Re: [Emc-users] OT: US member doing injection molding?

[Sven Wesley]

Hawaii.
But that doesn't really matter, I'm interested in a US-branded product.



2014-11-20 5:19 GMT+01:00 jrmitchellj . :

> Where are you located?
>
> Ray
>
>
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Re: [Emc-users] OT: US member doing injection molding?

[Tux Lab]

Sven,

Too bad, I am ocean hop away in LA.   Do you have a BOM for your router build?

Are you building the injection molder from scratch or retrofitting an
existing one?

thanks,
John


On Wed, Nov 19, 2014 at 7:24 PM, Sven Wesley  wrote:
> I'm located in the far far West. Hawaii.
>
> @John:
> I have a 50 ton injection molder and I started making a new one but smaller
> that I was going to control with an Arduino.
> The CNC machines are one bug steel frame router table and a retrofitted
> operation center. Both are servo driven.
> I would love to help but I guess you are on mainland.
>
> @Ron:
> Thanks for the tip, will look into that.
>
> /S
>
>
> 2014-11-20 2:53 GMT+01:00 Tux Lab :
>
>> Hi Sven,
>>
>> Where are you located? What kind of milling machine were you
>> controlling with LinuxCNC?   I am sort of meandering my way toward
>> setting up a domestic manufacturing cooperative and am contemplating
>> building a LinuxCNC control milling machine.We are also sort of
>> working our way toward getting a small 25 ton injection molding
>> machine up and running.
>>
>> If you are near by, is building a LinuxCNC control mill something you
>> are interested in?
>>
>> thanks,
>> John
>> tux-lab.com
>>
>>
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Re: [Emc-users] OT: US member doing injection molding?

[a k]

search --- thomas register  on google.
than search plastic injection molding in thomas register.
it will bring up
Plastics: Injection Molded

(2,705
suppliers)
Tooling: Plastic Injection Molding

(272
suppliers)



On Thu, Nov 20, 2014 at 12:16 AM, Sven Wesley  wrote:

> Hawaii.
> But that doesn't really matter, I'm interested in a US-branded product.
>
>
>
> 2014-11-20 5:19 GMT+01:00 jrmitchellj . :
>
> > Where are you located?
> >
> > Ray
> >
> >
>
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Re: [Emc-users] OT: US member doing injection molding?

[Sven Wesley]

Ha ha, we went OT on the OT. :)

The new build is from scratch. Electro driven knee press mechanics, 30-35
ton clamping force but not a very large shot size. Really small floor area
is used, the machine is vertical.
My "real" machine can be tilted vertical but that is not to make a smaller
foot pring, a vertical machine is perfect when there are pieces that should
be molded into the plastic, like threads or reinforcements.

2014-11-20 9:46 GMT+01:00 Tux Lab :

> Sven,
>
> Too bad, I am ocean hop away in LA.   Do you have a BOM for your router
> build?
>
> Are you building the injection molder from scratch or retrofitting an
> existing one?
>
> thanks,
> John
>
>
> On Wed, Nov 19, 2014 at 7:24 PM, Sven Wesley 
> wrote:
> > I'm located in the far far West. Hawaii.
> >
> > @John:
> > I have a 50 ton injection molder and I started making a new one but
> smaller
> > that I was going to control with an Arduino.
> > The CNC machines are one bug steel frame router table and a retrofitted
> > operation center. Both are servo driven.
> > I would love to help but I guess you are on mainland.
> >
> > @Ron:
> > Thanks for the tip, will look into that.
> >
> > /S
> >
> >
> > 2014-11-20 2:53 GMT+01:00 Tux Lab :
> >
> >> Hi Sven,
> >>
> >> Where are you located? What kind of milling machine were you
> >> controlling with LinuxCNC?   I am sort of meandering my way toward
> >> setting up a domestic manufacturing cooperative and am contemplating
> >> building a LinuxCNC control milling machine.We are also sort of
> >> working our way toward getting a small 25 ton injection molding
> >> machine up and running.
> >>
> >> If you are near by, is building a LinuxCNC control mill something you
> >> are interested in?
> >>
> >> thanks,
> >> John
> >> tux-lab.com
> >>
> >>
> >
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Re: [Emc-users] Running Mitsubishi Meldas DC servo motors with LinuxCNC

[robert - Innovative-RC]

HI there

going from memory here but you need two volages to the drvie so need a 
power supply thats all, as control does that right now from its power supply

then feed the tachos back into the drive, on the M0 they went into the 
control card, then back out that was all, so was a case of moving the wires.

then anlogo in yes +10 to -10v
here is forum link
http://www.linuxcnc.org/linuxcnc/index.php/russian/forum/30-cnc-machines/559-emc-gets-fitted-to-a-leadwell-cnc-vmc

sorry should of said the title etc

you can always find me on IRC under the name, rob_h
31A im sure i have a manual ill look at work today migth be lucky and 
have it in PDF also, some used to be on Mitsubishi website

rob

On 20/11/2014 02:16, Leonardo Marsaglia wrote:
> 2014-11-19 21:44 GMT-03:00 robert - Innovative-RC 
> :
>
>> hi
>> looks the same servos as on the M0 which is a machine i retrofitted, its
>> a Mill but the same deal check the linuxcnc forum i put alot of info
>> on the drives on there when we did our retrofit with the old DC servo
>> drives...
>>
>>
>> if you need to know anything else let me know ill try and help the best
>> i can...
>>
>> what is the melda control model? or more so what are the servo drive
>> numbers i might have a manual of sorts
>>
>> rob
>>
> Hello Rob and thanks for your interest in helping me!
>
> I was trying to find your posts on the forum but there are so many that I
> can't. Can you point me to the post if you remember the name of it? or may
> be your user name on the forum?.
>
> The control of the machine is a Mazatrol T1. The servo motors are
> Mitsubishi, and the drives are Meldas. The servo drives model numbers are
> TRA-31A and TRA-41A.
>
> The main concern for me is how to set up the connection to run the drives
> with LinuxCNC. From what I could read, it seems that if I let everything as
> it is, and run the drives with the ready signals and the analog voltage for
> the velocity they should turn. The tachos will be telling to the drives the
> actual speed and I would only have to close the loop on LinuxCNC using the
> resolvers. I guess it's not more difficult than that. But I would love to
> hear suggestions!
>
>
>


