[Emc-users] What ACCELERATION values can I expect from a Bridgeport Interact mill

2010-08-29 Thread Igor Chudov
I have been using the mill, today, for making a part where most of the
time was spent engraving small text. Due to low setting of
acceleration (which I picked out of abundance of caution),  the mill
could not reach the desired speed when engraving those letters.

So, for a big Bridgeport Interact mill, what kind of acceleration for
X and Y are possible?

i

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Re: [Emc-users] What ACCELERATION values can I expect from a BridgeportInteract mill

2010-08-29 Thread RogerN

I would recommend setting up Hal Scope to show the commanded position and 
the actual position (or perhaps following error or velocity error if there 
is a setting for that), then program some back and forth motion, increase 
acceleration until the following error grows at the point where direction is 
reversed.  Then back off acceleration until the machine no longer has 
difficulty following the command.  Simply put, accelerate as fast as the 
motor and drive are capable of, using Hal Scope to find that speed.  If you 
do that and it seems excessive, you can always lower it.

Roger Neal


- Original Message - 
From: Igor Chudov ichu...@gmail.com
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Sent: Sunday, August 29, 2010 1:34 AM
Subject: [Emc-users] What ACCELERATION values can I expect from a 
BridgeportInteract mill


I have been using the mill, today, for making a part where most of the
 time was spent engraving small text. Due to low setting of
 acceleration (which I picked out of abundance of caution),  the mill
 could not reach the desired speed when engraving those letters.

 So, for a big Bridgeport Interact mill, what kind of acceleration for
 X and Y are possible?

 i

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Re: [Emc-users] Enshu progress

2010-08-29 Thread Mark Wendt (Contractor)
Holy crap Stuart, you must have one hell of a wiring diagram for that 
machine!  Nicely done!

Mark

At 07:01 PM 8/28/2010, you wrote:
I will post some pictures of the entire machine :)

On Sat, Aug 28, 2010 at 5:54 PM, Igor Chudov ichu...@gmail.com wrote:

  I am lost, is that a machine or just a cabinet with electronics?
 
  he cabinet looks neat, however.
 
  On Sat, Aug 28, 2010 at 4:46 PM, Stuart Stevenson stus...@gmail.com
  wrote:
   Gentlemen,
Pictures of the Enshu. This should be the final configuration.
  
   http://www.mpm1.com:8080/machines/enshu/pictures/Gallery
  
   thank you EMC2 gentlemen
   Stuart
  
  
   On Fri, Aug 27, 2010 at 7:23 AM, Jim Coleman drunkenwhip...@gmail.com
  wrote:
  
   thats a nice clean lookin setup.  good job.  I plan on re-using as many
  of
   the honda connectors I have as I can.  did you buy new or re-use?  I've
  got
   a bunch of MR-25L, MR-30L and MR-50Ls from my mill and the one I
  scrapped
   for the employer.  looks like it should be pretty easy o clean up the
   solder
   tabs and reuse them.
  
   On Thu, Aug 26, 2010 at 10:05 PM, Stuart Stevenson stus...@gmail.com
   wrote:
  
the Enshu lives again
I moved the XYZ axes under EMC2 control this afternoon.
I should be able to work on the I/O config and tuning tomorrow.
I will post some more pictures.
   
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Re: [Emc-users] Enshu progress

2010-08-29 Thread Stuart Stevenson
Mark,
  I will put our final schematic in the enshu directory when we are happy
with what we have.
thanks
Stuart

On Sun, Aug 29, 2010 at 6:27 AM, Mark Wendt (Contractor) 
mark.we...@nrl.navy.mil wrote:

 Holy crap Stuart, you must have one hell of a wiring diagram for that
 machine!  Nicely done!

 Mark

 At 07:01 PM 8/28/2010, you wrote:
 I will post some pictures of the entire machine :)
 
 On Sat, Aug 28, 2010 at 5:54 PM, Igor Chudov ichu...@gmail.com wrote:
 
   I am lost, is that a machine or just a cabinet with electronics?
  
   he cabinet looks neat, however.
  
   On Sat, Aug 28, 2010 at 4:46 PM, Stuart Stevenson stus...@gmail.com
   wrote:
Gentlemen,
 Pictures of the Enshu. This should be the final configuration.
   
http://www.mpm1.com:8080/machines/enshu/pictures/Gallery
   
thank you EMC2 gentlemen
Stuart
   
   
On Fri, Aug 27, 2010 at 7:23 AM, Jim Coleman 
 drunkenwhip...@gmail.com
   wrote:
   
thats a nice clean lookin setup.  good job.  I plan on re-using as
 many
   of
the honda connectors I have as I can.  did you buy new or re-use?
  I've
   got
a bunch of MR-25L, MR-30L and MR-50Ls from my mill and the one I
   scrapped
for the employer.  looks like it should be pretty easy o clean up
 the
solder
tabs and reuse them.
   
On Thu, Aug 26, 2010 at 10:05 PM, Stuart Stevenson 
 stus...@gmail.com
wrote:
   
 the Enshu lives again
 I moved the XYZ axes under EMC2 control this afternoon.
 I should be able to work on the I/O config and tuning tomorrow.
 I will post some more pictures.

