[Emc-users] Anyone use "O-Drive" motor drivers?

[Chris Albertson]

Does anyone here have experience using "O Drive" for a machine tool
application?   These were designed for use with robotics but it looks like
they are ideal for a high-performance milling machine.  It is Open-source.
The firmware and hardware schematics are on GitHub.

https://odriverobotics.com

These drive common and cheap three-phase brushless motors using shaft
encoders and any of several inputs like step/dir, CAN, analog, USB or
serial.   Power is up to 56 volts and over 100 amps peak.   $150 for a
two-axis controller.  They can be drop-in replacements for stepper
motors but can also do much more.

A PID loop runs inside this controller so you can set the velocity over the
interface or just send step/dir and know that the internal feedback will
make sure no steps are skipped.

-- 

Chris Albertson
Redondo Beach, California

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[Emc-users] machDrives

[Marshland Engineering]

I tried the Machdrives card yesterday and it worked very well. 
https://www.machdrives.com/brb.aspx

If I'm running step and direction, with linear scales, I was wondering if I
could parallel up the linear scales output to the PC so I could still use
LinuxCNC as a DRO. Can this be done?

Thanks Wallace. 



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Re: [Emc-users] Yaskawa Servopacks with Mesa

[Les Newell]

Hi Marius,

When you hit Estop do the drives power down completely? If so, you might 
as well stick with step/dir without encoder feedback. With step/dir the 
only thing encoder feedback will do for you is let you track the 
machine's movement when it is in estop. If the drives power down you 
lose that advantage.


For instance the SGDA drives on my Hurco are powered just from 220V AC. 
If I hit Estop that 220V goes away and the machine has no way of 
tracking it's movement. It then needs to be re-homed when taken out of 
estop. Some drives have a separate logic supply that keeps the encoders 
powered even in Estop. Both my router and lathe are set up that way so 
you only need to home once when you first power the machine up for the day.


For safety reasons I prefer to leave machines in estop if they are going 
to be left unused for more than a few minutes. This makes the Hurco a 
bit tedious as I often need to re-home.


Les


On 04/12/2019 19:16, Marius wrote:

Hi Les

Thanks for the feedback. I agree with using the analog option but in 
this case the motors are already tuned and wired. As long as I have 
the encoder feedback, I am sure that the system will be accurate 
enough (I hope)


I dont have a lot of time to do the conversion in so I might have to 
use the STEP/DIR option. The machine is working fine now but for the 
hand held (Chinese) controller that is erratic to say the least.


On 2019/12/04 13:51, Les Newell wrote:

Hi Marius,

If I was doing it I'd go with a 7I97 and use analog control for the 
drives. My Hurco mill uses older SGDA08 drives and I use analog 
control in torque mode. I used to run the drives in velocity mode but 
I found I got better accuracy in torque mode with no dithering at 
rest. With velocity mode you always end up with the drive hunting 
between encoder counts when at rest.


The only advantage of using a 7I95 is that you can use the existing 
drive tuning so you don't need to worry about setting up the PID 
loops. You'll probably get better accuracy with analog control but 
for a router the difference is probably too small to have a 
measurable effect on your final parts.


Les

On 04/12/2019 09:31, Marius wrote:

Hi

I have been requested to convert a router that has Yaskawa Servo 
Packs (SGD7S with analog and step/dir and encoders) already 
installed. The installation makes use of the STEP/DIR signals 
currently but with no encoder feedback.


I intend to use the Mesa 7I95 to replace the Chinese controller. My 
question is: Is it ok to use the STEP/DIR feature of this servo pack 
with encoder feedback to LCNC or should I go the Analog route and 
redo the complete system making use of the 7I97.



Regards

Marius






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Re: [Emc-users] Yaskawa Servopacks with Mesa

[Marius]

On 2019/12/04 18:41, Mark Johnsen wrote:

Marius,

You need to see what kind of encoder the Yaskawa motor has on it.  I recall
many of them were serial w/ a proprietary Yaskawa protocol, which would
make it hard to run the encoder directly back to the mesa.

Possibly, the servo pack has an 'encoder out' feature that you could run
back to the mesa.  Sometimes those encoder out features are standard
quadrature A, B, Z outputs...  That would work well.


Yes Mark that is the case here.



Mark

On Wed, Dec 4, 2019 at 1:31 AM Marius  wrote:


Hi

I have been requested to convert a router that has Yaskawa Servo Packs
(SGD7S with analog and step/dir and encoders) already installed. The
installation makes use of the STEP/DIR signals currently but with no
encoder feedback.

I intend to use the Mesa 7I95 to replace the Chinese controller. My
question is: Is it ok to use the STEP/DIR feature of this servo pack
with encoder feedback to LCNC or should I go the Analog route and redo
the complete system making use of the 7I97.


Regards

Marius



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Re: [Emc-users] Yaskawa Servopacks with Mesa

[Jon Elson]

On 12/04/2019 10:41 AM, Mark Johnsen wrote:

Marius,

You need to see what kind of encoder the Yaskawa motor has on it.  I recall
many of them were serial w/ a proprietary Yaskawa protocol, which would
make it hard to run the encoder directly back to the mesa.

Possibly, the servo pack has an 'encoder out' feature that you could run
back to the mesa.  Sometimes those encoder out features are standard
quadrature A, B, Z outputs...  That would work well.


