Vidarebefordrat meddelande
Ämne: Re: [Emc-users] Glade-3 on Rpi
Datum: Wed, 7 Apr 2021 19:17:52 +0200
Från: Nicklas SB Karlsson
Till: Ralph Stirling
Den 2021-04-06 kl. 17:59, skrev Ralph Stirling:
I seem to be plagued by things that I thought I had working
but
Den 2021-04-05 kl. 21:48, skrev Karl Schmidt:
On 3/19/21 4:53 AM, andy pugh wrote:
Here is a schematic of a typical LinuxCNC spindle orient setup:
https://wiki.linuxcnc.org/uploads/orient.svg
I've updated the svg - but I think it might be missing the
spindle-index-enable connection?
Does th
31 AM, andy pugh wrote:
On Wed, 24 Mar 2021 at 05:13, Nicklas SB Karlsson
wrote:
Anybody have any idea about the insertion/removal force of die
guide posts?
No.
Trying to work out what you are asking, it sounds like you might be
planning to buy a hydraulic press, but do not know what force you
Anybody have any idea about the insertion/removal force of die guide posts?
Up to 20ton is common and available cheap but larger is multiple times
more expensive. Have small pile of soldering irons, some good some not,
they are they are cheap so no big problem but not want the same thing to
ha
Den 2021-03-19 kl. 10:53, skrev andy pugh:
On Fri, 19 Mar 2021 at 01:46, John Dammeyer wrote:
I take it then that you can't actually move the spindle to the index position
unless you have some sort of control beyond velocity?
Velocity control + PID = position control.
Here is a schematic of
Need to orient spindle. Using a quadrature encoder spindle need to be
"homed" by rotating up to one revolution to find index pulse but there
is no homing for spindle. Know what index pulse is in encoder but what
does the index enable signal for spindle do? or how is it used?
There is a float i
Me being a complete novice on stamping tool. Anybody here know how to
fasten guide column?
Supplier have different kinds, some are with larger foot and some clamps
to hold them down. Then they have standard SMS that look perfectly
smooth though marked with diameters Ds6 in one end and Dh4 in t
Den 2021-03-02 kl. 17:20, skrev Roland Jollivet:
Has anyone tried this for holding down PCB's when milling?
https://www.materialsampleshop.com/products/micro-suction-tape
Have an engraver and it have something similar to keep plastic sheet in
place, feels like soft rubber.
__
driver already does most of what you are
discussing. It would be a good place to start if you planned on building
something.
On Sat, Jan 23, 2021, 2:24 PM John Dammeyer wrote:
From: Nicklas SB Karlsson [mailto:nk@nksb.online]
Den 2021-01-23 kl. 01:31, skrev John Dammeyer:
From: andy pugh
Den 2021-02-26 kl. 19:46, skrev R C:
Hello,
this is off topic, but was wondering if anyone knows of any 90 degree
angle nema17 gearboxes (preferably 1:1)
You rally need a 1:1 gearbox?
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Den 2021-01-25 kl. 22:33, skrev Todd Zuercher:
Does anyone have any examples of Classicladder using a Sequential program?
Guess you have to implement it as a state machine?
Came to the conclusion there is two methods to implement programs.
Sequential there program may stop and wait for somethi
Den 2021-01-25 kl. 00:00, skrev dave engvall:
Worst case you find a scrap automotive spring. It is probably
something like 5160. Torch cut a piece. Anneal, forge, mill, grind,
etc to desired shape. Heat until it is not magnetic, quench in oil.
Temper back to about Rc 50. Test. The first try may
Need a small springs, not very many, very simple flat metal. Force in
middle should be around 150N and guess 45mm long, 10mm wide , 0.6mm
thick will do the trick. Anybody have any idea where it is possible to
buy suitable material?
Have been looking on a used handsaw, probably rather good stee
Den 2021-01-23 kl. 01:31, skrev John Dammeyer:
From: andy pugh [mailto:bodge...@gmail.com]
On Fri, 22 Jan 2021 at 23:16, John Dammeyer wrote:
And I take it from your answer that this sort of driver at this point in time
does not exist.