 --
 dos centavos


   
  
 
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Re: [Emc-users] Enshu progress

2010-08-29 Thread dave
Wow! What a clean conversion. Love that star ground. :-)

Dave

On Sun, 2010-08-29 at 09:04 -0500, Stuart Stevenson wrote:
 Mark,
   I will put our final schematic in the enshu directory when we are happy
 with what we have.
 thanks
 Stuart
 
 On Sun, Aug 29, 2010 at 6:27 AM, Mark Wendt (Contractor) 
 mark.we...@nrl.navy.mil wrote:
 
  Holy crap Stuart, you must have one hell of a wiring diagram for that
  machine!  Nicely done!
 
  Mark
 
  At 07:01 PM 8/28/2010, you wrote:
  I will post some pictures of the entire machine :)
  
  On Sat, Aug 28, 2010 at 5:54 PM, Igor Chudov ichu...@gmail.com wrote:
  
I am lost, is that a machine or just a cabinet with electronics?
   
he cabinet looks neat, however.
   
On Sat, Aug 28, 2010 at 4:46 PM, Stuart Stevenson stus...@gmail.com
wrote:
 Gentlemen,
  Pictures of the Enshu. This should be the final configuration.

 http://www.mpm1.com:8080/machines/enshu/pictures/Gallery

 thank you EMC2 gentlemen
 Stuart


 On Fri, Aug 27, 2010 at 7:23 AM, Jim Coleman 
  drunkenwhip...@gmail.com
wrote:

 thats a nice clean lookin setup.  good job.  I plan on re-using as
  many
of
 the honda connectors I have as I can.  did you buy new or re-use?
   I've
got
 a bunch of MR-25L, MR-30L and MR-50Ls from my mill and the one I
scrapped
 for the employer.  looks like it should be pretty easy o clean up
  the
 solder
 tabs and reuse them.

 On Thu, Aug 26, 2010 at 10:05 PM, Stuart Stevenson 
  stus...@gmail.com
 wrote:

  the Enshu lives again
  I moved the XYZ axes under EMC2 control this afternoon.
  I should be able to work on the I/O config and tuning tomorrow.
  I will post some more pictures.
 
  --
  dos centavos
 
 

   
  
  --
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users
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Re: [Emc-users] Enshu progress

2010-08-29 Thread Daniel Goller
Makes me even more curious what our Mori Seiki is going to be like when it's
done.

Very nice job.

On Aug 29, 2010 11:30 AM, dave dengv...@charter.net wrote:

Wow! What a clean conversion. Love that star ground. :-)

Dave


On Sun, 2010-08-29 at 09:04 -0500, Stuart Stevenson wrote:
 Mark,
 I will put our final schemat...
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[Emc-users] Monitor cable lengths

2010-08-29 Thread Daniel Goller
We plan on using 2 24 LCD monitors on our lathe.
1680x1050 is the resolution of some we have in house.

I was wondering if anyone can share their experience with DVI-D/DVI-I cable
lengths past the specification's 5m/16ft.

I think I trust some comments on here than more anonymous comments
elsewhere.

We replaced a crt in one lathe with a lcd, it shows some strange sync issues
the crt never had. And that's only lowres 15 vga. So it would be nice to
know what to expect with a higher resolution signal.

Also interesting how some sites also recommend vga over dvi-d/i for longer
cable runs.
My expectation was a digital signal can be run longer than an analog one.

Thanks,

Daniel
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[Emc-users] My waterjet machine, retrofitted to EMC (also - a sales ad)

2010-08-29 Thread Viesturs Lācis
Hello!

Following other members on this list, I also would like to share
information about my abrasive waterjet cutting machine that has been
converted to EMC2.

Originally it was produced in 2001 by PTV, working envelope is 3000 * 2000 mm.

Here are first 3 pictures I have taken:
http://www.cutting.lv/en/waterjet-pictures

(if anyone is curious to look around my webpage, then LV version
contains more pictures, showing different completed jobs, apologies
for my laziness, but all my clients are from LV)

What I have done:
1) first of all, a PCB was created that converts usual step/dir signal
to a step/dir signal in a twisted pair (servo drives accept only 24 V
step/dir signal or 5V step/dir signal in a twisted pair;
2) PCB with optoisolators was created to join existing limit and
homing switches with EMC. All the existing hardware is working with
24V signal level, which is not directly compatible with LPT port;
3) relays for control of water jet and abrasive have been added. Water
jet is a spindle for EMC and abrasive is coolant flood.
4) I installed EMC2 :);
5) I created new panel for control cabinet, where:
5.1) old 10 monitor is upgraded to 17,
5.2) I also have duplicated 2 buttons and 3 signal lights from the
pump - it has made my life much easier, as I do not have to run to
pump to switch it to high pressure and back to low pressure after
cutting is finished (it is not recommended to stay in high pressure
mode, when not cutting, as it puts a lot of stress to high pressure
tubing - water pressure is ~ 4000 bar)
   5.3) I have added 2 switches for manual control of waterjet and
abrasive together and abrasive only. It allows me to turn off jet and
abrasive manually, when running file as well as I can easily switch to
water only cutting, because g-code always contains both commands -
for water jet (M3 and M5 respectively) and for abrasive (M8 and M9
respectively). It can now be managed easily and effectively.
5.4) I cut, welded and painted the new sheet for a panel. It
twisted during welding, so there are few dents from hammer as I tried
to straighten it out :) Painting has not covered them completely.


