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--- In mach1mach2cnc@..., "pavel59" <pavel@k...> wrote:

I'm sorry to repost, but maybe my previous message was not clearly
understandable.

My question is pretty simple:
I need to test MACH2 on closed loop.

<snip>
Others may jump in with more experience. This did come up before in
a slightly different form (on Master 5 group) The link:


from Marris at Geckodrives should get you into the "meat" of that
thread - actually closing a loop with servos.

I think that you will find doing it yourself is fraught with
difficulties not least with control instability caused by backlash
in the mechanics of the drive. Go to the servo drives if you need
the performance.

Best wishes

John Prentice

I'm sorry to repost, but maybe my previous message was not clearly
understandable.

My question is pretty simple:
I need to test MACH2 on closed loop.

I would like to try using encoders+steppers+MACH2

I know I need some HW in order to read the encoders and to control
the feedback on motors, I should have something from Kulaga or
similar, somewhere.

What's not clear to me is how will I interface an external board to
Mach and to the motors in order to correct eventual errors being read
by the encoders.

I would like to hear from someone who alredy used or is using such a
system.

I already decided to move to servos, but for some reasons I would
also test the steppers way.

Thanks in advance for your kind help

Paolo

--- In mach1mach2cnc@..., "John Guenther"
<j.guenther@v...> wrote:
<snip>
Now for a request: Is there any

way to be able to specify font size and perhaps font type? I was

able to

easily resize the screens to fit my display but the font on many

of the

buttons is larger than the button now. Any help will be

appreciated.

John Guenther

John

Thanks for your comments

The strict answer to your question is that 'Tweak cannot deal with
font size/face. The simplicity of Screen Designer is that Screen
Designer and Mach2 itself choose, at run time, a font whose height
will fit in a given DRO, Label etc. This makes visual creation of
screens very simple by dragging the handles to get a fit - no need
to choose sizes etc.

The caption for a Button is, however, always the same size font.
This makes it easy to make neat screens when the buttons may want to
be different heights but does mean that one cannot easily shrink
screens.

I guess Art's comment in message 476 tells us he is "on the case"

Best wishes, John Prentice

Dan,
Don't worry about asking questions, that's why they are called
questions.
I,ve been banned three times from CCED and I couldn't give a flying
f**k
It still doesn't stop Bill from emailing for advise on OT subjects
which I could refuse to give but that's petty.

To get back to spindle motors.
Some of the bigger machining centres use servo drive motors for the
main reason to know where the spindle rotation is in relation to the
Z move for tapping etc. This is achieved by using the spindle encoder
to keep track of the position.
Many just use a normal AC motor powered by an invertor or VFD,
depending on what you choose to call these.
The reason for this is to get the variable speed via the program
putting out, usually, a 0 - 10 volt analog signal to the invertor.

Arts program can do this but it's still in it's infancy.
Do a search under either Steve Blackmore name or PWM drive to find
some info on this.

John S.

--- In mach1mach2cnc@..., "deruida" <deruida@y...> wrote:

Dear Mr. Hicks, you are not alone in feeling a little unwelcome.
I'm sure there are many more out there. Heck even I hesitate to

ask

questions sometimes because I don't want to ask a question that has
been asked before. What I can say is that these groups are here

for

one important reason ...to ask questions and get them answered. If
you can't tell by now, Art is quite forgiving when it comes to the
types of questions that some feel are off topic. As I remember it,
Art said something to the effect that "Nobody is going to be
banned"! With exception of Art's first ban on the smut posting
jerk. I also will take this time to give thanks to Mr. Campbell

who

so graciously extended his help to you. THAT'S WHAT THIS GROUP IS
ALL ABOUT FOLKS! Sure many of the members of this group have far
more years working in the cnc field than most of us, but that's why
we need everyone's input and questions. I most likely will be
asking more questions from now on because I now am jobless thanks

to

a heartless boss that made me choose between going out of town for

a

multi-day trip or being there for the birth of my over due child.
So here is my latest question: I have searched the archives for
posts on using a servo motor for spindle control, but have not
really found one that tells you what you need to do. Can anyone
assist me on this one? A good friend and fellow engineer and I

want

to produce a medium sized cast iron 3 axis milling machine that

will

be rigid enough for steel and fill the gap between the knee mills
and the cnc machining centers. We want to produce it with a machine
controlled variable speed spindle, but need a little advise on the
pros and cons of different methods. THANK YOU IN ADVANCE FOR
HELPING OUT A RELATIVE NEWBE. Dan DeRuiter.

