Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread gene heskett 

On 2/27/23 14:32, Sebastian Kuzminsky wrote:
The 7i90 in SPI mode works well with the Raspberry Pi 4, and probably 
the Pi 3 too.  (There's an issue with SPI on Pi on Debian Bookworm, but 
it works fine on Raspberry Pi OS Buster.)


Yes, it runs fine on a pi3b, but the pi3b is dragging its tongue on the 
floor, where the 4 core pi4b is right at home.


http://store.mesanet.com/index.php?route=product/product_id=291

6 available, for $60.

But that also needs a triplet of 7i42TA's and 3 very short 50 pin scsi 
style cables, the fpga is connected directly to the fpga, the 7i42TA are 
its overvoltage protecors/adapters to the 5 volt world. The 7i42TA's 
also supply the very convenient screw terminals to wire it to the 
machine, 10,000% easier to wire.



You have to flash one of the SPI firmwares on it, using mesaflash.


That needs a pc with a std parport, see the fine manual for how to go 
about reflashing it if an spi enabled bitfile is in it.





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, 1940)
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] Linux CNC on Pi3

2023-02-27 Thread gene heskett 

On 2/27/23 14:02, John Dammeyer wrote:

Two problems.
One: $249US and two: out of stock at the moment.

When I did my lathe, there was the 7i90HD but at $65, it has no 
protection for the fpga, its connected directly to the outputs.  And I 
learned 2 things.


1. 7i42TA's were needed between the 50 pin i/o connectors and the real 
world to protect the fpga from noise or even the normal 5 volts. 3 of 
those did the trick, but were about $130 added to the original $65, 
which I blew 3 of learning about #2


2. Single bolt grounding. Meaning ANYTHING grounded, is grounded by 
stacking its ground wires up on this single bolt. No other grounds 
allowed. This includes the third pin wire from the line cords static ground.


Without item 2 I had noise on everything reaching beyond the 100 Mhz 
bandwidth of my scope at the time, and peaking at over 100 volts peak to 
peak. No wonder I blew 3 cards.


With it rebuilt to satisfy #2, the measured noise dropped to about 200 
MILLIVOLTS!  That 3rd card is still in it, I just moved the blown 
circuits to another port.


The 7C80 sounds like all that, could do everything I'm doing with a 
7i90HD and 3 7i42TA's plus a spinx1 to control my vfd. With the general 
rise in costs since 6 years back, $249 seems like a good deal.  And I 
have about 30 i/o left over, way more than enough to run a tool changer 
like an emco. But I'm not actively looking for one.



Mind you, so is the 7i92H but it was around $89 and with two Chinese BoBs at $5 
each comes in much cheaper.

So then the question is both require waiting.  A Pi4 isn't cheap either nor in 
stock.


This I haven't tried to run LCNC on, but I bought a 4 pack of banana pi 
m5's with even more speed than the pi's, for $170, and they are running 
octoprint, one per printer in my printer farm just fine and as stable as 
my pi has been. One could probably recompile rpspi.ko to address the 
gpio used and it might be as simple as that. That same fix would likely 
make an orangepi work also since it uses the same broadcom gpio core as 
all the new "pi's".. The voron printers use a can bus to run the hot end 
running klipper to run the big voron's from an orange pi.


Food for thought. If Peter can supply the 7C80's in a reasonable time 
frame.  Peter?


And an ACORN CNC kit is $329.  Looks like in stock.
https://www.centroidcnc.com/centroid_diy/acorn_cnc_controller.html

It's hard to convince someone to go the CNC route with LinuxCNC when all they 
want is simple 3 or 4 axis with none of the other amazing features that 
LinuxCNC offers.

John


-Original Message-
From: andy pugh [mailto:bodge...@gmail.com]
Sent: February-27-23 10:32 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Linux CNC on Pi3

On Mon, 27 Feb 2023 at 18:15, John Dammeyer  wrote:


Ah.  I forgot about that little tidbit.


SPI (Such as 7C80) ought to work though.

--
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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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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>



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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread Sebastian Kuzminsky 
The 7i90 in SPI mode works well with the Raspberry Pi 4, and probably 
the Pi 3 too.  (There's an issue with SPI on Pi on Debian Bookworm, but 
it works fine on Raspberry Pi OS Buster.)


http://store.mesanet.com/index.php?route=product/product_id=291

6 available, for $60.

You have to flash one of the SPI firmwares on it, using mesaflash.


--
Sebastian Kuzminsky


On 2/27/23 12:01, John Dammeyer wrote:

Two problems.
One: $249US and two: out of stock at the moment.