5 axis cutting capability is still a work-in-progress due to different
difficulties with stepper motors and my Gecko drives. I still owe a
lot of thanks to Andy Pugh, who devoted a lot of time and effort to
the kinematics module that handles all the compensating moves, as well
as takes tilt angle from G-code (where it is included as a command for
A axis), then calculates tangent of the nozzle's movement - C axis and
then converts all that to actual commands for A and B axis. First
tests indicate that the module is working, but more tweaking is
necessary to make it more precise.


One of the reasons I am sharing all this information is that I would
like to sell this machine - my financial position is insufficient to
cover my bank payments.
If anyone is interested, please do not hesitate to contact me.

If there are any other things that You would like to see - servo
motors, pump or anything else, let me know and I will post the
pictures in my homepage. Unfortunately max available size for pictures
is 800 * 600 pixels.

Viesturs

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[Emc-users] Emc2 Safe Zone ?

2010-08-29 Thread Daniel Goller
We are wondering if emc2 can have a Safe Zone.

We would like to define where chuck and tail stock are and keep the machine
from smacking into those.
Like an extended soft limit.

Possible difficulties I see in this is that often we get the turret within
.050 of the tail stock quill.
Which means this safe zone would require a rather fine grained resolution in
Z, to avoid false alarms while still being able to stop the actual crash.

Is there something emc2 already has that could be used for this?

Thanks,

Daniel
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Re: [Emc-users] What ACCELERATION values can I expect from a Bridgeport Interact mill

2010-08-29 Thread Jon Elson
Igor Chudov wrote:
 I have been using the mill, today, for making a part where most of the
 time was spent engraving small text. Due to low setting of
 acceleration (which I picked out of abundance of caution),  the mill
 could not reach the desired speed when engraving those letters.

 So, for a big Bridgeport Interact mill, what kind of acceleration for
 X and Y are possible?
   
Depends on your servo amps, motors, etc.  You can actually measure it, 
using EMC.
What you can do is incrementally up the MAX_ACCELERATION values in the .ini
file, and have following error showing in HalScope.  As you raise the 
acceleration,
you may see error peaks during the acceleration/deceleration part of 
moves.  Adding a
little FF2 may help damp these down.  (Note it is real easy to overshoot 
with FF2 and
start making the error worse.)  When you can't increase acceleration any 
more without
serious spikes in the following error, you are probably maxing out your 
servo amps.
If the current limit on the amps is set as high as you think prudent, 
that is your limit.

I am using 3 in/sec^2 accleration on my Bridgeport, but I have puny 
servo amps and
motors.  If I increase it, it starts breaking timing belts, because they 
are only 3/8 wide
belts.  (This drive system came from a machine with a much lighter axis 
setup.)
I have no idea what values other people are using, but I'm sure you can 
go higher than 3.

Jon

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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Igor Chudov
I had good experience with appx. that long VGA cable.


On Sun, Aug 29, 2010 at 11:56 AM, Daniel Goller mor...@gmail.com wrote:
 We plan on using 2 24 LCD monitors on our lathe.
 1680x1050 is the resolution of some we have in house.

 I was wondering if anyone can share their experience with DVI-D/DVI-I cable
 lengths past the specification's 5m/16ft.

 I think I trust some comments on here than more anonymous comments
 elsewhere.

 We replaced a crt in one lathe with a lcd, it shows some strange sync issues
 the crt never had. And that's only lowres 15 vga. So it would be nice to
 know what to expect with a higher resolution signal.

 Also interesting how some sites also recommend vga over dvi-d/i for longer
 cable runs.
 My expectation was a digital signal can be run longer than an analog one.

 Thanks,

 Daniel
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Re: [Emc-users] What ACCELERATION values can I expect from a Bridgeport Interact mill

2010-08-29 Thread Igor Chudov
Jon, I messed around a bit until I saw max following error at about
0.0012. At that point I backed out a bit. I have acceleration set to
8 for X and 6 for Y and 15 for Z. This feels adequate.

i

On Sun, Aug 29, 2010 at 12:49 PM, Jon Elson el...@pico-systems.com wrote:
 Igor Chudov wrote:
 I have been using the mill, today, for making a part where most of the
 time was spent engraving small text. Due to low setting of
 acceleration (which I picked out of abundance of caution),  the mill
 could not reach the desired speed when engraving those letters.

 So, for a big Bridgeport Interact mill, what kind of acceleration for
 X and Y are possible?

 Depends on your servo amps, motors, etc.  You can actually measure it,
 using EMC.
 What you can do is incrementally up the MAX_ACCELERATION values in the .ini
 file, and have following error showing in HalScope.  As you raise the
 acceleration,
 you may see error peaks during the acceleration/deceleration part of
 moves.  Adding a
 little FF2 may help damp these down.  (Note it is real easy to overshoot
 with FF2 and
 start making the error worse.)  When you can't increase acceleration any
 more without
 serious spikes in the following error, you are probably maxing out your
 servo amps.
 If the current limit on the amps is set as high as you think prudent,
 that is your limit.

 I am using 3 in/sec^2 accleration on my Bridgeport, but I have puny
 servo amps and
 motors.  If I increase it, it starts breaking timing belts, because they
 are only 3/8 wide
 belts.  (This drive system came from a machine with a much lighter axis
 setup.)
 I have no idea what values other people are using, but I'm sure you can
 go higher than 3.

