I may have a nice project of retrofitting a lathe (about 20kW, quite a
nice toy, but with an old control that is dead)
I tested servo driver, they work. So basicely, all I need is:
- 3 output +- 10V (to give speed consign to servo amplifier)
- 4 quadrature input encoder (I checked this,
On 21 January 2016 at 16:53, Claude Froidevaux wrote:
> I would also love to have analog input on MESA card, but this does not
> seems to exist. anyone to confirm ?
Some of the smart-serial cards offer analogue input on some channels.
> Idea is to use MESA 7I33TA for +-10V
That is not true at all.
LinuxCNC supports a fairly wide range of I/O devices.
Jon Elson offers a line of products that we have drivers for.
We also have drivers for a couple of older servo boards, but the manufacturers
of those boards haven't been keeping up with the changes in the computer
2016-01-21 18:53 GMT+02:00 Claude Froidevaux :
> I may have a nice project of retrofitting a lathe (about 20kW, quite a
> nice toy, but with an old control that is dead)
> I tested servo driver, they work. So basicely, all I need is:
> - 3 output +- 10V (to give
7i87 is a +-10vdc analog input card. Connects on the sserial connectors of
say a 7i77.
There's at least 3 ways to use a 7i77. I think pci 5i25, pcie 6i25 and
ethernet (7i80 or something close to that).
I'm a little puzzled.
Lately the discussion on servos and LinuxCNC appears to give the impression
that the only solution is a PC and boards from Mesa. Does that mean
LinuxCNC has now become a defacto Mesa product?
Either stepper motors and an older PC that supports parallel port or if you
On 21 January 2016 at 18:41, John Dammeyer wrote:
> Either stepper motors and an older PC that supports parallel port or if you
> want servos that aren't driven with a Gecko Step/Dir input (much like a
> stepper motor) then it's a Mesa product or nothing?
Not at all.
On 21 January 2016 at 22:45, Stuart Stevenson wrote:
> I desire to use an absolute encoder.
> I will work that direction if someone will point me to a good starting
What sort of absolute encoder? What do you want to do with it?
If you can't fix
I hadn't seen this mentioned on the list, but maybe I missed it, or I
read it and my old brain forgot.
I had a few old used PCs that I purchased for LinuxCNC 2.5.x. I ran the
latency test before buying them and the results were fairly good. Then
I decided to standardize on Atom motherboards
On 21 January 2016 at 23:23, Stuart Stevenson wrote:
> I think a resolver would be the way to go.
Possibly not enough resolution for a rotary table.
Something like the Heidenhain angle encoders might be better, they
turn up on eBay occasionally.
My definition of absolute encoder for this exercise is as follows:
Given a rotary table of infinite rotations I want the encoder to count to
359.( depending on resolution) and the next position to be 0.000.
The axis position of 90 degrees is always the same place.
The sign +/-
On 21 January 2016 at 22:26, claude wrote:
> - This can be ethercat, as much as I know, there is no driver for
> linuxcnc. Also, hardware is quite expensive.
There is, but licensing problems mean that it can't be a part of LinuxCNC.
Well, to give my understanding,
To have a real time interface to physical world, there is the need to
use some hardware. When you speak about hardware, you mean as well
driver, and this start to be quite complicated.
- This can be ethercat, as much as I know, there is no driver for
I desire to use an absolute encoder.
I will work that direction if someone will point me to a good starting
having some fun now
Addressee is the intended audience.
If you are not the addressee then my consent is not given for you to read
this email furthermore it is
On 01/21/2016 12:41 PM, John Dammeyer wrote:
> I'm a little puzzled.
> Lately the discussion on servos and LinuxCNC appears to give the impression
> that the only solution is a PC and boards from Mesa. Does that mean
> LinuxCNC has now become a defacto Mesa product?
Well, I sure hope not!
I can't say for certain without knowing more about exactly what you have but
Fanuc of that era should use ordinary encoders, fed directly to the control,
the control then sends a synthetic analog tacho singnal and analog control
signals back to the servo amps, which are fairly ordinary DC servo
I just went to look at a '80s Bridgeport VMC with Heidenhain controller
and Fanuc yellow cap servos (didn't get inside a cabinet for closer
investigation - yet). The beast has a tool changer and a bad controller.
Anyone have experience with that particular configuration? Particularly,
Heidenhain also sells absolute encoders that output SSI.
I've used them before. They are expensive. As I recall $800-$900 for
a rotary one.
If they are wired wrong they can easily be destroyed... An electrician
kept changing the wiring and destroyed two of them before I could
I've used the AS5048B in a robotics application. Note that the magnet must
have a transverse magnetic orientation rather than the axial orientation of
most rare earth magnets.
> -Original Message-
> From: Mark Johnsen [mailto:m...@ijohnsen.com]
> Sent: Thursday, January 21, 2016 7:34 PM
Hello fellow users;
Today I will ask for clarity in understanding Smart serial usage.
>From the many docs I have read so far it appears to rule out SSerial as a
>single point to point only interface and that the devices are somehow linked
>via hub or a daisy chain. Which is it?
I picked up a
On Thursday 21 January 2016 18:37:39 Bruce Layne wrote:
> I hadn't seen this mentioned on the list, but maybe I missed it, or I
> read it and my old brain forgot.
> I had a few old used PCs that I purchased for LinuxCNC 2.5.x. I ran
> the latency test before buying them and the results were
You can buy demo boards from digikey and I think they have versions up to
14bit (?). 12 bit for sure. Also, they have ABI output (channel a,
channel b, and index) as well as pwm and ssi. Hmm, ABI wouldn't work
My friend speculated that maybe the updates that installed (over 60 MB
worth of packages) included a different video driver that greatly
decreased the latency problem and I commented that this seemed like a
probable explanation based on my limited knowledge. The difference was
On 1/21/2016 6:16 PM, Bruce Layne wrote:
> BTW - If anyone is looking for a rigid little 12" X 12" desktop CNC
> router, the C-Beam Machine from OpenBuild
> The structure seemed rigid but the stepper motor sounds
> seemed to be resonating in the aluminum frame and the resonant
> frequencies were
Once I convinced my friend that the noise wasn't the result of some
problem with the stepper motors and seemed to be greatly amplified at
resonant frequencies, we quickly brainstormed a couple of fixes
involving various extrusion fills and RTV silicone was at the top of our
list. Great minds
Thanks. I realize the question was about specific Mesa choices but at one
point it was like "I have a servo, what Mesa card do I use?" Not stated was
whether there were any options. Like "I have a servo, what's the best
servo/encoder controller out there?"
So I was curious.
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