Mind you, so is the 7i92H but it was around $89 and with two Chinese BoBs at $5 
each comes in much cheaper.

So then the question is both require waiting.  A Pi4 isn't cheap either nor in 
stock.

And an ACORN CNC kit is $329.  Looks like in stock.
https://www.centroidcnc.com/centroid_diy/acorn_cnc_controller.html

It's hard to convince someone to go the CNC route with LinuxCNC when all they 
want is simple 3 or 4 axis with none of the other amazing features that 
LinuxCNC offers.

John


-Original Message-
From: andy pugh [mailto:bodge...@gmail.com]
Sent: February-27-23 10:32 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Linux CNC on Pi3

On Mon, 27 Feb 2023 at 18:15, John Dammeyer  wrote:


Ah.  I forgot about that little tidbit.


SPI (Such as 7C80) ought to work though.

--
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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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread Sam Sokolik 
One thing to remember is that is a very basic acorn setup.  (With their cut
down control software). Plus you need a decent performing computer to run
the software..  so that needs to be considered..

Acorn is a good solution especially if you are familiar with the control
software.

On Mon, Feb 27, 2023, 1:07 PM John Dammeyer  wrote:

> Two problems.
> One: $249US and two: out of stock at the moment.
>
> Mind you, so is the 7i92H but it was around $89 and with two Chinese BoBs
> at $5 each comes in much cheaper.
>
> So then the question is both require waiting.  A Pi4 isn't cheap either
> nor in stock.
>
> And an ACORN CNC kit is $329.  Looks like in stock.
> https://www.centroidcnc.com/centroid_diy/acorn_cnc_controller.html
>
> It's hard to convince someone to go the CNC route with LinuxCNC when all
> they want is simple 3 or 4 axis with none of the other amazing features
> that LinuxCNC offers.
>
> John
>
> > -Original Message-
> > From: andy pugh [mailto:bodge...@gmail.com]
> > Sent: February-27-23 10:32 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Linux CNC on Pi3
> >
> > On Mon, 27 Feb 2023 at 18:15, John Dammeyer 
> wrote:
> > >
> > > Ah.  I forgot about that little tidbit.
> >
> > SPI (Such as 7C80) ought to work though.
> >
> > --
> > 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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> > https://lists.sourceforge.net/lists/listinfo/emc-users
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>
>
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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread John Dammeyer 
Two problems.
One: $249US and two: out of stock at the moment.

Mind you, so is the 7i92H but it was around $89 and with two Chinese BoBs at $5 
each comes in much cheaper.

So then the question is both require waiting.  A Pi4 isn't cheap either nor in 
stock.

And an ACORN CNC kit is $329.  Looks like in stock.
https://www.centroidcnc.com/centroid_diy/acorn_cnc_controller.html

It's hard to convince someone to go the CNC route with LinuxCNC when all they 
want is simple 3 or 4 axis with none of the other amazing features that 
LinuxCNC offers.

John

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: February-27-23 10:32 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Linux CNC on Pi3
> 
> On Mon, 27 Feb 2023 at 18:15, John Dammeyer  wrote:
> >
> > Ah.  I forgot about that little tidbit.
> 
> SPI (Such as 7C80) ought to work though.
> 
> --
> 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 mailing list
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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread andy pugh 
On Mon, 27 Feb 2023 at 18:15, John Dammeyer  wrote:
>
> Ah.  I forgot about that little tidbit.

SPI (Such as 7C80) ought to work though.

-- 
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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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread John Dammeyer 
Ah.  I forgot about that little tidbit.  
John

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: February-27-23 7:18 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Linux CNC on Pi3
> 
> On Sun, 26 Feb 2023 at 06:57, John Dammeyer  wrote:
> >
> > If I wanted to put LinuxCNC onto a Pi3 is there a distribution disk or a 
> > tutorial on how to do that starting
> with a stock raspian?
> 
> The stock LinuxCNC image might well work, but be aware that the reason
> we tend to suggest Pi4 is that the Pi4 has the ethernet on the PCI
> bus, not on the USB bus.
> 
> --
> 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 mailing list
> Emc-users@lists.sourceforge.net
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Re: [Emc-users] Linux CNC on Pi3

2023-02-27 Thread andy pugh 
On Sun, 26 Feb 2023 at 06:57, John Dammeyer  wrote:
>
> If I wanted to put LinuxCNC onto a Pi3 is there a distribution disk or a 
> tutorial on how to do that starting with a stock raspian?

The stock LinuxCNC image might well work, but be aware that the reason
we tend to suggest Pi4 is that the Pi4 has the ethernet on the PCI
bus, not on the USB bus.

-- 
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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