Not as far as I know, but it might be a fairly simple th
Den 2021-01-22 kl. 22:32, skrev John Dammeyer:
Is there an easy way to bring CANopen information into LinuxCNC?
Have done some work on a CiA409-3 gateway including a graphical user
interface, this is for setting parameters. Will most probably spend more
time on this soon. In particular adding
d on to enhance their own machine
tools.
Do not underestimate the Russians. They drink plenty of vodka in average
but also had the great mathematicians Kolmogorov and Galerkin.
Nicklas SB Karlsson
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Spindle will continue to turn a while after, for a smooth stop which
probably is required to not break gear box if machine have that angle
must be known beforehand and control loop tuned so there is no overshoot.
Den 2021-01-03 kl. 23:12, skrev Gregg Eshelman via Emc-users:
Overshoot caused by
As it was discussed before. Trying again I found "check for update and"
button + "update" button download a new appimage, doing it is several
times download it several. To run the new first press quit button and
then execute the new version.
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Then searching for STMBL I found servo drive hardware similar in design
to my servo drive cards. Working on two versions with "standard"
transistors TO220 and TO247 mainly as there are plenty to chose from.
Both should have suitable clearance and creepage for high voltage. Also
an enclosure s
Den 2020-12-12 kl. 22:41, skrev John Dammeyer:
From: Nicklas SB Karlsson [mailto:nk@nksb.online]
To make a link to a file "ln -s filename filename", read manual page
"man ln", I always create the link in the wrong direction first time.
Oh gawd, that would mean using th
To make a link to a file "ln -s filename filename", read manual page
"man ln", I always create the link in the wrong direction first time.
Den 2020-12-12 kl. 19:48, skrev John Dammeyer:
Hi all,
This seems so elementary but has me perplexed.
For the last 30 years or so Microsoft Windows has h
case I could kill them by heating
regularly. Do not freeze during winter is an important future for me as
is now.
Den 2020-10-21 kl. 21:44, skrev marcus.bow...@visible.eclipse.co.uk:
On 2020-10-21 20:10, Nicklas SB Karlsson wrote:
I learned cutting fluid could be unhealthy. Anyone here have any
Did not read very carefully, if you need maybe I could spend a few other
try to get the halscope log file into Octave.
Den 2020-10-21 kl. 20:36, skrev andy pugh:
Does anyone have any investment in a tool to read the halscope log file format?
I am thinking that it is a bit unhelpful at the mom
I learned cutting fluid could be unhealthy. Anyone here have any experience?
First thing I think about is ordinary cooking oil. It might not have the
best performance but as it is more or less just a little bit of hobby
machining unless to bad this is not very important, it is more important
t
I found although not perfect .csv is relatively easy to generate and
read. It might be a good idea to use ; as separator instead of , because
at least in Sweden this is used as a decimal separator.
Octave might be a rather good solution for visualization. It is
relatively easy to produce plots
The theory is that if the PWM signal is high the H-Bridge is switched to
say turn the motor clockwise. If the PWM signal is low
the H-Bridge is switch to turn the motor counter clockwise. Therefore
with 50% the motor is first asked to turn one way and then
the other. That results in the
The theory is that if the PWM signal is high the H-Bridge is switched to say
turn the motor clockwise. If the PWM signal is low
the H-Bridge is switch to turn the motor counter clockwise. Therefore with 50%
the motor is first asked to turn one way and then
the other. That results in the m
Maybe a little bit off topic but Linuxcnc will be used then
manufacturing it. Should make tool for bending of sheet metal, reason is
it is quite many small bends around the edges and I need to try machine
on something. I figured there need to be a pressure pad holding it in
place while a punch
mån 2020-09-28 klockan 18:54 +0100 skrev andy pugh:
> On Mon, 28 Sep 2020 at 18:45, Nicklas SB Karlsson
> wrote:
>
> > I found micrometer have a little bit low resolution to accurately
> > measure backlash not much but it is on the limit.