-- 
---
Innovative-RC
Website: www.innovative-rc.co.uk
E-mail: sa...@innovative-rc.co.uk
Ebay Shop: www.stores.ebay.co.uk/innovative-rc



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Re: [Emc-users] Running Mitsubishi Meldas DC servo motors with LinuxCNC

[andy pugh]

On 20 November 2014 02:16, Leonardo Marsaglia
 wrote:
> The main concern for me is how to set up the connection to run the drives
> with LinuxCNC. From what I could read, it seems that if I let everything as
> it is, and run the drives with the ready signals and the analog voltage for
> the velocity they should turn. The tachos will be telling to the drives the
> actual speed and I would only have to close the loop on LinuxCNC using the
> resolvers. I guess it's not more difficult than that.

Indeed, once you find where the analogue voltage has to go and which
wire is which on the resolvers it should all be relatively simple.

With apologies to jon@pico-systems (who has a system that would work
well) I think this sounds like a  perfect fit for the Mesa 5i24 and
7i49 combination. Depending on how much GPIO you need you would
probably also want one or two 7i37TA boards too. (or if you need more
GPIO than that, possibly 7i44 + N * smart-serial GPIO boards)

I don't see any mention of Resolver interfaces on the General
Mechatronics site.

-- 
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Re: [Emc-users] Screw Mapping

[Mark Wendt]

On Tue, Nov 18, 2014 at 9:12 AM, andy pugh  wrote:

> On 18 November 2014 14:04, Mark Wendt  wrote:
> > It varies up and down the entire 55" of length of the Z axis, with small
> > islands that vary from the median by the same amount, and with several
> > points along the axis at the median table height.
>
> Plot it as a graph (spreadsheet or paper) and see how many
> straight-lines you need for a reasonable fit, then use the end points
> of the lines.
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>

Okay, yesterday afternoon I plotted out the bed in a spread sheet and
posted it to Google Docs:
https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD3Od7SsPfnqxXBg/edit#gid=740055151

Whatcha think?  Easy enough to do?

Mark
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Re: [Emc-users] Screw Mapping

[Dave Caroline]

I did notice this is on a wooden bench, I had a twisted lathe once
upon a time in the 1970s, I went to a local machine reconditioning
company and one of the first questions from the old guy was is it on
wood, he then said its going to move are you sure you want to do
thisI realised what he was saying and went back to the machine and
tested flex under load even when bolted to the bench.

3 thou can be regarded as good on a wood bench

Dave Caroline

On 20/11/2014, Mark Wendt  wrote:
> On Tue, Nov 18, 2014 at 9:12 AM, andy pugh  wrote:
>
>> On 18 November 2014 14:04, Mark Wendt  wrote:
>> > It varies up and down the entire 55" of length of the Z axis, with
>> > small
>> > islands that vary from the median by the same amount, and with several
>> > points along the axis at the median table height.
>>
>> Plot it as a graph (spreadsheet or paper) and see how many
>> straight-lines you need for a reasonable fit, then use the end points
>> of the lines.
>>
>> --
>> atp
>> If you can't fix it, you don't own it.
>> http://www.ifixit.com/Manifesto
>>
>
> Okay, yesterday afternoon I plotted out the bed in a spread sheet and
> posted it to Google Docs:
> https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD3Od7SsPfnqxXBg/edit#gid=740055151
>
> Whatcha think?  Easy enough to do?
>
> Mark
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Re: [Emc-users] Screw Mapping

[Mark Wendt]

On Thu, Nov 20, 2014 at 6:20 AM, Dave Caroline 
wrote:

> I did notice this is on a wooden bench, I had a twisted lathe once
> upon a time in the 1970s, I went to a local machine reconditioning
> company and one of the first questions from the old guy was is it on
> wood, he then said its going to move are you sure you want to do
> thisI realised what he was saying and went back to the machine and
> tested flex under load even when bolted to the bench.
>
> 3 thou can be regarded as good on a wood bench
>
> Dave Caroline
>


Dave,

The machine has been leveled with a machinist level, and there are
adjustable feet on the bottom of the machine.  I've taken numerous readings
on the machine's table, and the variation due to temperature of the table's
flatness is usually only a thou.  It's pretty stable.

Mark
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Re: [Emc-users] Screw Mapping

[andy pugh]

> https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD3Od7SsPfnqxXBg/edit#gid=740055151
>
> Whatcha think?  Easy enough to do?

Looks like you should get a nice fit with 14 points.


-- 
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http://www.ifixit.com/Manifesto

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Re: [Emc-users] i guess i need a new motherboard for new linuxcnc

[kqt4at5v]

On Wed, 19 Nov 2014, Peter C. Wallace wrote:

> On Wed, 19 Nov 2014, kqt4a...@gmail.com wrote:
>
>> Date: Wed, 19 Nov 2014 13:52:36 -0600 (CST)
>> From: kqt4a...@gmail.com
>> Reply-To: "Enhanced Machine Controller (EMC)"
>> 
>> To: emc-users@lists.sourceforge.net
>> Subject: [Emc-users] i guess i need a new motherboard for new linuxcnc
>>
>> Can you all recommend a basic motherboard that is know to work with
>> LinuxCNC running a parallel controller? Thanks.
>>
>> Richard
>
> The J1800,J1900,J2900 based motherboards work well with the latest Wheezy ISO
> (these are fanless, relatively fast (2x Atom) and low latency)
>


Is this what you are talking about, is 2 GB of memory enough

http://www.newegg.com/Product/Product.aspx?Item=N82E16813132104&cm_re=j1800-_-13-132-104-_-Product


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Re: [Emc-users] Screw Mapping

[Mark Wendt]

On Thu, Nov 20, 2014 at 6:38 AM, andy pugh  wrote:

> >
> https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD3Od7SsPfnqxXBg/edit#gid=740055151
> >
> > Whatcha think?  Easy enough to do?
>
> Looks like you should get a nice fit with 14 points.
>
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>


Andy,

How would you fit it into 14 points?  I seem to come up with quite a few
more points than 14.

