[Emc-users] Spindle control

[John Dammeyer]

I'm having a problem understanding how to control a spindle with step/dir 
rather than PWM.
 
>From what I've read on 
http://linuxcnc.org/docs/html/examples/spindle.html
 
essentially the spindle speed is a positive number and the M3 and M4 commands 
are connected to whatever pin(s) controls the direction of the spindle, if it 
can even change direction.
 
OTOH, from what I can see about the different axis like XY & Z is that the 
velocity request is signed.  And the stepgen takes the absolute value of that 
to set the step rate and the sign to set the direction.
 
What I can't figure out is how to translate that so that a stepgen running the 
spindle can control the direction.
 
Where the PWM direction is controlled by
 
# PWM dir pin config 
setp   hm2_7i92.0.gpio.005.is_output true
net spindle-ccw  =>  hm2_7i92.0.gpio.005.out
 
and the initial direction of a stepgen is handled with a positive or negative 
stepscale
 
This thread
https://forum.linuxcnc.org/24-hal-components/30638-how-to-change-motor-spin-directions
 
in a way addresses the problem but not with stepgen.
 
In my HAL file I have:
net spindle-ccw<=  motion.spindle-reverse
 
How would I use spindle-ccw to control the value of a stepgen direction?
 
Or would I somehow change the requested velocity to be +/- so the stepgen 
properly controls the direction output.
 
Is there an easy way?
Thanks 
John Dammeyer

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[John Dammeyer]

I'll put my two cents in here too.

First I had to buy a 3A 5V supply because the 2A kept making the lightning bolt 
show up at the top right corner of the screen.  Measured with a 6 digit meter 
it showed about 4.86V   So make sure you have a decent 5V supply.  I'd suggest 
at least 5A and not something cheap.  So now the price of the Pi goes up a bit.

I'm using the MESA 7i92H to a PMDX126 BoB.  I was using the C11 pin file for 
that since it matched the step pin2, dir pin3 model better than the PMDX one 
which had dir pin2 and step pin3. 

Since then I have modified the C11 VHDL file to shift a few things around, 
opened up pin 10 to be GPIO for the ESTOP which moves the encoder down 1 pin 
and now I can try a quadrature encoder on the spindle.Peter Wallace 
compiled the VHDL file for me and I just installed the .bit file and it works 
perfectly.

I've noticed that occasionally on start-up I get the warning message that the 
system may not be fast enough.  Not sure why.  I haven't run the latency test 
and keyed the results into the HAL or INI file so that may be why.  I'm also 
only running a 1GB Pi4 and I've read somewhere that LinuxCNC on the Pi prefers 
3GB so a 4GB Pi4 would be better.   Perhaps some sort of paging is going on 
during start-up that slows things enough to cause the message.   A friend has a 
4GB Pi4 coming in and he's got the same 7i92 so he might see the problem or he 
might not.  I also don't remember if I had WiFi enabled the last time I tried 
it and if that's also a reason for the delays.  Normally I don't like to have 
the shop machine the network.

As far as a PI4 being fast enough for an encoder one shouldn't care.  It's the 
FPGA on the MESA board that's counting that.  Not a parallel port or 3 GPIO 
pins on the Pi.

The Pi4 excels at display handling so I don't think that's a weak spot.  The SD 
card might be.  Absolutely fastest possible should be purchased.  All these 
things do start raising the price over a surplus PC.   Since the Pi4 has two 
USB 2.0 and two USB 3.0 there's usually enough for:
1. USB dongle for transferring G-Code
2. Keyboard
3. Mouse
4. Pendant.

And now you are out of space.  Some of the desktop PCs now come with about 7 
USB ports so add the price of a dangling dongle USB hub.  Best it be USB 3.0

I think the Pi4 4GB with a MESA Ethernet connection will be ideal and all the 
stuff including the BoB and power supply will fit into a smaller box than a 
desktop PC.  So if a compact footprint is the goal it's not a bad idea.  

But be aware you are at the front end of the experience curve here.  Most 
people are still just experimenting with it as a CNC controller.  I have no 
idea how many out there are now in a box, the lid or door closed and just being 
used to CNC parts without thought that it's a Pi doing the work.

For the price of a Pi4 which can be repurposed (I'm using a Pi2 on my Octopi 3D 
printer) and a decent power supply (never a waste of money) you can play for a 
while and if you aren't happy put in the big 64 bit  PC.

