/2016 6:16 PM, Bruce Layne wrote:

> BTW - If anyone is looking for a rigid little 12" X 12" desktop CNC
> router, the C-Beam Machine from OpenBuild

> The structure seemed rigid but the stepper motor sounds
> seemed to be resonating in the aluminum frame and the resonant
> frequencies were loud, but I doubt you'd notice if using the recommended
> Bosch Colt router as a spindle motor with small carbide bits to machine
> aluminum.

Filling any interior voids in the extrusions with silicone should cure that.

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Re: [Emc-users] C-Beam noise Re: High Latency Before Updating 2.7

[Bruce Layne]

Once I convinced my friend that the noise wasn't the result of some 
problem with the stepper motors and seemed to be greatly amplified at 
resonant frequencies, we quickly brainstormed a couple of fixes 
involving various extrusion fills and RTV silicone was at the top of our 
list.  Great minds think alike, I guess.  :-)

My recent experiments with RTV silicone lead me to guess that the 
silicone would cure a couple of inches on the ends where it was exposed 
to the air, and the inner fill either wouldn't cure at all or would cure 
over the course of a year or so.  In this application, it probably 
wouldn't matter.  The dampening would be provided by cured or uncured 
silicone rubber.

Strange Coincidence - I was taking another look at the RTV silicone on 
the McMaster-Carr website (for my upcoming silicone rubber 3D printing 
project) when your email arrived in my Inbox.



On 01/22/2016 12:14 AM, Gregg Eshelman wrote:
>> >The structure seemed rigid but the stepper motor sounds
>> >seemed to be resonating in the aluminum frame and the resonant
>> >frequencies were loud, but I doubt you'd notice if using the recommended
>> >Bosch Colt router as a spindle motor with small carbide bits to machine
>> >aluminum.
> Filling any interior voids in the extrusions with silicone should cure that.


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Re: [Emc-users] mesa card choice and config

[John Dammeyer]

Thanks.  I realize the question was about specific Mesa choices but at one
point it was like "I have a servo, what Mesa card do I use?" Not stated was
whether there were any options.  Like "I have a servo, what's the best
servo/encoder controller out there?"
So I was curious.
John


> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-21-16 10:53 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] mesa card choice and config
> 
> 
> On 21 January 2016 at 18:41, John Dammeyer 
> wrote:
> 
> > Either stepper motors and an older PC that supports parallel port or if
you
> > want servos that aren't driven with a Gecko Step/Dir input (much like a
> > stepper motor) then it's a Mesa product or nothing?
> 
> Not at all.
> 
> The Pico solutions are well supported:
> http://www.pico-systems.com/motion.html
> 
> And there is a new(ish) product line from General Mechatronics:
> http://www.generalmechatronics.com/en/linuxcnc
> 
> And the Motenc:
> http://www.vitalsystem.com/web/motion/motionLite.php
> 
> And Servo-to-Go
> http://www.servotogo.com/index.shtml
> 
> Are still supported by LinuxCNC drivers.
> 
> However, the question asked was "What Mesa cards can I use" so I
> suggested Mesa cards.
> 
> There are actually rather more options than listed here:
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Hardware
> 
> 
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
>

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