Mark
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Re: [Emc-users] Screw Mapping

[andy pugh]

On 20 November 2014 11:47, Mark Wendt  wrote:

> How would you fit it into 14 points?  I seem to come up with quite a few
> more points than 14.

Using 16 I get
http://ibin.co/1htLwap6mz37

(Google sheets can't do XY plots properly)

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Re: [Emc-users] Screw Mapping

[Mark Wendt]

On Thu, Nov 20, 2014 at 7:54 AM, andy pugh  wrote:

> On 20 November 2014 11:47, Mark Wendt  wrote:
>
> > How would you fit it into 14 points?  I seem to come up with quite a few
> > more points than 14.
>
> Using 16 I get
> http://ibin.co/1htLwap6mz37
>
> (Google sheets can't do XY plots properly)
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>


Ah ha!  Thanks for that.  Appreciate the help Andy!

Mark
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Re: [Emc-users] Screw Mapping

[andy pugh]

On 20 November 2014 13:07, Mark Wendt  wrote:

>> Using 16 I get
>> http://ibin.co/1htLwap6mz37

> Ah ha!  Thanks for that.  Appreciate the help Andy!

Actually, you can do better than that. Because Lincurve doesn't
extrapolate you can drop the (0,0) point and add a (7,0) point to make
the fit better.

-- 
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Re: [Emc-users] Screw Mapping

[Mark Wendt]

On Thu, Nov 20, 2014 at 8:25 AM, andy pugh  wrote:

> On 20 November 2014 13:07, Mark Wendt  wrote:
>
> >> Using 16 I get
> >> http://ibin.co/1htLwap6mz37
>
> > Ah ha!  Thanks for that.  Appreciate the help Andy!
>
> Actually, you can do better than that. Because Lincurve doesn't
> extrapolate you can drop the (0,0) point and add a (7,0) point to make
> the fit better.
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>


Thanks!  I'll take a look at that too.

Mark
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Re: [Emc-users] Motor Resolvers

[Marius Liebenberg]

On 2014-11-18 20:28, andy pugh wrote:
> On 18 November 2014 17:33, Kirk Wallace  wrote:
>> The more I think about it, adding Halls seems to be the way to go.
> Resolvers are _really_ good transducers. It seems a shame not to use them.
>
> I have no boards left. But I can pass on the files to have a batch of
> PCBs made ($10 for 10 boards at seeedstudio.com )
>
> The results were disappointing for position feedback, but sending 3
> emulated Hall signals from Arduino GPIO and nothing else ought to work
> pretty well. Each Arduino does 3 motors.
Andy why were you disappointed with the position feedback.
Will it be ok on a slow moving bed?
Do you think a more powerful MCU will do the trick?


-- 

Regards /Groete

Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
QQ 1767394877


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Re: [Emc-users] Screw Mapping

[Gene Heskett]

On Thursday 20 November 2014 06:47:41 Mark Wendt did opine
And Gene did reply:
> On Thu, Nov 20, 2014 at 6:38 AM, andy pugh  wrote:
> > https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD
> > 3Od7SsPfnqxXBg/edit#gid=740055151
> > 
> > > Whatcha think?  Easy enough to do?
> > 
> > Looks like you should get a nice fit with 14 points.
> > 
> > 
> > --
> > atp
> > If you can't fix it, you don't own it.
> > http://www.ifixit.com/Manifesto
> 
> Andy,
> 
> How would you fit it into 14 points?  I seem to come up with quite a
> few more points than 14.
> 
> Mark

Pick your most + point, and your most - point, plus the start point and 
end points, and apply that correction to those 4 points only using 
lincurve & offset.  

Measure it again.  How much error is there now? And where?

Pick the next pair of maximum errors, and where you are inserting between 
previous points, slide the higher points one x#y# pigeon hole up to make 
room for the in-between point.  Pretty soon you'll be trying to compensate 
for the room temp variations, and I doubt you would need more than 10 of 
the 16 settings the default build of the module provides.

Actually, if I was doing it, I think I'd start at zero, move up the rails 
until you hit the first thousandth error.  Set lincurves x1 and y1.  
Measure to the next place you find a thou error, set x2y2 to fix that.

Repeat till you are at the other end of the rails.  and I doubt you would 
need more than 10 of the correction points you have.  And in any stretch 
of the rails where you seem to be fixing a straight line where the xN and 
xn+2 passes thru the point between them, the one in the middle can be 
deleted by putting the x4y4 values into the x3y3 box. 
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Cheers, Gene Heskett
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Re: [Emc-users] i guess i need a new motherboard for new linuxcnc

[Peter C. Wallace]

On Thu, 20 Nov 2014, kqt4a...@gmail.com wrote:

> Date: Thu, 20 Nov 2014 05:39:17 -0600 (CST)
> From: kqt4a...@gmail.com
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] i guess i need a new motherboard for new linuxcnc
> 
> On Wed, 19 Nov 2014, Peter C. Wallace wrote:
>
>> On Wed, 19 Nov 2014, kqt4a...@gmail.com wrote:
>>
>>> Date: Wed, 19 Nov 2014 13:52:36 -0600 (CST)
>>> From: kqt4a...@gmail.com
>>> Reply-To: "Enhanced Machine Controller (EMC)"
>>> 
>>> To: emc-users@lists.sourceforge.net
>>> Subject: [Emc-users] i guess i need a new motherboard for new linuxcnc
>>>
>>> Can you all recommend a basic motherboard that is know to work with
>>> LinuxCNC running a parallel controller? Thanks.
>>>
>>> Richard
>>
>> The J1800,J1900,J2900 based motherboards work well with the latest Wheezy ISO
>> (these are fanless, relatively fast (2x Atom) and low latency)
>>
>
>
> Is this what you are talking about, is 2 GB of memory enough
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16813132104&cm_re=j1800-_-13-132-104-_-Product
>