My two cents.  And in Canada we don't use pennies anymore so for what it's 
worth.
John


> -Original Message-
> From: Leonardo Marsaglia [mailto:ldmarsag...@gmail.com]
> Sent: June-12-21 4:25 PM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Question about Raspberry Pi 4 reliability
> 
> Hello guys,
> 
> As  some of you know, I'm finishing a CNC router and I'm about to purchase
> all the control hardware. I know Gene, John, and several people here are
> running LCNC on the PI with success but I would like to know how much of a
> pain in the ass is to get it running well with a 7i76E for controlling the
> router.
> 
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
> been doing with all the other machines. I really like the idea of using
> something as portable and small as the Rpi but I don't want to purchase one
> just to test right now... I do have a Rpi3 with Octoprint on the ender but
> I don't know if that's a good candidate to test LCNC.
> 
> What do you guys think?
> 
> Thanks as always and I hope you're all doing well :)
> 
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Gene Heskett]

On Saturday 12 June 2021 19:24:49 Leonardo Marsaglia wrote:

> Hello guys,
>
> As  some of you know, I'm finishing a CNC router and I'm about to
> purchase all the control hardware. I know Gene, John, and several
> people here are running LCNC on the PI with success but I would like
> to know how much of a pain in the ass is to get it running well with a
> 7i76E for controlling the router.
>
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as
> I've been doing with all the other machines. I really like the idea of
> using something as portable and small as the Rpi but I don't want to
> purchase one just to test right now... I do have a Rpi3 with Octoprint
> on the ender but I don't know if that's a good candidate to test LCNC.

I may be the first, or nearly so, to use a pi to run LCNC. Ethernet 
interfaces didn't seem to fill the bill because I wanted to use the only 
hardware ethernet it had as a normal network connection, so the 
interface chosen at the time was the 7i90HD which could be driven by a 
parport, or by SPI.  Since the pi didn't then have a parport, it was 
SPI.

I don't use the radio, but thats a different story/subject.

But LCNC didn't have an SPI interface, so a swedish prof wrote rpspi.ko 
and gave it to us. The pi3 could run my lathe rather nicely, but it did 
keep it pretty busy, so when I wrote the hal stuff to add two more 
encoder dials so I could drive it by hand too, and given that the dials 
were only 100 ppr, I added a 200hz thread to hal and put all that stuff 
in it.

But first I had to build a quasi-realtime kernel, which presented me with 
a problem, the pi folks would not help me install it. So I grabbed what 
the pi needed. organized it in a tarball, that if unpacked to a u-sd 
card with raspbian already installed, put everything the pi needed to 
run this kernel:

 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Feb 6 07:09:18 EST 2020 armv7l

Which is all in one slightly less than 30 megabyte tarball.  Its not 
perfect, but plenty close enough for me until I tried to cut some lathe 
pawns out of air while browseing the evening news with firefox on the 
rpi3. I could hear a stutter now and then.

That started out with a raspian jessie install, then stretch and now the 
same kernel is running raspian buster on a 2 gig pi4. Still booting from 
the u-sd card, but with the pi4, its not dragging its tongue at all, I 
can browse the net while cutting pawns out of air & never hear a single 
stutter from the steppers.

I have a 240G SSD on a usb3 cable adapter, moved as much of the stuff as 
I could off the u-sd to another 120G SSD on the other usb3 port, and am 
building master or master-gtk3 at least daily and installing it, on that 
same u-sd card, for over a year now. I check github for fresh commits 4x 
a day so I'm tracking the buildbot with maybe a days lag maximum.

The only thing I spent extra money on was a trio of 7i42TA's to protect 
and buffer the 7i90's 3 volt gpio stuff, I had some noise get backed 
into the 7i90 and blew some pins on the first 3 7i90's. I redid all the 
grounds onto one BIG star setup, which got rid of the noise at the same 
time I added the 7i42TA's, whose terminals made the interfaceing enough 
easier that I don't regret the cost.

And I recently changed the motors driving that 75 yo Sheldon, for 3 phase 
stepper driven servo's. Much quieter, moves like Casper the ghost now, 
and twice as fast. These have a fault output that I use to kill motion 
as instantly as it can get stopped. Has not tripped while doing a job, 
but I can position it to hit a chuck jaw at cutting speed, and jog it 
into the jaw without damaging the chip in the tool, or making a mark on 
the jaw, so I'd guess its working as intended.

My $0.02.

