there is a small description in the source code:
'compute_screw_comp()' is responsible for calculating backlash and
lead screw error compensation. (Leadscrew error compensation is
a more sophisticated version that includes backlash comp.) It uses
the velocity in emcmotStatus->joint_vel_
On 24 Jan 2020, at 05:07, David Berndt wrote:
>
> I'm having a bit of an issue with some geometry not coming out as expected, I
> was hoping that being able to see what backlash comp is doing on screen.
It would also be very useful to understand the algorithm being used to apply
backlash comp
Comments between.
> -Original Message-
> From: bari [mailto:bari00...@gmail.com]
> The guy down the hall from me has been keeping RTAI alive for LCNC the
> past few years. I'm not sure if real time performance would be much
> better using QNX vs Linux + RTAI on a PC.
I think one first has
Hello All,
I'm having a bit of an issue with some geometry not coming out as
expected. I suspect it's related to backlash and cutting forces moving the
table a bit but I don't have linear scales to monitor/correct for that
sort of thing so I'm left wondering a bit. I was hoping that being a
The guy down the hall from me has been keeping RTAI alive for LCNC the
past few years. I'm not sure if real time performance would be much
better using QNX vs Linux + RTAI on a PC.
http://blackberry.qnx.com/en/software-solutions/embedded-software/industrial/qnx-nuetrino-rtos
There would be trade-
On Thursday 23 January 2020 21:09:17 Dale Ertley via Emc-users wrote:
> Hello all,I was going to try the new LinuxCNC 2.7.15 releace but I can
> not find the download.The page is there with a list of the new
> contributors and the many things that have been fixed.Just can't seem
> to find where to
Hello all,I was going to try the new LinuxCNC 2.7.15 releace but I can not find
the download.The page is there with a list of the new contributors and the many
things that have been fixed.Just can't seem to find where to download.Also is
2.7.15 setup to be put on a USB drive to install?Thank you
On 01/23/2020 06:52 PM, R C wrote:
I always wondered why FPGAs are(still?) that popular...
Because you can develop quite a bit of custom logic on a $10
chip. One of my motion controller
boards packs 4 quadrature counters capable of up to 5
million counts/second and 4 PWM generators
with a 40
On 01/23/2020 03:42 PM, Andy Pugh wrote:
On 23 Jan 2020, at 22:03, John Dammeyer wrote:
It's likely the real number of LinuxCNC users is way way larger than one
thinks. Might even exceed HAAS systems by an order of magnitude.
I think PCW mentioned 10,000 boards of a particular type out i
I always wondered why FPGAs are(still?) that popular...
Way back when, in some research work I did, in my field they were mostly
used for building stuff that didn't exist, as a test bed.
For fun we once implemented a univac on it, because we could.
Ron
On 1/23/20 12:29 PM, Peter C. Wall
That is definitely true, I think. Also, I think that RTOS is sort of a
left-over from a few decades ago, because back then ther were no
other options. Nowadays it still has a place, although of course there
are different way more sophisticated solutions.
That pretty much works the same is i
I seem to recall stumbling across a post regarding a high current draw
between the Spindle + and Spindle - (7i76-TB4 pins 1 and 3), but I'll be
darned if I can find it now using the full might of Google. My question
is this: is there any problem using 5V from the cable/host interface to
pow
> -Original Message-
> From: Andy Pugh [mailto:bodge...@gmail.com]
> Sent: January-23-20 1:42 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Real-time OS for machine controllers
>
>
>
> > On 23 Jan 2020, at 22:03, John Dammeyer
> wrote:
> >
> > It's likely the re
I don't know how many machines a month Haas sells now but around the year
2000 they were selling 1000 a month.
On Thu, Jan 23, 2020, 3:44 PM Andy Pugh wrote:
>
>
> > On 23 Jan 2020, at 22:03, John Dammeyer wrote:
> >
> > It's likely the real number of LinuxCNC users is way way larger than
> on
> On 23 Jan 2020, at 22:03, John Dammeyer wrote:
>
> It's likely the real number of LinuxCNC users is way way larger than one
> thinks. Might even exceed HAAS systems by an order of magnitude.
I think PCW mentioned 10,000 boards of a particular type out in the wild.
__
On Thursday 23 January 2020 13:17:44 Chris Albertson wrote:
> The trouble with the Mesa FPGA design is that it depends on a computer
> with good real-time performance. It can generate steps but I don't
> thing you can run a position or velocity PID control loop on the FPGA.
>
> You asked about "
> -Original Message-
> From: Peter C. Wallace [mailto:p...@mesanet.com]
> > Date: Thu, 23 Jan 2020 10:17:44 -0800
> > From: Chris Albertson
> >
> > The trouble with the Mesa FPGA design is that it depends on a computer
> with
> > good real-time performance. It can generate steps but I
On Thu, 23 Jan 2020, Chris Albertson wrote:
Date: Thu, 23 Jan 2020 10:17:44 -0800
From: Chris Albertson
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] Real-time OS for machine controllers
The trouble with the Mesa FPGA desig
The trouble with the Mesa FPGA design is that it depends on a computer with
good real-time performance. It can generate steps but I don't thing you
can run a position or velocity PID control loop on the FPGA.
You asked about "my controler". No this is not my idea, this is how most
current desig
PCs are cheap, easily available and easy to code on. They provide huge
amounts of processing power for little money and are very well suited to
GUI applications. However they are not designed for hard real time work.
LinuxCNC does a good job but even then it tends to be a bit touchy if
not pair
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