Thats one of the many J1800,J1900,J2900 motherboards that have displaced the 
older D525 and D2550,D2800 based motherboards in the low power X86 range

2G is fine for linuxcnc

This AMD MB is also OK

http://www.newegg.com/Product/Product.aspx?Item=N82E16813138412&cm_re=biostar_a4-5000-_-13-138-412-_-Product


Not sure how its latency compares (it has a LPT header, no back panel LPT 
port)

>
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Peter Wallace
Mesa Electronics

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(")_(") signature to help him gain world domination.


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Re: [Emc-users] i guess i need a new motherboard for new linuxcnc

[andy pugh]

On 20 November 2014 16:37, Peter C. Wallace  wrote:

> Thats one of the many J1800,J1900,J2900 motherboards that have displaced the
> older D525 and D2550,D2800 based motherboards in the low power X86 range

I wonder if this one would be any good? It looks like single 12V
power, which is a big plus.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157495

I think I see a parallel port header.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Latest Linux Build

[Marius Liebenberg]

Rick
I just looked at the 7i80 and it looks like the holes are symmetrical so 
you could mount it any way round I think.

On 2014-11-19 14:02, Rick Lair wrote:
> I would rather use the din rail mounts, but they are orientated 90
> degrees off of how I mount the boards, or so it looks like on the mesa
> web page.
>
>
> Thanks
>
>
> Rick
>
>
>
>
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>

-- 

Regards /Groete

Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
QQ 1767394877


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Re: [Emc-users] i guess i need a new motherboard for new linuxcnc

[Peter C. Wallace]

On Thu, 20 Nov 2014, andy pugh wrote:

> Date: Thu, 20 Nov 2014 16:50:23 +
> From: andy pugh 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] i guess i need a new motherboard for new linuxcnc
> 
> On 20 November 2014 16:37, Peter C. Wallace  wrote:
>
>> Thats one of the many J1800,J1900,J2900 motherboards that have displaced the
>> older D525 and D2550,D2800 based motherboards in the low power X86 range
>
> I wonder if this one would be any good? It looks like single 12V
> power, which is a big plus.
> http://www.newegg.com/Product/Product.aspx?Item=N82E16813157495
>
> I think I see a parallel port header.
>
> -- 
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>


Yep, if you zoom in you can see a 26 pin header labeled "LPT1"


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Peter Wallace
Mesa Electronics

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(")_(") signature to help him gain world domination.


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Re: [Emc-users] Motor Resolvers

[andy pugh]

On 20 November 2014 14:29, Marius Liebenberg  wrote:
> Andy why were you disappointed with the position feedback.
> Will it be ok on a slow moving bed?
> Do you think a more powerful MCU will do the trick?

It was noisy and dithered a lot. The Arduino has to measure 2 voltages
per measurement. To do it fast enough it had to be only 8 bits and the
shortest sample time that the Arduino could handle. Even then the
carrier was only 1kHz, whereas Resolvers normally work at at least
5kHz.

So, two noisy values divided by each other = a very noisy result,
which gives a noisy arctan and a lot of servo dither.

Yes, a more powerful MCU would be better, and it so happens that Mesa
and Pico sell exactly that all ready to go.

Why will nobody believe me when I say that my experiment was rubbish?

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Latest Linux Build

[Rick Lair]

The 7I80, and 7I49 are symmetrical, they are both 4" x 4", but the 7I70 
and 7I71 are not, and those are the more critical ones to have 
orientated this way. 48 number 16 MTW wires routed to each of these 
boards would look like crap with the board 90 degrees off.


Thanks


Rick



-- Original Message --
From: emc-users-requ...@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Sent: 11/20/2014 12:25:30 PM
Subject: Emc-users Digest, Vol 103, Issue 56