> What do you guys think?
>
> Thanks as always and I hope you're all doing well :)
>
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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] Question about Raspberry Pi 4 reliability

[Leonardo Marsaglia]

Well, the portability is not a must, but the idea of having all the major
hardware as compact as possible really tempts me to at least consider the
idea. For the other machines I used mini ATX with one PCI express port to
accommodate the Mesa board. For this project I'm inclined to use an
Ethernet card just to simplify the hardware mounting on the cabinet. And
since the Rpi 4 is growing in popularity here, I just needed to ask to see
if it's worth the try.

With octoprint the Rpi 3 is working flawlessly really, although that
doesn't have to do what LCNC has to do, and also I'm not even using the GUI.

El sáb, 12 jun 2021 a las 20:58, Chris Albertson ()
escribió:

> Why does the control computer need to be portable, unless you are building
> a portable router and want the whole machine to be easy to move?
>
> As for Octoprint, I use a standard PC (an older i5 with about 8 GB RAM.) f
>  In fact, the very same PC runs both LinuxCNC and Octoprint at the same
> time just fine without coming close to using all the available CPU.  RT
> Linux makes sure the bits of EMC that need to run in the real-time run in
> real-time   Even with streaming video and a remote log-in, the PC is not
> half loaded and neither is the gigabit Ethernet.  PCs are so much more
> powerful then RPI.
>
> I use the Pi4 for mobile robots that need to run on battery power but I
> don't see the point with AC mains power is available.
>
> On Sat, Jun 12, 2021 at 4:28 PM Leonardo Marsaglia 
> wrote:
>
> > Hello guys,
> >
> > As  some of you know, I'm finishing a CNC router and I'm about to
> purchase
> > all the control hardware. I know Gene, John, and several people here are
> > running LCNC on the PI with success but I would like to know how much of
> a
> > pain in the ass is to get it running well with a 7i76E for controlling
> the
> > router.
> >
> > I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as
> I've
> > been doing with all the other machines. I really like the idea of using
> > something as portable and small as the Rpi but I don't want to purchase
> one
> > just to test right now... I do have a Rpi3 with Octoprint on the ender
> but
> > I don't know if that's a good candidate to test LCNC.
> >
> > What do you guys think?
> >
> > Thanks as always and I hope you're all doing well :)
> >
> > ___
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> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Chris Albertson]

Why does the control computer need to be portable, unless you are building
a portable router and want the whole machine to be easy to move?

As for Octoprint, I use a standard PC (an older i5 with about 8 GB RAM.) f
 In fact, the very same PC runs both LinuxCNC and Octoprint at the same
time just fine without coming close to using all the available CPU.  RT
Linux makes sure the bits of EMC that need to run in the real-time run in
real-time   Even with streaming video and a remote log-in, the PC is not
half loaded and neither is the gigabit Ethernet.  PCs are so much more
powerful then RPI.

I use the Pi4 for mobile robots that need to run on battery power but I
don't see the point with AC mains power is available.

On Sat, Jun 12, 2021 at 4:28 PM Leonardo Marsaglia 
wrote:

> Hello guys,
>
> As  some of you know, I'm finishing a CNC router and I'm about to purchase
> all the control hardware. I know Gene, John, and several people here are
> running LCNC on the PI with success but I would like to know how much of a
> pain in the ass is to get it running well with a 7i76E for controlling the
> router.
>
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
> been doing with all the other machines. I really like the idea of using
> something as portable and small as the Rpi but I don't want to purchase one
> just to test right now... I do have a Rpi3 with Octoprint on the ender but
> I don't know if that's a good candidate to test LCNC.
>
> What do you guys think?
>
> Thanks as always and I hope you're all doing well :)
>
> ___
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>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[R C]

I have several RPI3's and RPI4's.  what I noticed (with the RPI4)  more 
memory is always better.


There are  things they are good at, especially "light-weight" stuff, and 
other things they are not.   I use one as a datalogger, I tried RPI3 
RPI4-1GB/4GB/8GB, and it has timing and temperature issues.


(I am not using them for CNC).  I use aa RPI as a datalogger for a 
seismograph, that seems to be pushing it,  I use one for home 
automation, like switching off/on lights (which is not time critical), I 
use it for reading humidity/temp data, also fine because there are no 
timing critical things with that either. (I don't care if the lights go 
on/off a half second sooner or later)


they are pretty powerful little ARM computer/boards..  BUT  it is a 
$40-$80 piece of equipment... you get what you pay for.