 Jon

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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Stuart Stevenson
The vga cable on the MDSI 5 axis Cinci is probably 25 feet long. We have had
zero problems with it. The computer is on the side of the machine and the
monitor is out front. The cable runs through the machine. The mouse and
keyboard and touch screen cables are all the same length and we have had no
problems with any cables.

On Sun, Aug 29, 2010 at 1:34 PM, Igor Chudov ichu...@gmail.com wrote:

 I had good experience with appx. that long VGA cable.


 On Sun, Aug 29, 2010 at 11:56 AM, Daniel Goller mor...@gmail.com wrote:
  We plan on using 2 24 LCD monitors on our lathe.
  1680x1050 is the resolution of some we have in house.
 
  I was wondering if anyone can share their experience with DVI-D/DVI-I
 cable
  lengths past the specification's 5m/16ft.
 
  I think I trust some comments on here than more anonymous comments
  elsewhere.
 
  We replaced a crt in one lathe with a lcd, it shows some strange sync
 issues
  the crt never had. And that's only lowres 15 vga. So it would be nice to
  know what to expect with a higher resolution signal.
 
  Also interesting how some sites also recommend vga over dvi-d/i for
 longer
  cable runs.
  My expectation was a digital signal can be run longer than an analog one.
 
  Thanks,
 
  Daniel
 
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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Igor Chudov
On Sun, Aug 29, 2010 at 1:42 PM, Stuart Stevenson stus...@gmail.com wrote:
 The vga cable on the MDSI 5 axis Cinci is probably 25 feet long. We have had
 zero problems with it. The computer is on the side of the machine and the
 monitor is out front. The cable runs through the machine. The mouse and
 keyboard and touch screen cables are all the same length and we have had no
 problems with any cables.

Exactly the same here, all cables run through the pendant arm now.

i


 On Sun, Aug 29, 2010 at 1:34 PM, Igor Chudov ichu...@gmail.com wrote:

 I had good experience with appx. that long VGA cable.


 On Sun, Aug 29, 2010 at 11:56 AM, Daniel Goller mor...@gmail.com wrote:
  We plan on using 2 24 LCD monitors on our lathe.
  1680x1050 is the resolution of some we have in house.
 
  I was wondering if anyone can share their experience with DVI-D/DVI-I
 cable
  lengths past the specification's 5m/16ft.
 
  I think I trust some comments on here than more anonymous comments
  elsewhere.
 
  We replaced a crt in one lathe with a lcd, it shows some strange sync
 issues
  the crt never had. And that's only lowres 15 vga. So it would be nice to
  know what to expect with a higher resolution signal.
 
  Also interesting how some sites also recommend vga over dvi-d/i for
 longer
  cable runs.
  My expectation was a digital signal can be run longer than an analog one.
 
  Thanks,
 
  Daniel
 
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[Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Colin Kingsbury
This is probably going to seem like a ridiculously obvious question, but
before I start buying and cutting too much material I wanted to double-check
my understanding of how the various parts of a complete system interact.

The project I'm working on is to build a really comprehensive physical
interface panel for my milling machine. Namely I want to have dedicated
buttons for lots of functions, some with LEDs to indicate current status.
For instance, I'd like a button that toggles flood coolant on and off, with
an LED that shows whether it's on or off, (in case I don't happen to notice
the lube spraying everywhere) I've gotten the basic HAL-Arduino example
from the Axis unpy.net site to work, and I've used the Arduino for other
things before, so I feel like I have at least one idea of where to start on
the hardware side.

Now, my question is what happens with the various GUIs like Axis if there is
something like my keypanel in the system. Does Axis (or TkEMC, etc.)
actively poll HAL every so often to see if the status of things (like flood
coolant) have changed? Ideally, I'd like to see the following sequence of
events occur:

1. Flood coolant is off. Both the control panel LED and the Axis UI show
flood coolant off.
2. I load and start a G-code program which uses flood. The LED turns on as
the flood G-code is executed.
3. I press the flood button on the keypanel which sends a signal to HAL to
toggle the flood coolant off.
4. HAL shuts off the flood coolant. The keypanel LED goes out and the Axis
UI shows flood coolant as off.

Essentially, I think my question boils down to whether I understand HAL
correctly as being the source of truth for both my physical keypanel as well
as for the GUI, or whether the GUI thinks it's the only thing affecting
machine state?
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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Rainer Schmidt
When the analog signal degrades it still maintains a high level of information 
compared to a degrading digital signal.
Compare that with a lithium Ion Battery driven tool and an older NiCad driven 
tool. 
The Nicad performance degrades slowly and in case of a drill you might manage 
to squeeze one or two of those last holes out of the tool. 
The digitally controlled Li battery will stop form one moment to the other. 

So, analog becomes gradually more 'fuzzy' and digital either works, or not in a 
rather catastrophic way. 

Having that said, the focus is clearly on signal quality. You can either switch 
to fiberglass transmission with encoders and decoders on either end, or better 
cables (makes a HUGE HUGE difference!), signal amplifiers, broad band cables 
with en and de coders. You can reach FAR but the distance comes with a price. 
10-20 ft should be doable with cables made for the signals intended.  And as 
expected... those will not come from China and cost money. 

Cheers
Rainer



On Aug 29, 2010, at 2:34 PM, Igor Chudov wrote:

 I had good experience with appx. that long VGA cable.
 
 
 On Sun, Aug 29, 2010 at 11:56 AM, Daniel Goller mor...@gmail.com wrote:
 We plan on using 2 24 LCD monitors on our lathe.
 1680x1050 is the resolution of some we have in house.
 