>Send Emc-users mailing list submissions to
>  emc-users@lists.sourceforge.net
>
>To subscribe or unsubscribe via the World Wide Web, visit
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>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Emc-users digest..."
>
>
>Today's Topics:
>
>1. Re: Screw Mapping (Mark Wendt)
>2. Re: Motor Resolvers (Marius Liebenberg)
>3. Re: Screw Mapping (Gene Heskett)
>4. Re: i guess i need a new motherboard for new linuxcnc
>   (Peter C. Wallace)
>5. Re: i guess i need a new motherboard for new linuxcnc (andy pugh)
>6. Re: Latest Linux Build (Marius Liebenberg)
>7. Re: i guess i need a new motherboard for new linuxcnc
>   (Peter C. Wallace)
>8. Re: Motor Resolvers (andy pugh)
>
>
>--
>
>Message: 1
>Date: Thu, 20 Nov 2014 08:41:59 -0500
>From: Mark Wendt 
>Subject: Re: [Emc-users] Screw Mapping
>To: "Enhanced Machine Controller (EMC)"
>  
>Message-ID:
>  
>Content-Type: text/plain; charset=UTF-8
>
>On Thu, Nov 20, 2014 at 8:25 AM, andy pugh  wrote:
>
>>  On 20 November 2014 13:07, Mark Wendt  wrote:
>>
>>  >> Using 16 I get
>>  >> http://ibin.co/1htLwap6mz37
>>
>>  > Ah ha! Thanks for that. Appreciate the help Andy!
>>
>>  Actually, you can do better than that. Because Lincurve doesn't
>>  extrapolate you can drop the (0,0) point and add a (7,0) point to 
>>make
>>  the fit better.
>>
>>  --
>>  atp
>>  If you can't fix it, you don't own it.
>>  http://www.ifixit.com/Manifesto
>>
>
>
>Thanks! I'll take a look at that too.
>
>Mark
>
>
>--
>
>Message: 2
>Date: Thu, 20 Nov 2014 16:29:51 +0200
>From: Marius Liebenberg 
>Subject: Re: [Emc-users] Motor Resolvers
>To: emc-users@lists.sourceforge.net
>Message-ID: <546dfadf.7040...@mastercut.co.za>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>On 2014-11-18 20:28, andy pugh wrote:
>>  On 18 November 2014 17:33, Kirk Wallace  
>>wrote:
>>>  The more I think about it, adding Halls seems to be the way to go.
>>  Resolvers are _really_ good transducers. It seems a shame not to use 
>>them.
>>
>>  I have no boards left. But I can pass on the files to have a batch of
>>  PCBs made ($10 for 10 boards at seeedstudio.com )
>>
>>  The results were disappointing for position feedback, but sending 3
>>  emulated Hall signals from Arduino GPIO and nothing else ought to 
>>work
>>  pretty well. Each Arduino does 3 motors.
>Andy why were you disappointed with the position feedback.
>Will it be ok on a slow moving bed?
>Do you think a more powerful MCU will do the trick?
>
>
>--
>
>Regards /Groete
>
>Marius D. Liebenberg
>+27 82 698 3251
>+27 12 743 6064
>QQ 1767394877
>
>
>
>
>--
>
>Message: 3
>Date: Thu, 20 Nov 2014 11:33:45 -0500
>From: Gene Heskett 
>Subject: Re: [Emc-users] Screw Mapping
>To: emc-users@lists.sourceforge.net
>Message-ID: <201411201133.45148.ghesk...@wdtv.com>
>Content-Type: Text/Plain; charset="windows-1256"
>
>On Thursday 20 November 2014 06:47:41 Mark Wendt did opine
>And Gene did reply:
>>  On Thu, Nov 20, 2014 at 6:38 AM, andy pugh  
>>wrote:
>>  > 
>>https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD
>>  > 3Od7SsPfnqxXBg/edit#gid=740055151
>>  >
>>  > > Whatcha think? Easy enough to do?
>>  >
>>  > Looks like you should get a nice fit with 14 points.
>>  >
>>  >
>>  > --
>>  > atp
>>  > If you can't fix it, you don't own it.
>>  > http://www.ifixit.com/Manifesto
>>
>>  Andy,
>>
>>  How would you fit it into 14 points? I seem to come up with quite a
>>  few more points than 14.
>>
>>  Mark
>
>Pick your most + point, and your most - point, plus the start point and
>end points, and apply that correction to those 4 points only using
>lincurve & offset.
>
>Measure it again. How much error is there now? And where?
>
>Pick the next pair of maximum errors, and where you are inserting 
>between
>previous points, slide the higher points one x#y# pigeon hole up to 
>make
>room for the in-between point. Pretty soon you'll be trying to 
>compensate
>for the room temp variations, and I doubt you would need more than 10 
>of
>the 16 settings the default build of the module provides.
>
>Actually, if I was doing it, I think I'd start at ze

Re: [Emc-users] Motor Resolvers

[Marius Liebenberg]

On 2014-11-20 19:25, andy pugh wrote:
> On 20 November 2014 14:29, Marius Liebenberg  wrote:
>> Andy why were you disappointed with the position feedback.
>> Will it be ok on a slow moving bed?
>> Do you think a more powerful MCU will do the trick?
> It was noisy and dithered a lot. The Arduino has to measure 2 voltages
> per measurement. To do it fast enough it had to be only 8 bits and the
> shortest sample time that the Arduino could handle. Even then the
> carrier was only 1kHz, whereas Resolvers normally work at at least
> 5kHz.
>
> So, two noisy values divided by each other = a very noisy result,
> which gives a noisy arctan and a lot of servo dither.
>
> Yes, a more powerful MCU would be better, and it so happens that Mesa
> and Pico sell exactly that all ready to go.
>
> Why will nobody believe me when I say that my experiment was rubbish?
Nobody will believe that of an esteemed gentlemen like you. I only need 
one channel so the mcu route seems ok but I might replace the resolver 
with an encoder and a reference location switch.

-- 

Regards /Groete

Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
QQ 1767394877


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Re: [Emc-users] Motor Resolvers

[Kirk Wallace]

On 11/20/2014 09:25 AM, andy pugh wrote:
... snip
> Yes, a more powerful MCU would be better, and it so happens that Mesa
> and Pico sell exactly that all ready to go.
>
> Why will nobody believe me when I say that my experiment was rubbish?
>

Because Arduinos are so cute.

I seem to recall, to get fast PWM, I had to use Timer1 and not use the 
Arduino PWM library. I wonder if the resolver decoder might be improved 
in a similar fashion? I haven't had the time to study Andy's code, but 
it may already be optimized.

There are many new AVRs (and ARMs) that have plenty of higher resolution 
timers. Maybe there are too many options.

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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Re: [Emc-users] Motor Resolvers

[andy pugh]

On 20 November 2014 17:56, Kirk Wallace  wrote:
> I seem to recall, to get fast PWM, I had to use Timer1 and not use the
> Arduino PWM library. I wonder if the resolver decoder might be improved
> in a similar fashion? I haven't had the time to study Andy's code, but
> it may already be optimized.

It is all driven by interrupts and direct register writes, it doesn't
use any Arduino libraries at all, not for PWM generation, not for
analogue reading and not even for computing the arctan.
(it uses an integer-only algorithm and a lookup table)

http://wiki.linuxcnc.org/uploads/Resolver.pde


-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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[Emc-users] Problem getting latest LinuxCNC RT-preempt version from Buildbot

[John Prentice (FS)]

I am trying to get a built copy of the rt preempt system from Master/(aka
2.8  pre?) via the buildbot as described at

 

http://buildbot.linuxcnc.org/

 

I have sources.list.d file setup including the line

 

"deb http://buildbot.linuxcnc.org/ wheezy master-rtpreempt"

 

The package manager returns the error:

 

"Failed to fetch http://buildbot.linuxcnc.org/dists/wheezy/Release  Unable
to find expected entry 'master-preempt/source/Sources' in Release file
(Wrong sources.list entry or malformed file)

Some index files failed to download. They have been ignored, or old ones
used instead."