I run CNClinux on a Dell, 172GB, dual cpu, 24 cores, I don't think an 
RPI can match that. an RPI might be able to run a CNC machine..  but if 
I'd do it, I'd do it for "funsies" to see if I can get away with it and 
make a point.


(I've been known to do things like that, just to see if I can get away 
with things.)


For example ..  what an RPI is not good at... is reliably read a 
quadrature encoder output, and I know some use these encoders.




but that's just my 2cts.


Ron



On 6/12/21 5:24 PM, Leonardo Marsaglia wrote:

Hello guys,

As  some of you know, I'm finishing a CNC router and I'm about to purchase
all the control hardware. I know Gene, John, and several people here are
running LCNC on the PI with success but I would like to know how much of a
pain in the ass is to get it running well with a 7i76E for controlling the
router.

I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
been doing with all the other machines. I really like the idea of using
something as portable and small as the Rpi but I don't want to purchase one
just to test right now... I do have a Rpi3 with Octoprint on the ender but
I don't know if that's a good candidate to test LCNC.

What do you guys think?

Thanks as always and I hope you're all doing well :)

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Re: [Emc-users] OT: About a chat here on vacuum table ideas

[Leonardo Marsaglia]

Hello all and thanks again for all the feedback,

Well, to clarify a little bit more this is what I have and I what I intend
to do:

I'm planning to use the router to cut just sheets of MDF and Melamine with
compression toolbits mostly, and some drilling too, all carbide off course.
I do have a 3 hp side blower that was used to suck wood chips from another
machine. My idea was to start with that pump to see if it can handle the
task. I can't try all this already because the router is almost finished
but not yet. But since it's almost the end of the project I think this is
the moment to start worrying about the bed subject.

So basically, I will have to try the MDF spoil board without holes to see
if that works and if not, just try another material not so permeable with
the pellets and springs. I have several weeks yet to decide what to do.

Best wishes to all!

El jue, 10 jun 2021 a las 10:28, Les Newell ()
escribió:

> That's very good info. If you are doing mass production and starting
> with blanks or pre-machined parts then pods are the way to go, no doubt.
> However if you are machining parts out of sheet then you want vacuum on
> the whole table. Table vacuum is generally more versatile but usually
> needs some creativity when it comes to holding smaller parts.
>
> I see a few suggestions to skim your spoil board to improve flow. In my
> personal opinion that is not always a good thing. The higher the
> permeability of the board the more flow you get in exposed areas. Flow
> rate and pressure drop are directly related. If you decrease the flow
> rate the pressure drop across the board decreases.
> Take two areas of the board, one is covered with an impermeable object
> and the other is open. The open area has no limit to the available air
> so the pressure drop across the board is high and the flow rate is high.
> However in the case of the covered area, little or no air flows through
> the covering so there is very little pressure drop across the board.
> Your part sees nearly the full vacuum.
> If you  are cutting impermeable materials such as plastics or alubond
> you want a very restrictive spoil board to reduce lost vacuum in the cut
> areas. If you are cutting permeable materials such as MDF you need less
> restriction in the spoil board to compensate for the flow through your
> work. It's a complicated subject and the only real solution is to
> experiment and see what works for your setup.
>
> Les
>
> On 09/06/2021 21:00, Todd Zuercher wrote:
> > There is a wide discrepancy between the levels of vacuum that different
> types of vacuum pumps and blowers can generate.  Some kinds are rotary
> screw pumps, liquid ring pumps, rotary vane pumps, positive displacement
> blowers like a roots blower, or regenerative blowers (which are more like a
> fan).  You need to consider both the level of vacuum you need to attain and
> the amount of air you need to move to get there.  Compare a 10HP regen
> blower, vs a 10HP rotary vane pump.  The regen blower can move 4 times as
> much air as the positive displacement vane pump.  But the vain pump can
> draw more than twice the vacuum level.  Which would hold a part better will
> depend a lot on table design and area.  An open hole table with small
> pockets over the holes can work very well with the blower, but the blower
> will struggle trying to hold small parts on a fall board.  The vane pump
> would work great on closed pods and jigs or a smaller fall board, but if
> the table is very large or an open flow design it won't be able to keep up
> and vacuum levels could fall too low.
> >
> > A 5ft x 10ft fall board (sheet of MDF that has been skinned can flow
> nearly 300acfm (maybe a bit more) of air when a 15inHg vaccum is applied to
> it.  But if you need 20inHg to hold your parts, you're going to need a much
> larger and more powerful pump to get there (probably at least double).  But
> if you only need 10inHG the flow through the board will be much less
> probably closer to 100ACFM.  The greater the pressure differential the
> higher the flow and leakage.  This is why gasketed jigs and pods work so
> much better for holding pieces.  You don't have the flow to contend with,
> you only need a pump capable of generating the pressure level you need and
> the ACFMs of the pump are less important.
> >
> > Todd Zuercher
> > P. Graham Dunn Inc.
> > 630 Henry Street
> > Dalton, Ohio 44618
> > Phone:  (330)828-2105ext. 2031
>
>
>
>
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[Emc-users] Question about Raspberry Pi 4 reliability