 I was wondering if anyone can share their experience with DVI-D/DVI-I cable
 lengths past the specification's 5m/16ft.
 
 I think I trust some comments on here than more anonymous comments
 elsewhere.
 
 We replaced a crt in one lathe with a lcd, it shows some strange sync issues
 the crt never had. And that's only lowres 15 vga. So it would be nice to
 know what to expect with a higher resolution signal.
 
 Also interesting how some sites also recommend vga over dvi-d/i for longer
 cable runs.
 My expectation was a digital signal can be run longer than an analog one.
 
 Thanks,
 
 Daniel
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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Daniel Goller
Wonder if this means vga actually does win over dvi in this use case.

For one I will make sure the monitors allow analog and digital input, just
in case.

On a desktop or laptop the answer is simple. Digital  analog.

At least vga cables are an inexpensive alternative to dvi boosters or fibre
dvi cables.

On Aug 29, 2010 1:46 PM, Stuart Stevenson stus...@gmail.com wrote:

The vga cable on the MDSI 5 axis Cinci is probably 25 feet long. We have had
zero problems with it. The computer is on the side of the machine and the
monitor is out front. The cable runs through the machine. The mouse and
keyboard and touch screen cables are all the same length and we have had no
problems with any cables.


On Sun, Aug 29, 2010 at 1:34 PM, Igor Chudov ichu...@gmail.com wrote:

 I had good experience wi...
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Re: [Emc-users] touchy no start machine

2010-08-29 Thread Chris Radek
On Sat, Aug 28, 2010 at 04:08:21PM -0500, Stuart Stevenson wrote:

 [19076.980342] io[19939]: segfault at 08a40880 eip 0804b222 esp bfa1bcc0
 error 6

This is now fixed in v2.4_branch and master.

Chris

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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Alex Joni


On 8/29/2010 9:49 PM, Colin Kingsbury wrote:
 snip
 Essentially, I think my question boils down to whether I understand HAL
 correctly as being the source of truth for both my physical keypanel as well
 as for the GUI, or whether the GUI thinks it's the only thing affecting
 machine state?

EMC2 was designed with the idea in mind that there are always more than 
one possible control sources. That means you can run multiple GUIs and 
each will update emc2 status (which is shown in all GUIs).
so if you push a button on the HALUI (HAL User Interface) the result 
will be visible on all the GUIs (including AXIS and HALUI itself).
That said you should remember that the multiple control means you don't 
want exclusive control items: potentiometers, on/off switches, selection 
switches, etc, but rather momentary control items.
Instead of a potentiometer for feedrate override use an encoder - that 
way when the GUI changes feedrate override the potentiometer doesn't 
show something that isn't accurate.
Likewise for on/off switches (if it's a momentary toggle button, then 
it's ok, but you need some extra HAL components: as it is now halui 
takes a button for coolant-on and coolant-off - both momentary 
pushbutton entries).

With pyvcp you can build a sample control and simulate everything you'll 
lateron physically wire at the machine, so that you can prove beforehand 
that it works as you expect it. There is a sample config where there's 
almost a complete GUI using pyVCP.

Regards,
Alex

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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Gene Heskett
On Sunday, August 29, 2010 04:57:33 pm Daniel Goller did opine:

 Wonder if this means vga actually does win over dvi in this use case.
 
That will, speaking as a broadcast engineer with a good working knowledge 
of cables and terminations, depend on the overall quality of the cable 
used, and the precision of the terminations used AT BOTH ENDS of the cable.

vga is an analog signal, and is best at almost any distance as long as the 
cable and terminating impedances are well matched..  And by matched, I mean 
if the cable is a 73 ohm cable (and most of the so-called video cables are) 
but it is terminated with the out of the box 75 ohm resistor, as a parallel 
load on the receiving end, and as a source from a video amplifier with a 
very low output impedance that is running at 2x the signal level, then its 
going to be quite decent for goodly run lengths, for good low loss cabling, 
2 or 3 hundred feet.

Digital, OTOH, is often thought of as a yes or no signal so the designers 
tend to play economy games with the terminations and cable qualities.
Digital errors you will often see as blinky pixels when right at the end of 
that cables length that it can maintain a picture at all.

Generally speaking, distance runs should be in vga, but that in turn limits 
the available max pixels, usually to less than the 1680x1050 that this 
monitor is natively capable of.

If a digital cable can't seem to make the run, then I expect it could be 
fixed with cabling that more nearly matches the termination schemes used, 
paying more attention to the terminating load at the monitor, than to the 
source impedance at the video card source.  If there isn't much echo from 
the monitor that could bounce back off a poor source termination, that would 
be the ideal target to shoot for.  And there will probably be stubborn 
cases where the monitors input circuitry just simply isn't correct for any 
available cabling, one might have to play in the monitors circuitry to see 
if it could be improved.  However, in terms of making it work in a 
reasonable time frame, the best choice might be to throw money at a 
different monitor brand name, with the understanding that its returnable the 
next day if it doesn't work.  The well designed one will Just Work(TM) on a 
surprising length of decent cabling.

 For one I will make sure the monitors allow analog and digital input,
 just in case.