 

Indeed the list in ../Release has an entry
'master-rtpreempt/sources/Sources' but not the one indicated in the error.

 

Is this a problem in my setup or inconsistency within the buildbot's data?

 

John Prentice

 

 

 

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Re: [Emc-users] Problem getting latest LinuxCNC RT-preempt version from Buildbot

[Sebastian Kuzminsky]

On 11/20/2014 12:21 PM, John Prentice (FS) wrote:
> I am trying to get a built copy of the rt preempt system from Master/(aka
> 2.8  pre?) via the buildbot as described at
> 
> http://buildbot.linuxcnc.org/

Hmm, it works for me here.

I can run "apt-get update", "apt-get install linuxcnc-uspace" (it gets
version 1:2.8.0~pre1.82.g6f96b26), and "apt-get source linuxcnc-uspace"
(gets same version).


> I have sources.list.d file setup including the line
> 
> "deb http://buildbot.linuxcnc.org/ wheezy master-rtpreempt"

My /etc/apt/source.list.d/linuxcnc-buildbot.list file has this:

deb http://buildbot.linuxcnc.org wheezy master-rtpreempt
deb-src http://buildbot.linuxcnc.org wheezy master-rtpreempt

The lines must have no quotes, I'm not sure if those are included in
your file or just in your email.

I tried it both with and without the deb-src line, and in both cases i
can update and install linuxcnc-uspace.


> The package manager returns the error:
> 
> "Failed to fetch http://buildbot.linuxcnc.org/dists/wheezy/Release  Unable
> to find expected entry 'master-preempt/source/Sources' in Release file
> (Wrong sources.list entry or malformed file)
> 
> Some index files failed to download. They have been ignored, or old ones
> used instead."

The file is there on the server.


> Indeed the list in ../Release has an entry
> 'master-rtpreempt/sources/Sources' but not the one indicated in the error.

That's not what i see.  I just looked in all the Release files and they
all correctly reference source/Sources.


-- 
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Re: [Emc-users] Running Mitsubishi Meldas DC servo motors with LinuxCNC

[Leonardo Marsaglia]

2014-11-20 7:22 GMT-03:00 robert - Innovative-RC :

> HI there
>
> going from memory here but you need two volages to the drvie so need a
> power supply thats all, as control does that right now from its power
> supply
>
> then feed the tachos back into the drive, on the M0 they went into the
> control card, then back out that was all, so was a case of moving the
> wires.
>
> then anlogo in yes +10 to -10v
> here is forum link
>
> http://www.linuxcnc.org/linuxcnc/index.php/russian/forum/30-cnc-machines/559-emc-gets-fitted-to-a-leadwell-cnc-vmc
>
> sorry should of said the title etc
>
> you can always find me on IRC under the name, rob_h
> 31A im sure i have a manual ill look at work today migth be lucky and
> have it in PDF also, some used to be on Mitsubishi website
>
> rob
>

Thank you Rob for the link and for your help! I'm going to check out now
the forum to know a little more about how you did it.

So the drivers work with +/- 10 volts, that's great because I couldn't find
anything about that yet, but anyway I could measure the input of the
drivers since the machine is working.


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Re: [Emc-users] Running Mitsubishi Meldas DC servo motors with LinuxCNC

[Leonardo Marsaglia]

2014-11-20 7:41 GMT-03:00 andy pugh :

> Indeed, once you find where the analogue voltage has to go and which
> wire is which on the resolvers it should all be relatively simple.
>
> With apologies to jon@pico-systems (who has a system that would work
> well) I think this sounds like a  perfect fit for the Mesa 5i24 and
> 7i49 combination. Depending on how much GPIO you need you would
> probably also want one or two 7i37TA boards too. (or if you need more
> GPIO than that, possibly 7i44 + N * smart-serial GPIO boards)
>
> I don't see any mention of Resolver interfaces on the General
> Mechatronics site.
>

It looks really less difficult than I thought now. I was afraid because in
the Mazak VMC from the wiki the author decided to replace the drives.

What I have to do know is to look for some information about the resolvers
and I think I could try it out in the near future (January most likely). My
idea is to make the first test without touching anything on the original
CNC. I think I'm going to put the PC next to the machine and move the
servos and try to tune them.

The other thing I need to control is the turret DC motor, now it's working
with hall sensors only, I guess some hal logic will work just fine.


-- 
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Re: [Emc-users] Motor Resolvers

[Rene Hopf]

> On 20 Nov 2014, at 19:14, andy pugh  wrote:
> 
> On 20 November 2014 17:56, Kirk Wallace  wrote:
>> I seem to recall, to get fast PWM, I had to use Timer1 and not use the
>> Arduino PWM library. I wonder if the resolver decoder might be improved
>> in a similar fashion? I haven't had the time to study Andy's code, but
>> it may already be optimized.
> 
> It is all driven by interrupts and direct register writes, it doesn't
> use any Arduino libraries at all, not for PWM generation, not for
> analogue reading and not even for computing the arctan.
> (it uses an integer-only algorithm and a lookup table)
> 
> http://wiki.linuxcnc.org/uploads/Resolver.pde

My servo amp has a very good resolver interface, featuring 10kHz excitation 
with driver(8Vpp signal, to reduce noise), lowpass filter, and 12 bit 
resolution.
included are eagle files, spice simulation, and code.
It could be used to make a converter to other interfaces, or you can just use 
the whole project to drive your servos.
It has even got a hal implementation to configure things at runtime.

https://github.com/rene-dev/stmbl

Rene


> 
> 
> -- 
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
> --
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> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
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Re: [Emc-users] Latest Linux Build

[Dave Cole]

MTW  is really difficult to route. I've been using 18 gauge UL1007 300 
volt stranded hook up wire for that.   Its a dream to use compared to MTW.