--- In mach1mach2cnc@..., Art <fenerty@a...> wrote:

Todd:

My fault. The 40 series of macro's was not set to "do not

overwrite", but

the .xml's were, so they SHOULDN'T overwrite. This meets up with

-Snip
Hi-
Sounds like were gaining on it! The xml's overwrite on my win 2k
and xp machines. These are on the same lan, could it be a setting of
mine?
Todd

Todd:

My fault. The 40 series of macro's was not set to "do not overwrite", but
the .xml's were, so they SHOULDN'T overwrite. This meets up with murphy's
law somewhere though.
Thanks,
Art
www.artofcnc.ca

Todd:

Yes, backup your xml file before installing. I will look again at my
installers ettings, but I'm sure I set it to "do not overwrite", but this
seems to fail on some systems. I will see if I can find the error.

Thanks,
Art
www.artofcnc.ca

--- In mach1mach2cnc@..., Art <fenerty@a...> wrote:

Todd:

It would really help if you can find out what macro causes this

trouble and

snip

Hi-
I am thinking this happened because mach2 overwrote 1/2 of my
macros, I am using #40-45, when mach2 installed it overwrote #40
through 42or43. These are the #'s that have a predefined macro, I
added 44&45. When mach2 installs or upgrades to rc11 it overwrites
my macros, my xml, my lay out, everything except for things I have
added, like my registration file and the macros With numbers that are
not the same as preinstalled ones. I have reinstalled rc11 8 or 10
times and every time it overwrites. There used to be a way to save
your settings to a file, is this the xml backup now? I'm using win2k.
Todd

On Wed, 20 Aug 2003 22:03:42 -0300, you wrote:

Steve:

I think its more related to the multithreading of the script engine which
was just turned on. Can't quite see what yet, but as Todd said, when he
copied in the old macro's, the parsing error went away. As to XML, I like it
better mnyself, certainly makes troubleshooting easier. There is undoubtably
some things that need cleaning up somewhere, but I can honestly tell you
that I have no real errors reported of the xml forgetting anything the way
the registry did.

No - right on brother!!

Now if I could just get that Lathe offset down.... ;)

Will have to wait for tomorrow for further reports - well past
machining curfew here ;)

You could always run it though - you have the lathe, file and tool
offsets<G>.

--
Steve Blackmore

Steve:

I think its more related to the multithreading of the script engine which
was just turned on. Can't quite see what yet, but as Todd said, when he
copied in the old macro's, the parsing error went away. As to XML, I like it
better mnyself, certainly makes troubleshooting easier. There is undoubtably
some things that need cleaning up somewhere, but I can honestly tell you
that I have no real errors reported of the xml forgetting anything the way
the registry did.
Now if I could just get that Lathe offset down.... ;)

Art
www.artofcnc.ca

On Wed, 20 Aug 2003 23:05:47 -0000, you wrote:

Hi Art,
I tried loading rc11 over rc10 on my win2k machine and the program
overwrote my macros and my xml file. I backed the entire mach2 dir,
so I tried to restore my xml and macros. things looked o.k. until I
loaded a file with macros in it. The program put up 5 or six error
messages, something about a scriptparse error and others. Is this a
problem you are aware of, or would you like more info. which files
should I try to restore into my mach2 dir?

