I designed and built them for what I wanted. Another thing that was on
my mind was some one switching from Mach 3 to Machine Kit. The goal was
to lay the I\O similar to what you would have with 2 Parallel ports.
For the time I used it work, and I still may put it back into use with
the little Elks mini cnc sitting on the shelf.
The reason for the switch from MK to Linuxcnc, the Linuxcnc project just
has a better feel, IMHO, and the forum appears to have more members that
use it in a commercial setting. I'm not saying that the former statement
is gospel.
On 13/12/20 6:35 pm, John Dammeyer wrote:
The problem with the boards are that they are a little too general purpose. So
much more is needed above and beyond isolated outputs or inputs.
For example, say you want RS485 for the spindle controller. Or maybe CANopen
CAN bus for pick and place tools to bring in raw material and remove finished
goods. Even just a tool changer.
The Beagle has CAN bus and Serial ports along with I2C and SPI. These should
be configured so it's possible add an LCD display with touch screen. If they
make one of the CAN pins a switch input then the CAN port is lost. That's what
happened with the 4D Systems LCD cape I bought (now discontinued). Useless if
I also want a CAN cape.
A cape meant for CNC should know that LIMIT and ESTOP switches should be NC
type for safety. So no disabling outputs with the ESTOP signal.
A hardware PWM module on the Beagle should be an output. And ideally, with a
jumper, a PWM to 0-10V output or else STEP with the corresponding DIRECTION
signal.
Inputs tied to the AB and Index input of one of the quadrature encoder modules.
Ultimately what's more cost effective and saleable? A general purpose board
that still needs another BoB or a dedicated interface that would work with
_most_ mills or lathes.
IMHO the latter.
John
-----Original Message-----
From: Chris Albertson [mailto:albertson.ch...@gmail.com]
Sent: December-12-20 10:37 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Beaglebone and MachineKit
I just looked. That is a really nice way to design this. At first I
thought "Three boards? Why?" but this gives you some flexibility to change
out one board and also you have some packaging options too.
One thing I want to point out is that anyone here could have this PCB made
for 40 cents each and have a stack of them in hand before the start of
2021. However it might be worth a re-design using surface mount parts
because JLCPCB now offers to assemble SMT parts at no cost. They would
solder everything but the connectors and it would cost maybe $1 per PCB
total.
On Sat, Dec 12, 2020 at 9:44 PM Robert Murphy <robert.mur...@gmx.com> wrote:
I used a 3 board solution on my BBB before switching from MK to Linuxcnc.
https://github.com/ozzyrob/pp_cape
https://github.com/ozzyrob/pp_bob_input
https://github.com/ozzyrob/pp_bob_output
The cape attaches as normal and the 2 other boards sit either side
connected by a short ribbon cable.
Still have a few sets of boards left over, and one set of 3 fully built
that I used but no longer have a use for.
There are pretty basic but I found them to work without any issues.
On 13/12/20 7:18 am, Alan Condit wrote:
Marcus,
Jon Elson (Pico-systems) sells the Cramps board designed by Charles
Steinkuehler that can run six Pololu stepper drives (like 35v 1 to 2
amps).
I designed a little PCB that can plug into three of the stepper driver
sockets to allow it to control 3 external drives. They are or were
available on OSHPark as CRAMPS-BOB3-a3.
Alan
From: marcus.bow...@visible.eclipse.co.uk
To: EnhancedController <emc-users@lists.sourceforge.net>
Cc:
Bcc:
Date: Sat, 12 Dec 2020 19:38:12 +0000
Subject: [Emc-users] Beaglebone and MachineKit
John (or anyone else),
Is there a 'cape' currently available to suit the Beaglebone Black
running MachineKit or LinuxCNC?
I know there used to be a cape specifically for that purpose, but it has
been out of production for some time.
I have a Beaglebone I would like to press into service running either
LinuxCNC or MachineKit.
Are images available for both?
Marcus
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--
Chris Albertson
Redondo Beach, California
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