>
> What do you mean by &
mån 2020-09-28 klockan 09:26 +0100 skrev andy pugh:
> On Sun, 27 Sep 2020 at 17:32, N wrote:
> > I am not immidiately sure if or how it could be done to measure
> > machine accuracy. Anyone here have any idea how to measure it more
> > accurately?
>
> https://www.renishaw.com/en/ballbar-testing-
> On Thursday 23 July 2020 13:34:48 Nicklas SB Karlsson wrote:
>
> > > On Thursday 23 July 2020 07:53:45 andy pugh wrote:
> > > > On Thu, 23 Jul 2020 at 12:47, Nicklas SB Karlsson
> > > >
> > > > wrote:
> > > > > > I wonder wh
> On 07/23/2020 05:09 AM, andy pugh wrote:
> > On Thu, 23 Jul 2020 at 09:22, John Dammeyer wrote:
> >
> >> Not ignoring you at all. Just waiting for an idea for the math that leads
> >> to calculating MAX_ACCELERATION in the ini file given the parameters I've
> >> mentioned before.
> > I think
would be good as if I got it correct
higher viscosity is better at lower speed while lower viscosity is better at
higher speed.
Nicklas SB Karlsson
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> On Thursday 23 July 2020 07:53:45 andy pugh wrote:
>
> > On Thu, 23 Jul 2020 at 12:47, Nicklas SB Karlsson
> >
> > wrote:
> > > > I wonder what effect could be had by rate-limiting the PID output
> > > > to the motors?
> > >
> > &g
> On Thu, 23 Jul 2020 at 12:47, Nicklas SB Karlsson
> wrote:
>
> > > I wonder what effect could be had by rate-limiting the PID output to
> > > the motors?
> >
> > Integrator should ideally have anti-windup.
>
> Anti-windup is a little different.
>
increase following-error (but possibly only
> along the path, where it has less effect on geometry)
Yes, this is because it limit rate of change also for small changes, pretty
sure it also get non-linear. Not sure if it is a good idea but are sure
anti-windup is a good
> On Thu, 23 Jul 2020 at 09:22, John Dammeyer wrote:
>
> > Not ignoring you at all. Just waiting for an idea for the math that leads
> > to calculating MAX_ACCELERATION in the ini file given the parameters I've
> > mentioned before.
>
> I think that the problem is treating the motor as an ide
> On Thu, 23 Jul 2020 at 05:55, John Dammeyer wrote:
> >
> > I've asked a retired physics professor friend for some enlightenment.
>
> I have a PhD in Physics, but seem to be being ignored.
Maybe I missed what you said?
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in CiA 417 as a second option would make sense in CiA 402 which
is for servo motors.
Nicklas SB Karlsson
> A couple of sources:
> http://www.mesanet.com/pdf/motion/softdmc.pdf 50 us cycle -:)
>
> Some years ago a masters candidate in ME at UBC did her thesis on motion
> c
speed and a certain
> acceleration you can get from it.
Not sure the boss will ask mechanical engineer about speed and a certain
acceleration and then give these as a goal to the engineer. It is common boss
read economics and contract but then it come to techni
s acceptable at higher speed. Integrator need som
time to decrease error so it might be hard work to get both at once.
Regards Nicklas SB Karlsson
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> On Sunday 31 May 2020 17:10:10 Nicklas SB Karlsson wrote:
>
> > > On Sunday 31 May 2020 16:32:57 Nicklas SB Karlsson wrote:
> > > > > On Sun, 31 May 2020 at 19:58, Nicklas SB Karlsson <
> > > > >
> > > > > nicklas.karlsso...
> I was about to post the same thing. OpenSCAD s not a general purpose CAD
> system that you can use for machine design.
>
> How to check for clearance: On a normal CAD system you can have commands
> like "move this enough so it contacts this other object." I do that, then
> move it back by th
> On Sunday 31 May 2020 16:32:57 Nicklas SB Karlsson wrote:
>
> > > On Sun, 31 May 2020 at 19:58, Nicklas SB Karlsson <
> > >
> > > nicklas.karlsso...@gmail.com> wrote:
> > > > Remember something about it from Uniersity but only very lit
> On Sun, 31 May 2020 at 19:58, Nicklas SB Karlsson <
> nicklas.karlsso...@gmail.com> wrote:
>
> > Remember something about it from Uniersity but only very little, feed
> > rate, surcface rougness and power requirement. Anybody here know anything
> > about ho
Have used Freecad a little bit and it have a measure function, are not certain
but might happen it used Openscad for rendering. Would guess Freecad look at
the geometry to figure out measure.