Hi Todd - glad you posted this, I'm getting to think there's only me
having these problems! Joke - of course it's not just me, either
people aren't posting their bugs, or emailing Art direct ( hence the
odd offline emails I send get bounced due to "exceeded quota")

I've seen the parse error several times, I think it's due to
additional parameters being added to the XML file, that didn't exist
in previous versions. I like the XML "ini" file - it's far more
reliable than registry entries but I think it needs a bit more work on
its implementation. As it stands - it gets overwritten, destroying all
your settings, if you copy the old version you get parse errors on
"new" features that have settings in the XML file!!

One for you Art <G>.
--
Steve Blackmore

Thanks Todd:

I'll remove the fix and give you a hook to the button in a macro.

Thanks for the tests..
Art
www.artofcnc.ca

Todd:

It would really help if you can find out what macro causes this trouble and
send it to me so I can correct it. Steve has a problem where he gets an init
error as well, only he gets it once per session. I get the feeling some old
macro has a fault in it and won't run. If I can find out what , I will
correct it.

Thanks,
Art
www.artofcnc.ca

--- In mach1mach2cnc@..., Art <fenerty@a...> wrote:

No worries, I do not intend to require any change in code, I was

just

confused, because the unit was not rationalizing the DRO's when you

went to
-snip
Hi Art-
Things seem worse with the thc offsets. Even with the thc off if I
do a g28.1z.1 it runs but it displays a number in the z dro, not
zero. Same thing hapens with the ref-z window. If there is a way in
g code or macro to do a oem124 or whatever the number is for zeroing
the thc we wouldn't need this fix. Thanks
Todd

--- In mach1mach2cnc@..., "morgtod" <todmorg@h...> wrote:

Hi Art,

I copied my xml and the 5 macros that I use and it seems to work.
If I copy the macro directory it crashes.
Todd

I have a question, I would like to try using my current stepper
motors in a closed loop on Mach 2.
I know there's no way to have Mach2 doing the job on itself.
Did anybody here experienced a stepper closed loop with mach ?
Which hardware is requested ?
Could you suggest a solution or at least a link to some schematics?

I already know I will move to servos (very soon), but I would give a
try to see how the system would perform in a closed loop with stepper
motors.

Thanks

Paolo

Hi Art,
I tried loading rc11 over rc10 on my win2k machine and the program
overwrote my macros and my xml file. I backed the entire mach2 dir,
so I tried to restore my xml and macros. things looked o.k. until I
loaded a file with macros in it. The program put up 5 or six error
messages, something about a scriptparse error and others. Is this a
problem you are aware of, or would you like more info. which files
should I try to restore into my mach2 dir?
Thanks
Todd

John,

Kul Tool, that really makes things easier. Now for a request: Is there any
way to be able to specify font size and perhaps font type? I was able to
easily resize the screens to fit my display but the font on many of the
buttons is larger than the button now. Any help will be appreciated. This
is one neat tool to add to the Mach2 set.

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia

Hi All:

Due to popular demand I have added multi-pass to the next version. If you
have a fileset to cut 6mm deep, you can set it to do the first pass at a set
depth and repeat x number of times with a depth increment on each pass until
the final depth is reached. You can also set and turn on/off the ZInhibit
now on the corrections tab.

Thanks,
Art
www.artofcnc.ca

--- In mach1mach2cnc@..., "csgchum" <csg@c...> wrote:

just built it and gantry weighs 135# takes from 10 oz to just
over 16 oz. force to move it I have a choice of 180 oz
steppers or 600 oz servos both drives would be reduced 3.5-1
and one revolution = 2.25 inches

Is the stepper(180x3.5=630oz.) strong enough and fast enough

and is the servo to problematic for plasma??

-snip
Hi,
Use the servo's, with plasma cutting you need to maintain a fairly
high speed, even in corners and curves. the 135# gantry will have
lots of stored energy when you try to stop or reverse. On my system
the gantry is about 150# and I use 600 oz servos. The plasma has
never caused any problems, but the long encoder lines had to have
amps added ( us digital $12.00 ea ). Mach2 offers torch height
control ( using Tom Caudles control board ), tool path windows,
configurable windows, great speed, macro controls, just about
everything I could imagine you would ever need for plasma.
Todd