Once you use it, you will never use MTW for that again.I order it 
online.

Dave

On 11/20/2014 12:47 PM, Rick Lair wrote:
> The 7I80, and 7I49 are symmetrical, they are both 4" x 4", but the 7I70
> and 7I71 are not, and those are the more critical ones to have
> orientated this way. 48 number 16 MTW wires routed to each of these
> boards would look like crap with the board 90 degrees off.
>
>
> Thanks
>
>
> Rick
>
>
>
> -- Original Message --
> From: emc-users-requ...@lists.sourceforge.net
> To: emc-users@lists.sourceforge.net
> Sent: 11/20/2014 12:25:30 PM
> Subject: Emc-users Digest, Vol 103, Issue 56
>
>> Send Emc-users mailing list submissions to
>>   emc-users@lists.sourceforge.net
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>>   https://lists.sourceforge.net/lists/listinfo/emc-users
>> or, via email, send a message with subject or body 'help' to
>>   emc-users-requ...@lists.sourceforge.net
>>
>> You can reach the person managing the list at
>>   emc-users-ow...@lists.sourceforge.net
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Emc-users digest..."
>>
>>
>> Today's Topics:
>>
>> 1. Re: Screw Mapping (Mark Wendt)
>> 2. Re: Motor Resolvers (Marius Liebenberg)
>> 3. Re: Screw Mapping (Gene Heskett)
>> 4. Re: i guess i need a new motherboard for new linuxcnc
>>(Peter C. Wallace)
>> 5. Re: i guess i need a new motherboard for new linuxcnc (andy pugh)
>> 6. Re: Latest Linux Build (Marius Liebenberg)
>> 7. Re: i guess i need a new motherboard for new linuxcnc
>>(Peter C. Wallace)
>> 8. Re: Motor Resolvers (andy pugh)
>>
>>
>> --
>>
>> Message: 1
>> Date: Thu, 20 Nov 2014 08:41:59 -0500
>> From: Mark Wendt 
>> Subject: Re: [Emc-users] Screw Mapping
>> To: "Enhanced Machine Controller (EMC)"
>>   
>> Message-ID:
>>   
>> Content-Type: text/plain; charset=UTF-8
>>
>> On Thu, Nov 20, 2014 at 8:25 AM, andy pugh  wrote:
>>
>>>   On 20 November 2014 13:07, Mark Wendt  wrote:
>>>
>>>   >> Using 16 I get
>>>   >> http://ibin.co/1htLwap6mz37
>>>
>>>   > Ah ha! Thanks for that. Appreciate the help Andy!
>>>
>>>   Actually, you can do better than that. Because Lincurve doesn't
>>>   extrapolate you can drop the (0,0) point and add a (7,0) point to
>>> make
>>>   the fit better.
>>>
>>>   --
>>>   atp
>>>   If you can't fix it, you don't own it.
>>>   http://www.ifixit.com/Manifesto
>>>
>>
>> Thanks! I'll take a look at that too.
>>
>> Mark
>>
>>
>> --
>>
>> Message: 2
>> Date: Thu, 20 Nov 2014 16:29:51 +0200
>> From: Marius Liebenberg 
>> Subject: Re: [Emc-users] Motor Resolvers
>> To: emc-users@lists.sourceforge.net
>> Message-ID: <546dfadf.7040...@mastercut.co.za>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>>
>> On 2014-11-18 20:28, andy pugh wrote:
>>>   On 18 November 2014 17:33, Kirk Wallace 
>>> wrote:
   The more I think about it, adding Halls seems to be the way to go.
>>>   Resolvers are _really_ good transducers. It seems a shame not to use
>>> them.
>>>
>>>   I have no boards left. But I can pass on the files to have a batch of
>>>   PCBs made ($10 for 10 boards at seeedstudio.com )
>>>
>>>   The results were disappointing for position feedback, but sending 3
>>>   emulated Hall signals from Arduino GPIO and nothing else ought to
>>> work
>>>   pretty well. Each Arduino does 3 motors.
>> Andy why were you disappointed with the position feedback.
>> Will it be ok on a slow moving bed?
>> Do you think a more powerful MCU will do the trick?
>>
>>
>> --
>>
>> Regards /Groete
>>
>> Marius D. Liebenberg
>> +27 82 698 3251
>> +27 12 743 6064
>> QQ 1767394877
>>
>>
>>
>>
>> --
>>
>> Message: 3
>> Date: Thu, 20 Nov 2014 11:33:45 -0500
>> From: Gene Heskett 
>> Subject: Re: [Emc-users] Screw Mapping
>> To: emc-users@lists.sourceforge.net
>> Message-ID: <201411201133.45148.ghesk...@wdtv.com>
>> Content-Type: Text/Plain; charset="windows-1256"
>>
>> On Thursday 20 November 2014 06:47:41 Mark Wendt did opine
>> And Gene did reply:
>>>   On Thu, Nov 20, 2014 at 6:38 AM, andy pugh 
>>> wrote:
>>>   >
>>> https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD
>>>   > 3Od7SsPfnqxXBg/edit#gid=740055151
>>>   >
>>>   > > Whatcha think? Easy enough to do?
>>>   >
>>>   > Looks like you should get a nice fit with 14 points.
>>>   >
>>>   >
>>>   > --
>>>   > atp
>>>   > If you can't fix it, you don't own it.
>>>   > http://www.ifixit.com/Manifesto
>>>
>>>   Andy,
>>>
>>>   How would you fit it into 14 points? I seem to come up with quite a
>>>   few more points than 14.
>>>
>>>   Mark
>> Pick your most + point, and your most - point, plus the start point and
>> end points, and apply that c

Re: [Emc-users] Latest Linux Build

[Marius Liebenberg]

Ah, I was under the impression that they are all the same size.
Yes I agree that would not look very good. I use a multi strand 0.8mm 
sqr wire with bootlace on every wire. Then it is not that crowded around 
the connectors.