I have so far, had great results from SamSung, even their hidef tvs, when 
driven by a computer, are quite stunning.  This 205bw is about 4 years old 
now and I had to replace that pair of filter capacitors on the power board 
about a year ago as the ccfl backlight was getting intermittent, but for me 
that is the cost of running it the 25 miles to the tv station  using their 
stock of those caps, which we use by the shoebox full.  One of the 'perks' 
of being the retired CE. ;-)

-- 
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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Daniel Goller
Do i understand you right that you expect VGA cables to be better
engineered compared to digital cables that tend to be more engineered
with a zeros and ones signal doesn't need all that great quality
cabling and we can make more profit with cheaper cables and noone will
notice in mind.

What would you vote for if the quality of the analog and digital
cables would be both of high quality, properly terminated?
(I know which i prefer on a short run from tower to lcd, which is what
made reading about all of this rather surprising.)

Thanks,

Daniel

On Sun, Aug 29, 2010 at 4:29 PM, Gene Heskett gene.hesk...@gmail.com wrote:
 On Sunday, August 29, 2010 04:57:33 pm Daniel Goller did opine:

 Wonder if this means vga actually does win over dvi in this use case.

 That will, speaking as a broadcast engineer with a good working knowledge
 of cables and terminations, depend on the overall quality of the cable
 used, and the precision of the terminations used AT BOTH ENDS of the cable.

 vga is an analog signal, and is best at almost any distance as long as the
 cable and terminating impedances are well matched..  And by matched, I mean
 if the cable is a 73 ohm cable (and most of the so-called video cables are)
 but it is terminated with the out of the box 75 ohm resistor, as a parallel
 load on the receiving end, and as a source from a video amplifier with a
 very low output impedance that is running at 2x the signal level, then its
 going to be quite decent for goodly run lengths, for good low loss cabling,
 2 or 3 hundred feet.

 Digital, OTOH, is often thought of as a yes or no signal so the designers
 tend to play economy games with the terminations and cable qualities.
 Digital errors you will often see as blinky pixels when right at the end of
 that cables length that it can maintain a picture at all.

 Generally speaking, distance runs should be in vga, but that in turn limits
 the available max pixels, usually to less than the 1680x1050 that this
 monitor is natively capable of.

 If a digital cable can't seem to make the run, then I expect it could be
 fixed with cabling that more nearly matches the termination schemes used,
 paying more attention to the terminating load at the monitor, than to the
 source impedance at the video card source.  If there isn't much echo from
 the monitor that could bounce back off a poor source termination, that would
 be the ideal target to shoot for.  And there will probably be stubborn
 cases where the monitors input circuitry just simply isn't correct for any
 available cabling, one might have to play in the monitors circuitry to see
 if it could be improved.  However, in terms of making it work in a
 reasonable time frame, the best choice might be to throw money at a
 different monitor brand name, with the understanding that its returnable the
 next day if it doesn't work.  The well designed one will Just Work(TM) on a
 surprising length of decent cabling.

 For one I will make sure the monitors allow analog and digital input,
 just in case.

 I have so far, had great results from SamSung, even their hidef tvs, when
 driven by a computer, are quite stunning.  This 205bw is about 4 years old
 now and I had to replace that pair of filter capacitors on the power board
 about a year ago as the ccfl backlight was getting intermittent, but for me
 that is the cost of running it the 25 miles to the tv station  using their
 stock of those caps, which we use by the shoebox full.  One of the 'perks'
 of being the retired CE. ;-)

 --
 Cheers, Gene
 There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order.
 -Ed Howdershelt (Author)
 What I need is a MATURE RELATIONSHIP with a FLOPPY DISK ...

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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Igor Chudov
Guys, would you recommend some inexpensive encoder type hand controls?
I would like to control speed override with a rugged encoder type
rotary control.

i

On Sun, Aug 29, 2010 at 2:40 PM, Alex Joni alex.j...@robcon.ro wrote:


 On 8/29/2010 9:49 PM, Colin Kingsbury wrote:
 snip
 Essentially, I think my question boils down to whether I understand HAL
 correctly as being the source of truth for both my physical keypanel as well
 as for the GUI, or whether the GUI thinks it's the only thing affecting
 machine state?

 EMC2 was designed with the idea in mind that there are always more than
 one possible control sources. That means you can run multiple GUIs and
 each will update emc2 status (which is shown in all GUIs).
 so if you push a button on the HALUI (HAL User Interface) the result
 will be visible on all the GUIs (including AXIS and HALUI itself).
 That said you should remember that the multiple control means you don't
 want exclusive control items: potentiometers, on/off switches, selection
 switches, etc, but rather momentary control items.
 Instead of a potentiometer for feedrate override use an encoder - that
 way when the GUI changes feedrate override the potentiometer doesn't
 show something that isn't accurate.
 Likewise for on/off switches (if it's a momentary toggle button, then
 it's ok, but you need some extra HAL components: as it is now halui
 takes a button for coolant-on and coolant-off - both momentary
 pushbutton entries).

 With pyvcp you can build a sample control and simulate everything you'll
 lateron physically wire at the machine, so that you can prove beforehand
 that it works as you expect it. There is a sample config where there's
 almost a complete GUI using pyVCP.

 Regards,
 Alex

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[Emc-users] Play/Pause and One Step buttons?

2010-08-29 Thread Igor Chudov
My mill has two buttons, one  is a green one and another is red.

The way I would like to use them is as Play and Pause. As follows:

* If a program is not running, or is suspended, green button starts it.
* If a program is running, green button has no effect.
* If a program is running, red button suspends it.
* If a program is not running, or is suspended, red button has no effect.