> OpenSCAD doesn’t have a measure feature. All that you get is a model preview
> overlaid on a 3D scal
Remember something about it from Uniersity but only very little, feed rate,
surcface rougness and power requirement. Anybody here know anything about how
to calculate suitable feed rate?
Nicklas SB Karlsson
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gt; since that heat will telegraph up the motors 8mm shaft to the PLA, is
> this going to be a life of the sprocket limiting factor because the PLA
> will soften and eventually cold flow to a loose and likely out of
> concentricity warpage?
It
As I understand it servo thread used for Linuxcnc is a Linux real time thread.
Do anybody no if there might be any problems sending messages to a message
queue from a Linuxcnc servo thread? Or a Linux real time task?
Are not sure if receiving also may be useful. Provided non blocking checking of
Ethercat do it this way, guess principle is very similar to using cascade
coupled shift register. JTAG may also use daisy chain.
Have tried to use ordinary SPI in micro controllers in daisy chain but failed
since there was an internal FIFO. It would be really nice if SPI and UART could
be set u
> > ...
> In an open-loop step/direction system, there is no way to
> know a stall happened, except to operator hitting the
> E-stop button (if he is watching!) And, after any E-stop,
> you need to rehome the machine.
>
> But, if you have encoder feedback to the CNC control, then
> you can det
Think it deserve to be mentioned since it is a standard available on many servo
controllers. In CANopen devices can have a FIFO for set reference points, do
not remember the details but could check if you or anyone else want to know?
In CANopen there is a special SYNC message to stay in SYNC. Do
Then running gsch2pcb-rnd it fail to produce output. Do anybody know the status
it is supposed to work? Just with the old .fp footprint files or also with the
new parametric footprints? Sub circuits?
It make difference if I should start too look for a problem with invocation of
program or look
isplays as today?
UNIX came I think in the seventies, then came Windows and now it is Linux which
is very similar to UNIX.
Nicklas SB Karlsson
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python-gtk or something similar?
On Sat, 21 Sep 2019 16:18:03 -0400
Gene Heskett wrote:
> Got the libglib-dev, next is gtk >= 2.4.0
> , and gtk-3-devel does not do it.
>
> Not even aptitude can find it.
>
> fix?
>
> Thanks.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used i
ce so they replaced or are replacing my
ordinary computers while the old ones go for Linuxcnc.
Nicklas SB Karlsson
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I have plenty of stones available at home though not granite instead some kind
of grey alloy, maybe this is the way to build them. Usually they are rather
round or egg shaped so split them in middle would make a good base for two
machines, dig them half way down into the ground they will stand s
> But any OS needs to disable interrupts to access shared memmory or maybe
> for some IO drivers.
I use to get by without disabling interrupts. Then exchanging data most usually
the methodI use is to write data in shared memory and use a variable written to
zero or one to indicate new data is av
> Even th D-525-MW motherboard? I can latency-test for an hour or 2 on this
> machine I'm building up right now, and not show any worse than 5.1
> microseconds for base thread latency, and If I run without that thread,
> which I don't use anyway, and the worst case latency is 4850ns. Thats
> r
On Sat, 2 Mar 2019 13:18:32 +0200
Roland Jollivet wrote:
> I have come across a number of 24VAC traction motors from BT pallet
> lifters. About 4kW
>
> They use a controller that runs off a canBus. There is no encoder on the
> motor.
> These are not Servo drives as such, but can drive the motor
What did you want to discuss with the addf function?
I used it and think it works but what's more?
On Sun, 18 Nov 2018 21:47:12 -0500
Gene Heskett wrote:
> Greetings all;
>
> I expressed an interest in such a survey tool/utility 2 or 3 months back.