[Leonardo Marsaglia]

Hello guys,

As  some of you know, I'm finishing a CNC router and I'm about to purchase
all the control hardware. I know Gene, John, and several people here are
running LCNC on the PI with success but I would like to know how much of a
pain in the ass is to get it running well with a 7i76E for controlling the
router.

I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
been doing with all the other machines. I really like the idea of using
something as portable and small as the Rpi but I don't want to purchase one
just to test right now... I do have a Rpi3 with Octoprint on the ender but
I don't know if that's a good candidate to test LCNC.

What do you guys think?

Thanks as always and I hope you're all doing well :)

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[Emc-users] Carousel. ordinary encoder as sensor

[Nicklas SB Karlsson]

My carousel have an ordinary encoder used to sense angle of carousel 
wheel with an index impulse. A digital output signal rotate carousel, 
index pulse must occur before sensed value is valid and have to wait 
until a given position depending on selected tool to turn off rotation 
of carousel.


Do not find any modulo arithmetic in hal, it is very useful then waiting 
for a particular angle both if value overflow or just accumulate. May be 
solved by loop and modulo operator in g-code but maybe adding to 
carousel component would be a better option.


Anyono else here are using a similar angle?


Nicklas Karlsson



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Re: [Emc-users] BeagleBoneBlack

[John Dammeyer]

Hi Rob,
I've used my ELS for all sorts of non-ELS projects.  Especially since the 
original had a 3A 55V micro stepping driver on board.  Or it could drive 
external motors.  For the longest time it was the power feed for the knee on 
the mill driving a Gecko and a 1000 oz-in motor with 3:1 reduction.

I've also used it as a rotary table controller.  Once you set up the distance 
per single step jog it's easy to mount something in the table and each jog 
moves to the next drill position.  Beats the arms and pin of a standard rotary 
indexer.

Oh and then a coil winder.  Tell it to cut a thread  a certain length and the 
stepper motor turns a repeatable number of turns.  Bingo.  N windings on the 
coil form.

And of course as the Z axis controller on my South Bend for threading and 
boring to a repeatable stop.

I've done a few things to 'enhance' my ELS.  First I ported the code which was 
incredibly easy to a PIC32 from the PIC18.   The time spent inside the 
interrupt routine which includes the micro-stepping control went from just over 
35uS to about 3uS.I wasn't able to plug in the PIC32 that I wanted into the 
Automotive Networking Board I used for development but a full quadrature 
encoder will now be possible instead of a single pulse per rev.  I can send you 
some pictures off list if you want.  The plan was to make a small piggy back 
board that plugged into the 40 pin DIP socket of the PIC18F.  But with the 
power of the PIC32 and a second DB-25.

But I also got side tracked from that with a TI dual processor and floating 
point math units; the F2837xD.  
https://www.ti.com/lit/ds/symlink/tms320f28378d.pdf

I was just at the point where I was looking at wiring it up as a replacement 
for the ELS when work-work got in the way.  Since then it's sitting at the back 
of the bench and other projects involving the Beagle surfaced again.   I almost 
have a CANopen stack written for it too.  One could spend years just playing 
with it.  Now I've forgot most of what I was doing with it.

The pocket beagle also looks interesting.  

Too many projects.  Not enough time.