In other words, I want to use them as Play and Pause buttons, like on a VCR.

I also have another button that I want to use as do one G-code
instruction button. When pressed, one G code instruction will be
executed and then execution will stop.

Am I on the right track with this logic and if so, what sorts of Axis
elements should I use?

I am finally able to work on them because I removed a shipload of
unused wiring from the pendant arm and can deal with extra wiring
without the horrid mess of 100+ other wires that were in the arm. This
is because the old control was in the pendant, but the PC with EMC
will be in the main cabinet.

Also, for simplicity, for these extra signals, I wants to use a Cat6
cable, because of its compactness. There is no problems with those
wires twisted together, right? (I am using PPMC).

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Re: [Emc-users] Play/Pause and One Step buttons?

2010-08-29 Thread Steve Blackmore
On Sun, 29 Aug 2010 19:37:25 -0500, you wrote:

My mill has two buttons, one  is a green one and another is red.

The way I would like to use them is as Play and Pause. As follows:

* If a program is not running, or is suspended, green button starts it.
* If a program is running, green button has no effect.
* If a program is running, red button suspends it.
* If a program is not running, or is suspended, red button has no effect.

You're missing a stop button.

Steve Blackmore
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Re: [Emc-users] Play/Pause and One Step buttons?

2010-08-29 Thread Igor Chudov
Well, I have two choices regarding Stop behavior.

1) I can do stop from GUI.
2) I can say that if I press the red button when the program is
suspended, it stops execution altogether as a stop button.

My preferred choice for now is 1).

i

On Sun, Aug 29, 2010 at 7:49 PM, Steve Blackmore st...@pilotltd.net wrote:
 On Sun, 29 Aug 2010 19:37:25 -0500, you wrote:

My mill has two buttons, one  is a green one and another is red.

The way I would like to use them is as Play and Pause. As follows:

* If a program is not running, or is suspended, green button starts it.
* If a program is running, green button has no effect.
* If a program is running, red button suspends it.
* If a program is not running, or is suspended, red button has no effect.

 You're missing a stop button.

 Steve Blackmore
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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Jack Coats
I had an issue with this back in the dot-bomb days when setting up a
data center.  We got a KVM extender, that allowed us to have a 'direct
connected' ethernet cable a couple of hundred feet long or so, and it
passed VGA quality signal along with keyboard and mouse (they had some
with sound too) over the 8 wire twisted pair ethernet cable.  It was
not ethernet, and did not go through ANY ethernet switch gear.

Not cheap, but worked for our situation. ... I just purchased it at a
local electronic supply store, not Fry's but a similar more local
store in the Houston TX area.

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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Gene Heskett
On Sunday, August 29, 2010 11:23:04 pm Daniel Goller did opine:

 Do i understand you right that you expect VGA cables to be better
 engineered compared to digital cables that tend to be more engineered
 with a zeros and ones signal doesn't need all that great quality
 cabling and we can make more profit with cheaper cables and noone will
 notice in mind.

That is about the size of it.  For short runs in digital, say 4 feet or so, 
you can get away with cabling murder because the cable is shorter than the 
time of one pixel.  Longer runs will often cause breakups because the echos 
are sufficiently time displaced to be thought of as a status change for the 
next pixel when it really isn't.  That will cause the pixel to the right of 
the edge of an object to flicker or some such error.

 What would you vote for if the quality of the analog and digital
 cables would be both of high quality, properly terminated?

Digital.  Then it is usually up to the monitor to match the requested color 
to a very fine match.  That said, my lashup has an extension cable so the 
run is about 6 feet, and the analog and digital modes seem very close to 
identical, on this monitor.  I have not been able to see the difference if 
there is any.

 (I know which i prefer on a short run from tower to lcd, which is what
 made reading about all of this rather surprising.)
 
 Thanks,
 
 Daniel

[...]

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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Gene Heskett
On Sunday, August 29, 2010 11:38:12 pm Igor Chudov did opine:

 Guys, would you recommend some inexpensive encoder type hand controls?
 I would like to control speed override with a rugged encoder type
 rotary control.
 
A thought that I have played with in my mind, and gone as far as to order a 
few parts, is to use a more or less std small stepper motor with 12 or 24 
volt rated coils, as an encoder by feeding it to a pair of comparators 
which should give a quadrature A  B output.  I haven't worked out a 100%  
reliable method of protecting the comparator inputs from the over-voltage a 
fast spin of the knob on the motor shaft would feed them, nor have I worked 
out the most reliable hysteresis feedback to prevent low level vibrations 
and such from outputting spurious signals.  But, based on the fact that the 
average $3 stepper motor is also a heck of a good generator, I see no 
reason why it couldn't be done.

Suitable stepper motors can be had for small change.  I have a box that I 
was going to use that would hold one encoder/motor for each of the 4 axis's 
I have, a bit big, but with one knob per axis I think it would be more 
usable than a game pad that I have hooked up now.  A 5th motor could be 
installed for feed rate control, and a 6th for spindle speed is not a huge 
problem a long as I could get some help with the hal stuff.  But my box 
would be pretty crowded by the time I shoehorned 6 of the motors I have 
right now into it.

So its an idea I'm tossing out because I could do all 6 of those for less 
than a single pendant with one dial at the current prices.