>
> Has there been any progress in writing
I did something similar two years ago. 32 bit value with 16 bits for encoder
style pulse counter and 16 bits for decimal is what I should chose. Position
values.
With encoder style I think of an encoder timer which usually overflow and then
number of overflows is counted for longer motion. This
> Not sure I follow what you are saying "by pin" but I think it is because
> they use a development system that abstracts some details. I know that I
> almost never use the low level registers to configure pins. One reason is
> to keep my code portable if I move to a different ARM chip.
Proble
> Then of course he is uses an $8,000 servo controller to hit those (x,y,z)
> points so no surprise the circle is spot-on perfect.
>
>
> I am always impressed when some one finds a way to do impossible things
> with no effort.
To pay someone else to do work is a simple method to do things withou
> On Saturday 28 October 2017 08:29:38 Nicklas SB Karlsson wrote:
>
> > > ...
> > >
> > > > It might be a good idea to turn by hand and check if load is same
> > > > in both direction. To run motor without load in both directions is
> >
> > Most LinuxCNC systems ar set up so the PC sends out things like PWM or
> > step/directin. These are VERY low level but with this setup, not the
> > communication is at a much higher level, even the home and limit
> > switches are detected by the controller.
>
> You would still need a low-late
> ...
> > It might be a good idea to turn by hand and check if load is same in
> > both direction. To run motor without load in both directions is also a
> > good idea.
>
> From the hand on the spindle test, or from the top of the tight drawbolt
> it turns with equal ease in both directions.
The
There is nothing available in ordinary linuxcnc development tree?
On Fri, 27 Oct 2017 11:07:59 +0200
theman whosoldtheworld wrote:
> I use the suggestion and indication from linuxcnc forum:
>
> https://forum.linuxcnc.org/24-hal-components/22346-ethercat-hal-driver
>
> about SOEM, The basic i
> Hardware for master is hard to find because you don't need it. Any normal
> Ethernet port works. Master is a software-only solution.
>
> You can choose a simple less redundant network topology. Double ring is
> used because it can tolerate failure and it's not more expensive then daisy
> ch
> Greetings everybody;
>
> Now that I have my G0704 back among the living, I've noted that the
> spindle pid has to show a bit of error, and reverse is still slower than
> fwd (about 25% slower) despite the fact that I have a .60 bias in fwd,
> and a .90 bias in reverse as friction helpers.
>
I have been thinking about FPGA for a communication switch, it would be
possible to get perfect timings. Then ordinary micro controllers could be used
for implementing the hardware, the approach is similar to the new devices with
so called Cortex-M-* PRUs but by using SPI, UART or maybe CAN it i
A circuit with a reasonable fast CPU, Ethernet and the FPGA for an arbitrary
number of communication ports, UART, SPI, CAN would probably be the ideal
device for a linuxcnc server.
I read fast and can't figure out the CPU on this chip.
On Sat, 14 Oct 2017 18:05:52 +0700
TJoseph Powderly wrote:
> > > > > > No SPI over long cable. For long cable RS422 will work, there
> > > > > > is a tradeoff between cable length and speed.
> > > > >
> > > > > Poor wording on my part. I had, once the terminations are
> > > > > sorted, visions of a 3 to 4 foot cable, defined as a long SPI
> > > > > cable.
> >>> I also have Yaskawa drives and motors but planned to replace drive.
> >>> Encoder is three quadrature signal which is a little bit odd, third
> >>> usually is zero. I have no time read are comment anything for a day or
> >>> two.
> >>>
> >>>
> >> I think the scheme (I had some of the old Y
On Sat, 29 Jul 2017 16:10:31 +
Tomaz T. wrote:
> I have air pressure switch to control if there is enough air pressure. Now I
> would like that this is also condition for enabling machine to run.
Emergency stop loop
--
Problem with the kinematics and it will move but not as expected?
On Fri, 28 Jul 2017 16:03:56 +0200
theman whosoldtheworld wrote:
> normally the first trouble is about your geometry and kins there are
> some different version of kins on web.
> The kinematic present in linuxcnc serves to s
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