John



> -Original Message-
> From: Robert Murphy [mailto:robert.mur...@gmx.com]
> Sent: June-12-21 12:30 AM
> To: Emc-users@lists.sourceforge.net
> Subject: [Emc-users] BeagleBoneBlack
> 
> 
> Hi John,
> 
> With regards to the BBB I was running MK (wheezy) on using the PRU,
> which for my needs seemed to be ok, I didn't notice any graphics issues.
> 
> The thing that turns me off MK is how it's split and so forth.
> 
> The reason my interest has piqued is because I have a project on the go
> that the BBB would be perfect for. I have a mini table saw that I'm
> setting up to cut PCB sleepers for a model railway I'm building. Each
> sleeper requires a few cuts, for very precise ones just enough to cut
> through the copper.
> 
> What I was thinking of is a simple GUI control the position of the
> fence, and hooking a ESP32 (via ethernet) to do the motion
> control.There is a discussion on the forum regarding this. The code
> is very experimental the moment but I think it could just work.
> 
> Currently the Mill is controlled by a MESA 7i92 connected to 7i76, 7i73
> and a few other cards. This is all hooked up to a Odroid H2 plus.
> 
> If the BBB isn't a viable solution I have a x86 based Atom Pi and a
> RPi400, so a couple of options.
> 
> The ELS sounds interesting having just built a "parts bin special", a
> Myford ML7 bed (the bed is almost unworn) and a Super7 head stock (no
> back gear, but the vfd should help) and various other S7 & ML7 parts
> (complete ones are at stupid prices Down Under and many are rusted and
> incomplete). So I guess adding a few steppers and ballscrews shouldn't
> be too much of an issue.
> 
> 
> Cheers
> 
> Rob
> 
> 
> 
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Re: [Emc-users] BeagleBoneBlack

[andrew beck]

Robert.

Just saw you are Down under.  Are you in aus or nz?

On Sat, Jun 12, 2021, 7:32 PM Robert Murphy  wrote:

>
> Hi John,
>
> With regards to the BBB I was running MK (wheezy) on using the PRU,
> which for my needs seemed to be ok, I didn't notice any graphics issues.
>
> The thing that turns me off MK is how it's split and so forth.
>
> The reason my interest has piqued is because I have a project on the go
> that the BBB would be perfect for. I have a mini table saw that I'm
> setting up to cut PCB sleepers for a model railway I'm building. Each
> sleeper requires a few cuts, for very precise ones just enough to cut
> through the copper.
>
> What I was thinking of is a simple GUI control the position of the
> fence, and hooking a ESP32 (via ethernet) to do the motion
> control.There is a discussion on the forum regarding this. The code
> is very experimental the moment but I think it could just work.
>
> Currently the Mill is controlled by a MESA 7i92 connected to 7i76, 7i73
> and a few other cards. This is all hooked up to a Odroid H2 plus.
>
> If the BBB isn't a viable solution I have a x86 based Atom Pi and a
> RPi400, so a couple of options.
>
> The ELS sounds interesting having just built a "parts bin special", a
> Myford ML7 bed (the bed is almost unworn) and a Super7 head stock (no
> back gear, but the vfd should help) and various other S7 & ML7 parts
> (complete ones are at stupid prices Down Under and many are rusted and
> incomplete). So I guess adding a few steppers and ballscrews shouldn't
> be too much of an issue.
>
>
> Cheers
>
> Rob
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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[Emc-users] BeagleBoneBlack

[Robert Murphy]

Hi John,

With regards to the BBB I was running MK (wheezy) on using the PRU,
which for my needs seemed to be ok, I didn't notice any graphics issues.

The thing that turns me off MK is how it's split and so forth.

The reason my interest has piqued is because I have a project on the go
that the BBB would be perfect for. I have a mini table saw that I'm
setting up to cut PCB sleepers for a model railway I'm building. Each
sleeper requires a few cuts, for very precise ones just enough to cut
through the copper.

What I was thinking of is a simple GUI control the position of the
fence, and hooking a ESP32 (via ethernet) to do the motion
control.There is a discussion on the forum regarding this. The code
is very experimental the moment but I think it could just work.

Currently the Mill is controlled by a MESA 7i92 connected to 7i76, 7i73
and a few other cards. This is all hooked up to a Odroid H2 plus.

If the BBB isn't a viable solution I have a x86 based Atom Pi and a
RPi400, so a couple of options.

The ELS sounds interesting having just built a "parts bin special", a
Myford ML7 bed (the bed is almost unworn) and a Super7 head stock (no
back gear, but the vfd should help) and various other S7 & ML7 parts
(complete ones are at stupid prices Down Under and many are rusted and
incomplete). So I guess adding a few steppers and ballscrews shouldn't
be too much of an issue.


Cheers

Rob



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