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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] What ACCELERATION values can I expect from a Bridgeport Interact mill

2010-08-29 Thread Jon Elson
Igor Chudov wrote:
 Jon, I messed around a bit until I saw max following error at about
 0.0012. At that point I backed out a bit. I have acceleration set to
 8 for X and 6 for Y and 15 for Z. This feels adequate.
   
Yes, without really strong servos, like the SEM motors that Bridgeport 
uses in the
EZ-Trak and such machines, those numbers sound reasonable.  So, how does 
that
perform on your engraving programs?

Jon

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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Igor Chudov
On Sun, Aug 29, 2010 at 10:57 PM, Gene Heskett gene.hesk...@gmail.com wrote:
 On Sunday, August 29, 2010 11:38:12 pm Igor Chudov did opine:

 Guys, would you recommend some inexpensive encoder type hand controls?
 I would like to control speed override with a rugged encoder type
 rotary control.

 A thought that I have played with in my mind, and gone as far as to order a
 few parts, is to use a more or less std small stepper motor with 12 or 24
 volt rated coils, as an encoder by feeding it to a pair of comparators

Gene, I have a feeling that what I need, can be bought for $20-50 at
Digikey as a complete package. (hand controlled encoder) Am I
mistaken?

i

 which should give a quadrature A  B output.  I haven't worked out a 100%
 reliable method of protecting the comparator inputs from the over-voltage a
 fast spin of the knob on the motor shaft would feed them, nor have I worked
 out the most reliable hysteresis feedback to prevent low level vibrations
 and such from outputting spurious signals.  But, based on the fact that the
 average $3 stepper motor is also a heck of a good generator, I see no
 reason why it couldn't be done.

 Suitable stepper motors can be had for small change.  I have a box that I
 was going to use that would hold one encoder/motor for each of the 4 axis's
 I have, a bit big, but with one knob per axis I think it would be more
 usable than a game pad that I have hooked up now.  A 5th motor could be
 installed for feed rate control, and a 6th for spindle speed is not a huge
 problem a long as I could get some help with the hal stuff.  But my box
 would be pretty crowded by the time I shoehorned 6 of the motors I have
 right now into it.

 So its an idea I'm tossing out because I could do all 6 of those for less
 than a single pendant with one dial at the current prices.

 --
 Cheers, Gene
 There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order.
 -Ed Howdershelt (Author)
 You will be divorced within a year.

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Re: [Emc-users] What ACCELERATION values can I expect from a Bridgeport Interact mill

2010-08-29 Thread Igor Chudov
Jon, I do have those strong SEM servos. 30 amp peak, 145v. I take it
as a hint that my machine is capable of more.

I am afraid that I may have set DIP switches on some of my axis drives
to limit current too much. I will revisit it. It did make engraving
faster, perhaps 2x faster or so.

i


On Sun, Aug 29, 2010 at 11:53 PM, Jon Elson el...@pico-systems.com wrote:
 Igor Chudov wrote:
 Jon, I messed around a bit until I saw max following error at about
 0.0012. At that point I backed out a bit. I have acceleration set to
 8 for X and 6 for Y and 15 for Z. This feels adequate.

 Yes, without really strong servos, like the SEM motors that Bridgeport
 uses in the
 EZ-Trak and such machines, those numbers sound reasonable.  So, how does
 that
 perform on your engraving programs?

 Jon

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Re: [Emc-users] Monitor cable lengths

2010-08-29 Thread Igor Chudov
On Sun, Aug 29, 2010 at 11:51 PM, Jon Elson el...@pico-systems.com wrote:
 Igor Chudov wrote:
 I had good experience with appx. that long VGA cable.

 I've had terrible luck with even expensive VGA extension cables, and
 opened one
 up.  It was just a whole bunch of wires in one overall foil shield!  So,
 I have been
 making my own VGA cables for a while, with 5 lengths of RG-178 coax (75
 Ohm).


Well, I have no problem whatsoever, other than some excessive length
of that cable cluttering my control cabinet.

i

 Jon (who always does things the hard way)

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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Jon Elson
Igor Chudov wrote:
 Guys, would you recommend some inexpensive encoder type hand controls?
 I would like to control speed override with a rugged encoder type
 rotary control.
   
I needed to make another pendant, and looked on eBay for a while, but 
didn't find much
except a guy selling HEDSS handwheel encoders from China for $56 
delivered in the US.
So, I got one of those, and it has worked out well.

If you don't need the detents, then much cheaper encoders are available, 
like Agilent (formerly HP)
HEDS encoders, probably available surplus for ~ $10.

Jon

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Re: [Emc-users] Do I understand the EMC/HAL/UI architecture properly?

2010-08-29 Thread Igor Chudov
On Mon, Aug 30, 2010 at 12:00 AM, Jon Elson el...@pico-systems.com wrote:
 Igor Chudov wrote:
 Guys, would you recommend some inexpensive encoder type hand controls?
 I would like to control speed override with a rugged encoder type
 rotary control.

 I needed to make another pendant, and looked on eBay for a while, but
 didn't find much
 except a guy selling HEDSS handwheel encoders from China for $56
 delivered in the US.
 So, I got one of those, and it has worked out well.

 If you don't need the detents, then much cheaper encoders are available,
 like Agilent (formerly HP)
 HEDS encoders, probably available surplus for ~ $10.

Jon, do you have some examples of this that I can look at online, thanks a lot

Igor

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