Yes, the slightly older Servo Pack drives I worked with all 
had this feature.  they converted the proprietary
Yaskawa encoder signals to industry-compatible quadrature 
plus index signals in the drive.


Jon


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Re: [Emc-users] Yaskawa Servopacks with Mesa

[Mark Johnsen]

Marius,

You need to see what kind of encoder the Yaskawa motor has on it.  I recall
many of them were serial w/ a proprietary Yaskawa protocol, which would
make it hard to run the encoder directly back to the mesa.

Possibly, the servo pack has an 'encoder out' feature that you could run
back to the mesa.  Sometimes those encoder out features are standard
quadrature A, B, Z outputs...  That would work well.

Mark

On Wed, Dec 4, 2019 at 1:31 AM Marius  wrote:

> Hi
>
> I have been requested to convert a router that has Yaskawa Servo Packs
> (SGD7S with analog and step/dir and encoders) already installed. The
> installation makes use of the STEP/DIR signals currently but with no
> encoder feedback.
>
> I intend to use the Mesa 7I95 to replace the Chinese controller. My
> question is: Is it ok to use the STEP/DIR feature of this servo pack
> with encoder feedback to LCNC or should I go the Analog route and redo
> the complete system making use of the 7I97.
>
>
> Regards
>
> Marius
>
>
>
> ___
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Re: [Emc-users] Yaskawa Servopacks with Mesa

[Todd Zuercher]

There really isn't any issue I know of with using step/dir with encoder 
feedback.  (I currently am with a 5i25/7i85s combo.) And having the encoder 
feedback can be nice for tuning the drives, if the drive's set up software 
doesn't provide any internal "scope" feature.

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-Original Message-
From: Marius  
Sent: Wednesday, December 04, 2019 4:31 AM
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Yaskawa Servopacks with Mesa

Hi

I have been requested to convert a router that has Yaskawa Servo Packs (SGD7S 
with analog and step/dir and encoders) already installed. The installation 
makes use of the STEP/DIR signals currently but with no encoder feedback.

I intend to use the Mesa 7I95 to replace the Chinese controller. My question 
is: Is it ok to use the STEP/DIR feature of this servo pack with encoder 
feedback to LCNC or should I go the Analog route and redo the complete system 
making use of the 7I97.


Regards

Marius



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Re: [Emc-users] parallel port picie cards

[andy pugh]

On Wed, 4 Dec 2019 at 03:21, R C  wrote:

> what would be a good PCIe card t use with linux-cnc,  would any card
> that does ECP/EPP do?

You might want to look at the Mesa 6i25. It's not a parallel card, but
it can behave like one.
The onboard FPGA can generate step pulses and count encoders at MHz
frequencies, though.

Well supported by LinuxCNC.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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[Emc-users] Yaskawa Servopacks with Mesa

[Marius]

Hi

I have been requested to convert a router that has Yaskawa Servo Packs 
(SGD7S with analog and step/dir and encoders) already installed. The 
installation makes use of the STEP/DIR signals currently but with no 
encoder feedback.


I intend to use the Mesa 7I95 to replace the Chinese controller. My 
question is: Is it ok to use the STEP/DIR feature of this servo pack 
with encoder feedback to LCNC or should I go the Analog route and redo 
the complete system making use of the 7I97.



Regards

Marius



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Re: [Emc-users] parallel port picie cards

[Gene Heskett]

On Wednesday 04 December 2019 03:25:20 Chris Albertson wrote:

> Mesa FPGA cards are so cheap now are parallel port cards worth it?
> Dramatically better performance for not much difference in cost
>
I'd argue about the diff in cost. A 5i25 is still about $60 more 
expensive than an EPP parport, card.  The 7i90 for pi based stuff is 
roughly comparable to the 5i25 for wintel stuff, but it really needs a 
trio of 7i42TA's to make it useable as I don't consider the 7i90's 50 
pin scsi sockets at all useable. The 7i90/7i42TA combo is a more capable 
combo. The 7i42TA's not only snub the noise that can and has blown the 
7i90's, they also supply easily wired terminal strips. But that does put 
the 7i90/7i42's at a bit more than $200. You do get a lot more control 
lines though.

So the $25 parport card, driving a $23 SainSmart BoB, is still about the 
cheapest starter kit around. The SainSmart has no speed limiting 
opto-isolators in its outputs, a huge advantage as the stepper drivers 
seem to include those anyway. I can't say the same for its inputs, but 
in case you've a very high speed encoder, they are easily bypassable by 
anyone who can trace the circuitry.

> On Tue, Dec 3, 2019 at 7:21 PM R C  wrote:
> > Hello,
> >
> >
> > what would be a good PCIe card t use with linux-cnc,  would any card
> > that does ECP/EPP do?
> >
> >
> > thanks,
> >
> >
> > Ron
> >
> >
> >
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Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] parallel port picie cards

[Chris Albertson]

Mesa FPGA cards are so cheap now are parallel port cards worth it?
Dramatically better performance for not much difference in cost

On Tue, Dec 3, 2019 at 7:21 PM R C  wrote:
>
> Hello,
>
>
> what would be a good PCIe card t use with linux-cnc,  would any card
> that does ECP/EPP do?
>
>
> thanks,
>
>
> Ron
>
>
>
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-- 

Chris Albertson
Redondo Beach, California


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