If one could get just the bottom piece of the din rail fitting from 
Peter then it would be easy to replace the piece of aluminium to fit the 
4x4 boards.
I wonder if he has that piece made up for him or if it is available on 
the market?


On 2014-11-20 19:47, Rick Lair wrote:
> The 7I80, and 7I49 are symmetrical, they are both 4" x 4", but the 7I70
> and 7I71 are not, and those are the more critical ones to have
> orientated this way. 48 number 16 MTW wires routed to each of these
> boards would look like crap with the board 90 degrees off.
>
>
> Thanks
>
>
> Rick
>
>
>
> -- Original Message --
> From: emc-users-requ...@lists.sourceforge.net
> To: emc-users@lists.sourceforge.net
> Sent: 11/20/2014 12:25:30 PM
> Subject: Emc-users Digest, Vol 103, Issue 56
>
>> Send Emc-users mailing list submissions to
>>   emc-users@lists.sourceforge.net
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>>   https://lists.sourceforge.net/lists/listinfo/emc-users
>> or, via email, send a message with subject or body 'help' to
>>   emc-users-requ...@lists.sourceforge.net
>>
>> You can reach the person managing the list at
>>   emc-users-ow...@lists.sourceforge.net
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Emc-users digest..."
>>
>>
>> Today's Topics:
>>
>> 1. Re: Screw Mapping (Mark Wendt)
>> 2. Re: Motor Resolvers (Marius Liebenberg)
>> 3. Re: Screw Mapping (Gene Heskett)
>> 4. Re: i guess i need a new motherboard for new linuxcnc
>>(Peter C. Wallace)
>> 5. Re: i guess i need a new motherboard for new linuxcnc (andy pugh)
>> 6. Re: Latest Linux Build (Marius Liebenberg)
>> 7. Re: i guess i need a new motherboard for new linuxcnc
>>(Peter C. Wallace)
>> 8. Re: Motor Resolvers (andy pugh)
>>
>>
>> --
>>
>> Message: 1
>> Date: Thu, 20 Nov 2014 08:41:59 -0500
>> From: Mark Wendt 
>> Subject: Re: [Emc-users] Screw Mapping
>> To: "Enhanced Machine Controller (EMC)"
>>   
>> Message-ID:
>>   
>> Content-Type: text/plain; charset=UTF-8
>>
>> On Thu, Nov 20, 2014 at 8:25 AM, andy pugh  wrote:
>>
>>>   On 20 November 2014 13:07, Mark Wendt  wrote:
>>>
>>>   >> Using 16 I get
>>>   >> http://ibin.co/1htLwap6mz37
>>>
>>>   > Ah ha! Thanks for that. Appreciate the help Andy!
>>>
>>>   Actually, you can do better than that. Because Lincurve doesn't
>>>   extrapolate you can drop the (0,0) point and add a (7,0) point to
>>> make
>>>   the fit better.
>>>
>>>   --
>>>   atp
>>>   If you can't fix it, you don't own it.
>>>   http://www.ifixit.com/Manifesto
>>>
>>
>> Thanks! I'll take a look at that too.
>>
>> Mark
>>
>>
>> --
>>
>> Message: 2
>> Date: Thu, 20 Nov 2014 16:29:51 +0200
>> From: Marius Liebenberg 
>> Subject: Re: [Emc-users] Motor Resolvers
>> To: emc-users@lists.sourceforge.net
>> Message-ID: <546dfadf.7040...@mastercut.co.za>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>>
>> On 2014-11-18 20:28, andy pugh wrote:
>>>   On 18 November 2014 17:33, Kirk Wallace 
>>> wrote:
   The more I think about it, adding Halls seems to be the way to go.
>>>   Resolvers are _really_ good transducers. It seems a shame not to use
>>> them.
>>>
>>>   I have no boards left. But I can pass on the files to have a batch of
>>>   PCBs made ($10 for 10 boards at seeedstudio.com )
>>>
>>>   The results were disappointing for position feedback, but sending 3
>>>   emulated Hall signals from Arduino GPIO and nothing else ought to
>>> work
>>>   pretty well. Each Arduino does 3 motors.
>> Andy why were you disappointed with the position feedback.
>> Will it be ok on a slow moving bed?
>> Do you think a more powerful MCU will do the trick?
>>
>>
>> --
>>
>> Regards /Groete
>>
>> Marius D. Liebenberg
>> +27 82 698 3251
>> +27 12 743 6064
>> QQ 1767394877
>>
>>
>>
>>
>> --
>>
>> Message: 3
>> Date: Thu, 20 Nov 2014 11:33:45 -0500
>> From: Gene Heskett 
>> Subject: Re: [Emc-users] Screw Mapping
>> To: emc-users@lists.sourceforge.net
>> Message-ID: <201411201133.45148.ghesk...@wdtv.com>
>> Content-Type: Text/Plain; charset="windows-1256"
>>
>> On Thursday 20 November 2014 06:47:41 Mark Wendt did opine
>> And Gene did reply:
>>>   On Thu, Nov 20, 2014 at 6:38 AM, andy pugh 
>>> wrote:
>>>   >
>>> https://docs.google.com/spreadsheets/d/1ovcg0THudgyONfH508BG4_mzOxfuD
>>>   > 3Od7SsPfnqxXBg/edit#gid=740055151
>>>   >
>>>   > > Whatcha think? Easy enough to do?
>>>   >
>>>   > Looks like you should get a nice fit with 14 points.
>>>   >
>>>   >
>>>   > --
>>>   > atp
>>>   > If you can't fix it, you don't own it.
>>>   > http://www.ifixit.com/Manifesto
>>>
>>>   Andy,